Image Trace: thin lines in blurred and scanned art keep smooth edges

Black and White read every pixel as a blend of "black" and "white", and took for those the mean luminance of the image's black and white pixels. In blurred or scanned line art most black pixels are part paper, so the mean black was a gray: the middle of every line counted as more than all ink, and by how much changed as the line crossed the pixel rows, which put a ripple on its edges that the fit then followed with anchors. - Black is the image's darkest black (the 2nd percentile of its black pixels' luminance). - White is the lightest pixel within a few pixels of each crack: the paper as it is there. A scan's paper is darker in one corner than in another, and read against the image's lightest white it counted as part ink. On each preset's own inputs, all sizes and variants (docs/image-trace-quality.md), before -> after: - Line Art: 78 -> 46 anchors, outlines 0.093 -> 0.055 px off on average (blurred lines 168 -> 53 anchors, scanned 199 -> 70); before sub-pixel edges it was 25 anchors and 0.158 px off - Technical Drawing: 56 -> 46 anchors, 0.092 -> 0.084 px off - Sketched Art: 0.197 -> 0.186 px off; Default 0.092 -> 0.090; Black and White Logo 0.063 -> 0.059 with 27 -> 29 anchors Not kept: reading lines up to six pixels deep by their ink's centroid and width, and a looser tolerance for straight runs, neither of which measured better.
Merge pull request #1548 from storytold/fix/1529-fontconfig-dirs
2026-10-13 07:27:56 +07:00 · 2026-10-13 07:14:31 +07:00 · 2026-10-13 07:14:14 +07:00 · 2026-10-13 07:14:01 +07:00 · 2026-10-13 07:13:45 +07:00 · 2026-10-13 07:13:29 +07:00
4 changed files with 274 additions and 178 deletions
@@ -51,7 +51,8 @@ fn step(d: u8) -> (i32, i32) {
 fn label(mask: &[bool], w: usize, h: usize) -> (Vec<u32>, Vec<usize>) {
    let mut comp = vec![u32::MAX; w * h];
    let mut sizes = Vec::new();
-    let mut stack = Vec::new();
+    // (Indices as `u32`: a mask has at most 64 million pixels, and this stack can hold them all.)
+    let mut stack: Vec<u32> = Vec::new();
    for s in 0..w * h {
        if !mask[s] || comp[s] != u32::MAX {
            continue;
@@ -59,14 +60,15 @@ fn label(mask: &[bool], w: usize, h: usize) -> (Vec<u32>, Vec<usize>) {
        let id = sizes.len() as u32;
        let mut n = 0usize;
        comp[s] = id;
-        stack.push(s);
+        stack.push(s as u32);
        while let Some(i) = stack.pop() {
+            let i = i as usize;
            n += 1;
            let (x, y) = (i % w, i / w);
            let mut go = |j: usize| {
                if mask[j] && comp[j] == u32::MAX {
                    comp[j] = id;
-                    stack.push(j);
+                    stack.push(j as u32);
                }
            };
            if x > 0 {
@@ -469,11 +469,14 @@ pub fn trace_within(img: &Raster, params: &TraceParams, max_anchors: usize) -> R
    let img = smoothed.as_ref().unwrap_or(img);
    let mut q = quantize(img, params);
    denoise(&mut q.labels, w, h, params.noise as usize);
-    // Pixel count per palette entry.
+    // Pixel count per palette entry, and the box its pixels lie in.
    let mut counts = vec![0usize; q.palette.len()];
-    for &l in &q.labels {
-        if let Some(c) = counts.get_mut(l as usize) {
+    let mut boxes: Vec<Option<(usize, usize, usize, usize)>> = vec![None; q.palette.len()];
+    for (i, &l) in q.labels.iter().enumerate() {
+        if let (Some(c), Some(b)) = (counts.get_mut(l as usize), boxes.get_mut(l as usize)) {
            *c += 1;
+            let (x, y) = (i % w, i / w);
+            *b = Some(b.map_or((x, y, x + 1, y + 1), |b| (b.0.min(x), b.1.min(y), b.2.max(x + 1), b.3.max(y + 1))));
        }
    }
    // Layers bottom → top: largest area first.
@@ -503,6 +506,7 @@ pub fn trace_within(img: &Raster, params: &TraceParams, max_anchors: usize) -> R
        rank: &rank,
        params,
        img,
+        boxes,
        bw_tones: bw_tones(img, &q),
        style: params.outline_style(),
        opts: fit::FitOptions {
@@ -517,7 +521,12 @@ pub fn trace_within(img: &Raster, params: &TraceParams, max_anchors: usize) -> R
        max_anchors,
    };
    let mut out = TraceResult::default();
-    for (paths, &(_, ci)) in parallel_map(&layers, |&(r, ci)| job.layer(r, ci)).into_iter().zip(&layers) {
+    // A layer takes about ten bytes a pixel of its box while it is traced (its mask, the labels
+    // of its components, the stack that fills them, its edges): as many layers at a time as fit
+    // in half a gigabyte, so that a large image is not traced at the cost of gigabytes.
+    let largest = job.boxes.iter().flatten().map(|b| (b.2 - b.0) * (b.3 - b.1)).max().unwrap_or(1).max(1);
+    let at_a_time = ((512 << 20) / (largest * 10)).max(1);
+    for (paths, &(_, ci)) in parallel_map_at_most(at_a_time, &layers, |&(r, ci)| job.layer(r, ci)).into_iter().zip(&layers) {
        out.paths.extend(paths.ok_or(TraceError::TooComplex { max: max_anchors })?);
        let color = q.palette[ci];
        if !out.palette.contains(&color) {
@@ -527,17 +536,32 @@ pub fn trace_within(img: &Raster, params: &TraceParams, max_anchors: usize) -> R
    Ok(out)
 }

-/// The mean luminance of the pixels labelled 0 (white) and 1 (black) of a Black and White
-/// quantisation: pure white and black where a side has no pixel.
+/// The luminance of white and of black in a Black and White quantisation: what its lightest
+/// white pixels and its darkest black ones have (the 98th and 2nd percentiles; pure white and
+/// black where a side has no pixel). Not the means: where the black is thin lines, blurred or
+/// scanned, most black pixels are part paper, their mean is a gray, and read against it the middle
+/// of every line would count as more than all ink, now more and now less as the line crosses the
+/// pixel rows, which put a ripple on its edges.
 fn bw_tones(img: &Raster, q: &Quantized) -> [f64; 2] {
-    let (mut sum, mut n) = ([0.0f64; 2], [0.0f64; 2]);
+    let mut hist = [[0u64; 256]; 2];
    for (p, &l) in img.rgba.as_chunks::<4>().0.iter().zip(&q.labels) {
-        if let (Some(s), Some(n)) = (sum.get_mut(l as usize), n.get_mut(l as usize)) {
-            *s += (f64::from(p[0]) * 299.0 + f64::from(p[1]) * 587.0 + f64::from(p[2]) * 114.0) / 1000.0;
-            *n += 1.0;
+        if let Some(h) = hist.get_mut(l as usize) {
+            h[((u32::from(p[0]) * 299 + u32::from(p[1]) * 587 + u32::from(p[2]) * 114 + 500) / 1000).min(255) as usize] += 1;
        }
    }
-    [if n[0] > 0.0 { sum[0] / n[0] } else { 255.0 }, if n[1] > 0.0 { sum[1] / n[1] } else { 0.0 }]
+    // The luminance a share `at` of the side's pixels are darker than.
+    let percentile = |h: &[u64; 256], at: f64, none: f64| {
+        let total: u64 = h.iter().sum();
+        let mut seen = 0;
+        for (v, n) in h.iter().enumerate() {
+            seen += n;
+            if total > 0 && seen as f64 >= at * total as f64 {
+                return v as f64;
+            }
+        }
+        none
+    };
+    [percentile(&hist[0], 0.98, 255.0), percentile(&hist[1], 0.02, 0.0)]
 }

 /// What tracing one colour layer needs.
@@ -547,7 +571,9 @@ struct Layers<'a> {
    rank: &'a [usize],
    params: &'a TraceParams,
    img: &'a Raster,
-    /// Black and White: the mean luminance of the white pixels and of the black ones.
+    /// The box each palette entry's pixels lie in: `(x0, y0, x1, y1)`, the far sides excluded.
+    boxes: Vec<Option<(usize, usize, usize, usize)>>,
+    /// Black and White: the luminance of white and of black (see `bw_tones`).
    bw_tones: [f64; 2],
    /// How outlines are fitted.
    style: logo::Style,
@@ -609,7 +635,7 @@ impl Layers<'_> {
    /// How far the edge lies from a crack between two pixels, towards the outside one (−0.5 to 0.5).
    ///
    /// Each pixel of the column across the crack is read as a blend of the tones on its two sides
-    /// (the two pixels' palette colours; in Black and White the mean luminance of the black and of
+    /// (the two pixels' palette colours; in Black and White the luminance of the image's black and of
    /// the white pixels). The edge is where the blends, summed, put it: as far out as there is
    /// inside tone in the outside pixels, less the outside tone in the inside ones (two pixels each
    /// way, while they are on the same side and no more blended than the pixel before: more would be
@@ -630,8 +656,20 @@ impl Layers<'_> {
            return 0.0;
        }
        let bw = self.params.mode == Mode::BlackAndWhite;
+        // Black and White: black is the image's black; white is the lightest pixel within a few
+        // pixels of the crack, the paper as it is here (a scan's paper is darker in one corner than
+        // in another, and read against the image's lightest white it would count as part ink).
+        let black = self.bw_tones[1];
+        let white = if bw {
+            let light = (-3..=4)
+                .filter_map(|k| c.at(k).and_then(|i| self.img.rgba.get(i * 4..i * 4 + 3)))
+                .map(|p| (f64::from(p[0]) * 299.0 + f64::from(p[1]) * 587.0 + f64::from(p[2]) * 114.0) / 1000.0);
+            light.fold(f64::NEG_INFINITY, f64::max).clamp((black + 32.0).min(self.bw_tones[0]), self.bw_tones[0])
+        } else {
+            self.bw_tones[0]
+        };
        let (ca, cb) = if bw {
-            let tone = |l: u16| [self.bw_tones[usize::from(l == 1)]; 3];
+            let tone = |l: u16| [if l == 1 { black } else { white }; 3];
            (tone(la), tone(lb))
        } else {
            let (Some(ca), Some(cb)) = (self.q.palette.get(la as usize), self.q.palette.get(lb as usize)) else { return 0.0 };
@@ -689,7 +727,6 @@ impl Layers<'_> {
        };
        if bw {
            // The share of black at which a pixel turns black.
-            let (white, black) = (self.bw_tones[0], self.bw_tones[1]);
            let turn = ((white - f64::from(self.params.threshold)) / (white - black).max(1.0)).clamp(0.02, 0.98);
            shift += if la == 1 { 1.0 } else { -1.0 } * (0.5 - turn) / steep;
        }
@@ -709,17 +746,23 @@ impl Layers<'_> {
        } else {
            (vec![], vec![])
        };
-        let mask: Vec<bool> = self
-            .q
-            .labels
-            .iter()
-            .enumerate()
-            .map(|(i, &l)| {
-                l != TRANSPARENT
-                    && !thin.get(i).copied().unwrap_or(false)
-                    && if overlapping { self.rank.get(l as usize).is_some_and(|&lr| lr >= r) && !self.ignored(l) } else { l as usize == ci }
-            })
-            .collect();
+        // The layer is traced within the box its pixels lie in, not the whole image.
+        let part = |l: u16| if overlapping { self.rank.get(l as usize).is_some_and(|&lr| lr >= r) && !self.ignored(l) } else { l as usize == ci };
+        let (mut x0, mut y0, mut x1, mut y1) = (w, h, 0, 0);
+        for (l, b) in self.boxes.iter().enumerate() {
+            if let Some(b) = b.filter(|_| part(l as u16)) {
+                (x0, y0, x1, y1) = (x0.min(b.0), y0.min(b.1), x1.max(b.2), y1.max(b.3));
+            }
+        }
+        if x0 >= x1 || y0 >= y1 {
+            return Some(vec![]);
+        }
+        let (bw, bh) = (x1 - x0, y1 - y0);
+        let mut mask = Vec::with_capacity(bw * bh);
+        for y in y0..y1 {
+            let row = self.q.labels.get(y * w + x0..y * w + x1)?;
+            mask.extend(row.iter().enumerate().map(|(k, &l)| l != TRANSPARENT && !thin.get(y * w + x0 + k).copied().unwrap_or(false) && part(l)));
+        }
        // Without Fills, areas are outlined with a 1 px stroke.
        let area_stroke = (params.strokes && !params.fills).then_some(1.0);
        let min_hole = params.noise.max(1) as i64;
@@ -732,7 +775,16 @@ impl Layers<'_> {
            paths.push(TracedPath { path, color, pixels, stroke });
            true
        };
-        for comp in trace_mask(&mask, w, h) {
+        let mut comps = trace_mask(&mask, bw, bh);
+        drop(mask);
+        for comp in &mut comps {
+            for l in std::iter::once(&mut comp.outer).chain(&mut comp.holes) {
+                for p in &mut l.pts {
+                    *p = (p.0 + x0 as i32, p.1 + y0 as i32);
+                }
+            }
+        }
+        for comp in comps {
            let fit = |l: &Loop| fit::fit_loop(l, w, h, &|c| (self.shift(c), self.neighbour(c)), &|x, y| self.junction(x, y), &self.style);
            let Some(outer) = fit(&comp.outer) else { continue };
            let mut subs = vec![outer];
@@ -756,9 +808,14 @@ impl Layers<'_> {
 }

 /// `f` of each of `items`, in order, spread over the available cores.
-#[cfg(not(target_arch = "wasm32"))]
 fn parallel_map<T: Sync, R: Send>(items: &[T], f: impl Fn(&T) -> R + Sync) -> Vec<R> {
-    let threads = std::thread::available_parallelism().map_or(1, |n| n.get()).min(items.len());
+    parallel_map_at_most(usize::MAX, items, f)
+}
+
+/// `f` of each of `items`, in order, spread over the available cores, at most `at_a_time` at once.
+#[cfg(not(target_arch = "wasm32"))]
+fn parallel_map_at_most<T: Sync, R: Send>(at_a_time: usize, items: &[T], f: impl Fn(&T) -> R + Sync) -> Vec<R> {
+    let threads = std::thread::available_parallelism().map_or(1, |n| n.get()).min(items.len()).min(at_a_time);
    if threads <= 1 {
        return items.iter().map(f).collect();
    }
@@ -787,7 +844,7 @@ fn parallel_map<T: Sync, R: Send>(items: &[T], f: impl Fn(&T) -> R + Sync) -> Ve

 /// `f` of each of `items`, in order (no threads on the web).
 #[cfg(target_arch = "wasm32")]
-fn parallel_map<T: Sync, R: Send>(items: &[T], f: impl Fn(&T) -> R + Sync) -> Vec<R> {
+fn parallel_map_at_most<T: Sync, R: Send>(_: usize, items: &[T], f: impl Fn(&T) -> R + Sync) -> Vec<R> {
    items.iter().map(f).collect()
 }

@@ -1037,3 +1037,38 @@ fn abutting_regions_share_one_curve_along_their_edge() {
    }
    assert!(shared >= 12, "{shared} shared curves");
 }
+
+#[test]
+fn layers_traced_a_few_at_a_time_come_out_the_same() {
+    let items: Vec<usize> = (0..40).collect();
+    for at_a_time in [1, 3, usize::MAX] {
+        assert_eq!(parallel_map_at_most(at_a_time, &items, |i| i * i), items.iter().map(|i| i * i).collect::<Vec<_>>());
+    }
+    // A layer is traced within the box of its pixels: a shape far from the image's origin stays there.
+    let img = Raster::from_fn(90, 70, |x, y| if (60..80).contains(&x) && (40..60).contains(&y) { BLACK } else { WHITE });
+    let b = trace(&img, &bw()).paths[0].path.bounds().unwrap();
+    assert!([(b.x0, 60.0), (b.y0, 40.0), (b.x1, 80.0), (b.y1, 60.0)].iter().all(|(got, want)| (got - want).abs() < 0.01), "{b:?}");
+}
+
+#[test]
+fn a_blurred_thin_line_on_unevenly_lit_paper_is_a_few_anchors() {
+    // A line 2 px wide a little off the pixel rows, blurred over three pixels, on paper that is a
+    // quarter darker at one end than at the other: nowhere is its ink pure black, or the paper white.
+    let img = Raster::from_fn(160, 40, |x, y| {
+        let (fx, fy) = (f64::from(x) + 0.5, f64::from(y) + 0.5);
+        let paper = 235.0 - 55.0 * fx / 160.0;
+        let centre = 17.3 + 0.06 * fx;
+        // The share of ink in the pixel, the line's edges blurred linearly over 1.5 px either way.
+        let ink = if (10.0..150.0).contains(&fx) { ((1.0 + 1.5 - (fy - centre).abs()) / 3.0).clamp(0.0, 1.0) } else { 0.0 };
+        let v = (paper * (1.0 - ink) + 40.0 * ink).round() as u8;
+        [v, v, v, 255]
+    });
+    let res = trace(&img, &preset("Line Art").unwrap());
+    assert_eq!(res.paths.len(), 1);
+    let path = &res.paths[0].path;
+    // Its two long edges are smooth: a ripple would take an anchor every few pixels.
+    assert!(path.anchor_count() <= 10, "{} anchors", path.anchor_count());
+    // And it lies along the line's middle, about as wide as its ink.
+    let off = along(path).iter().filter(|p| p.x > 14.0 && p.x < 146.0).map(|p| ((p.y - (17.3 + 0.06 * p.x)).abs() - 1.0).abs()).fold(0.0, f64::max);
+    assert!(off < 0.5, "edges {off} px from where the ink's width puts them");
+}
@@ -1,6 +1,6 @@
 # Image Trace quality

-> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (shared edges: gaps and overlaps between abutting paths from 22 to 50 px down to under 1)
+> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (thin lines in blurred and scanned art: Line Art 78 anchors to 46, 0.093 px off to 0.055)

 What Image Trace (`crates/trace`) makes of images whose right answer is known, measured by a harness and
 compared with the numbers before each change. Nothing here is a judgement by eye, and nothing is compared
@@ -72,25 +72,25 @@ Each preset on the inputs it is meant for, all sizes and variants.
 | Technical Drawing | polygons, star, letter A, lines | 2.66 | 13.45 | 0.201 | 1.37 | 105.76 | 4.8 | 32 | 2.23 | 100 | 85 | 5.9 | – | – | – | – | 0.1 | 0.0 |
 | Flat Logo | two touching halves, four-colour badge | 0.43 | 3.53 | 3.106 | 88.50 | 0.78 | 69.9 | 352 | 38.92 | 38 | 80 | 237.0 | 0.0 | 0 | 13.8 | – | 59.1 | 0.2 |

-### Now (sub-pixel edges, the palette, photo smoothing, shared edges)
+### Now (sub-pixel edges, the palette, photo smoothing, shared edges, memory, thin lines)

 | preset | inputs | ΔE | edge ΔE | off mean | off max | missed max | paths | anchors | × art | lines % | corners % | kinks | odd colours | odd px | gap px | overlap px | specks | outside px |
 |:--|:--|--:|--:|--:|--:|--:|--:|--:|--:|--:|--:|--:|--:|--:|--:|--:|--:|--:|
-| Default | circle, ellipses, badge with a hole, letter D, polygons, star, letter A | 2.60 | 10.04 | 0.092 | 1.02 | 2.17 | 1.9 | 18 | 1.78 | 29 | 68 | 0.4 | – | – | 0.8 | 0.5 | 0.0 | 0.0 |
+| Default | circle, ellipses, badge with a hole, letter D, polygons, star, letter A | 2.60 | 10.02 | 0.090 | 1.02 | 2.22 | 1.9 | 17 | 1.74 | 29 | 69 | 0.4 | – | – | 0.5 | 0.6 | 0.0 | 0.0 |
 | High Fidelity Photo | gradient, photo-like | 1.75 | 1.97 | – | – | – | 120.7 | 10001 | – | 38 | – | – | – | – | 0.0 | – | 10.3 | 0.0 |
 | Low Fidelity Photo | gradient, photo-like | 2.45 | 2.69 | – | – | – | 37.1 | 2118 | – | 41 | – | – | – | – | 0.0 | – | 0.0 | 0.0 |
 | 3 Colors | two touching halves | 0.42 | 3.98 | 0.104 | 0.91 | 0.91 | 2.0 | 11 | 1.81 | 39 | 100 | 0.0 | 0.0 | 0 | 0.0 | 0.0 | 0.0 | 0.0 |
 | 6 Colors | two touching halves, four-colour badge | 0.55 | 4.98 | 0.140 | 1.34 | 1.19 | 4.0 | 50 | 3.13 | 38 | 86 | 5.2 | 0.0 | 0 | 0.2 | 0.3 | 0.0 | 0.0 |
 | 16 Colors | two touching halves, four-colour badge | 0.55 | 4.90 | 0.141 | 1.31 | 1.19 | 4.2 | 62 | 3.79 | 39 | 86 | 6.4 | 0.0 | 0 | 0.2 | 0.2 | 0.0 | 0.0 |
 | Shades of Gray | gradient, photo-like | 9.26 | 9.06 | – | – | – | 16.5 | 695 | – | 51 | – | – | – | – | 0.0 | – | 0.5 | 0.0 |
-| Black and White Logo | circle, ellipses, badge with a hole, letter D, polygons, star, letter A | 2.58 | 9.37 | 0.063 | 1.02 | 2.17 | 1.4 | 27 | 2.69 | 39 | 68 | 0.2 | – | – | – | – | 0.0 | 0.0 |
-| Sketched Art | circle, ellipses, badge with a hole, letter D, lines | 2.71 | 12.12 | 0.197 | 1.00 | 105.53 | 1.8 | 17 | 1.48 | 15 | 86 | 0.0 | – | – | – | – | 0.0 | 0.0 |
-| Silhouettes | circle, ellipses, badge with a hole, letter D | 2.98 | 19.22 | 0.523 | 2.23 | 2.21 | 1.2 | 14 | 1.64 | 11 | 75 | 0.2 | – | – | – | – | 0.0 | 0.0 |
-| Line Art | lines | 2.65 | 9.88 | 0.093 | 0.91 | 105.75 | 5.4 | 78 | 3.92 | 36 | – | – | – | – | – | – | 0.1 | 0.0 |
-| Technical Drawing | polygons, star, letter A, lines | 2.55 | 9.72 | 0.092 | 1.06 | 105.75 | 4.8 | 56 | 3.67 | 71 | 74 | 0.7 | – | – | – | – | 1.3 | 0.0 |
+| Black and White Logo | circle, ellipses, badge with a hole, letter D, polygons, star, letter A | 2.58 | 9.33 | 0.059 | 1.02 | 2.22 | 1.4 | 29 | 2.88 | 39 | 69 | 0.3 | – | – | – | – | 0.0 | 0.0 |
+| Sketched Art | circle, ellipses, badge with a hole, letter D, lines | 2.71 | 11.98 | 0.186 | 1.00 | 105.61 | 1.8 | 17 | 1.47 | 16 | 86 | 0.0 | – | – | – | – | 0.0 | 0.0 |
+| Silhouettes | circle, ellipses, badge with a hole, letter D | 2.98 | 19.28 | 0.524 | 2.19 | 2.18 | 1.2 | 14 | 1.65 | 11 | 79 | 0.3 | – | – | – | – | 0.0 | 0.0 |
+| Line Art | lines | 2.62 | 9.44 | 0.055 | 0.96 | 105.82 | 5.4 | 46 | 2.29 | 41 | – | – | – | – | – | – | 0.1 | 0.0 |
+| Technical Drawing | polygons, star, letter A, lines | 2.54 | 9.65 | 0.084 | 1.02 | 105.82 | 4.8 | 46 | 3.23 | 71 | 73 | 0.8 | – | – | – | – | 1.2 | 0.0 |
 | Flat Logo | two touching halves, four-colour badge | 0.43 | 3.53 | 3.106 | 88.50 | 0.78 | 69.9 | 352 | 38.92 | 38 | 80 | 237.0 | 0.0 | 0 | 13.8 | – | 59.1 | 0.2 |

-The sections below are the numbers now (sub-pixel edges, the palette, photo smoothing, shared edges).
+The sections below are the numbers now (sub-pixel edges, the palette, photo smoothing, shared edges, memory, thin lines).

 ## 1. Each preset on the inputs it is meant for

@@ -98,29 +98,29 @@ All sizes and variants (clean, aliased, blurred, noisy, scanned) of those inputs

 | preset | inputs | ΔE | edge ΔE | off mean | off max | missed max | paths | anchors | × art | lines % | corners % | kinks | odd colours | odd px | gap px | overlap px | specks | outside px |
 |:--|:--|--:|--:|--:|--:|--:|--:|--:|--:|--:|--:|--:|--:|--:|--:|--:|--:|--:|
-| Default | circle, ellipses, badge with a hole, letter D, polygons, star, letter A | 2.60 | 10.04 | 0.092 | 1.02 | 2.17 | 1.9 | 18 | 1.78 | 29 | 68 | 0.4 | – | – | 0.8 | 0.5 | 0.0 | 0.0 |
+| Default | circle, ellipses, badge with a hole, letter D, polygons, star, letter A | 2.60 | 10.02 | 0.090 | 1.02 | 2.22 | 1.9 | 17 | 1.74 | 29 | 69 | 0.4 | – | – | 0.5 | 0.6 | 0.0 | 0.0 |
 | High Fidelity Photo | gradient, photo-like | 1.75 | 1.97 | – | – | – | 120.7 | 10001 | – | 38 | – | – | – | – | 0.0 | – | 10.3 | 0.0 |
 | Low Fidelity Photo | gradient, photo-like | 2.45 | 2.69 | – | – | – | 37.1 | 2118 | – | 41 | – | – | – | – | 0.0 | – | 0.0 | 0.0 |
 | 3 Colors | two touching halves | 0.42 | 3.98 | 0.104 | 0.91 | 0.91 | 2.0 | 11 | 1.81 | 39 | 100 | 0.0 | 0.0 | 0 | 0.0 | 0.0 | 0.0 | 0.0 |
 | 6 Colors | two touching halves, four-colour badge | 0.55 | 4.98 | 0.140 | 1.34 | 1.19 | 4.0 | 50 | 3.13 | 38 | 86 | 5.2 | 0.0 | 0 | 0.2 | 0.3 | 0.0 | 0.0 |
 | 16 Colors | two touching halves, four-colour badge | 0.55 | 4.90 | 0.141 | 1.31 | 1.19 | 4.2 | 62 | 3.79 | 39 | 86 | 6.4 | 0.0 | 0 | 0.2 | 0.2 | 0.0 | 0.0 |
 | Shades of Gray | gradient, photo-like | 9.26 | 9.06 | – | – | – | 16.5 | 695 | – | 51 | – | – | – | – | 0.0 | – | 0.5 | 0.0 |
-| Black and White Logo | circle, ellipses, badge with a hole, letter D, polygons, star, letter A | 2.58 | 9.37 | 0.063 | 1.02 | 2.17 | 1.4 | 27 | 2.69 | 39 | 68 | 0.2 | – | – | – | – | 0.0 | 0.0 |
-| Sketched Art | circle, ellipses, badge with a hole, letter D, lines | 2.71 | 12.12 | 0.197 | 1.00 | 105.53 | 1.8 | 17 | 1.48 | 15 | 86 | 0.0 | – | – | – | – | 0.0 | 0.0 |
-| Silhouettes | circle, ellipses, badge with a hole, letter D | 2.98 | 19.22 | 0.523 | 2.23 | 2.21 | 1.2 | 14 | 1.64 | 11 | 75 | 0.2 | – | – | – | – | 0.0 | 0.0 |
-| Line Art | lines | 2.65 | 9.88 | 0.093 | 0.91 | 105.75 | 5.4 | 78 | 3.92 | 36 | – | – | – | – | – | – | 0.1 | 0.0 |
-| Technical Drawing | polygons, star, letter A, lines | 2.55 | 9.72 | 0.092 | 1.06 | 105.75 | 4.8 | 56 | 3.67 | 71 | 74 | 0.7 | – | – | – | – | 1.3 | 0.0 |
+| Black and White Logo | circle, ellipses, badge with a hole, letter D, polygons, star, letter A | 2.58 | 9.33 | 0.059 | 1.02 | 2.22 | 1.4 | 29 | 2.88 | 39 | 69 | 0.3 | – | – | – | – | 0.0 | 0.0 |
+| Sketched Art | circle, ellipses, badge with a hole, letter D, lines | 2.71 | 11.98 | 0.186 | 1.00 | 105.61 | 1.8 | 17 | 1.47 | 16 | 86 | 0.0 | – | – | – | – | 0.0 | 0.0 |
+| Silhouettes | circle, ellipses, badge with a hole, letter D | 2.98 | 19.28 | 0.524 | 2.19 | 2.18 | 1.2 | 14 | 1.65 | 11 | 79 | 0.3 | – | – | – | – | 0.0 | 0.0 |
+| Line Art | lines | 2.62 | 9.44 | 0.055 | 0.96 | 105.82 | 5.4 | 46 | 2.29 | 41 | – | – | – | – | – | – | 0.1 | 0.0 |
+| Technical Drawing | polygons, star, letter A, lines | 2.54 | 9.65 | 0.084 | 1.02 | 105.82 | 4.8 | 46 | 3.23 | 71 | 73 | 0.8 | – | – | – | – | 1.2 | 0.0 |
 | Flat Logo | two touching halves, four-colour badge | 0.43 | 3.53 | 3.106 | 88.50 | 0.78 | 69.9 | 352 | 38.92 | 38 | 80 | 237.0 | 0.0 | 0 | 13.8 | – | 59.1 | 0.2 |

 ## 2. Each preset on each kind of input (clean, three sizes)

 | preset | inputs | ΔE | edge ΔE | off mean | off max | missed max | paths | anchors | × art | lines % | corners % | kinks | odd colours | odd px | gap px | overlap px | specks | outside px |
 |:--|:--|--:|--:|--:|--:|--:|--:|--:|--:|--:|--:|--:|--:|--:|--:|--:|--:|--:|
-| Default | curved shapes | 0.09 | 3.51 | 0.062 | 0.64 | 0.78 | 1.8 | 15 | 1.64 | 13 | 83 | 0.0 | – | – | 0.0 | 0.0 | 0.0 | 0.0 |
-| Default | polygons | 0.05 | 2.13 | 0.036 | 0.44 | 1.24 | 2.0 | 14 | 1.26 | 89 | 90 | 0.0 | – | – | 0.0 | 0.0 | 0.0 | 0.0 |
-| Default | thin lines | 0.56 | 4.77 | 0.061 | 0.47 | 105.57 | 3.3 | 24 | 1.18 | 43 | – | – | – | – | 0.0 | 0.0 | 0.0 | 0.0 |
-| Default | flat colour art | 19.95 | 19.00 | 0.199 | 0.53 | 179.52 | 1.5 | 19 | 1.18 | 14 | 0 | 0.0 | – | – | 0.0 | 0.0 | 0.0 | 0.0 |
-| Default | gradient, photo | 39.14 | 38.78 | – | – | – | 3.2 | 593 | – | 55 | – | – | – | – | 18.6 | 30.6 | 0.0 | 0.0 |
+| Default | curved shapes | 0.09 | 3.47 | 0.061 | 0.64 | 0.78 | 1.8 | 15 | 1.62 | 13 | 83 | 0.0 | – | – | 0.0 | 0.0 | 0.0 | 0.0 |
+| Default | polygons | 0.05 | 2.12 | 0.035 | 0.43 | 1.24 | 2.0 | 14 | 1.26 | 88 | 89 | 0.0 | – | – | 0.0 | 0.0 | 0.0 | 0.0 |
+| Default | thin lines | 0.53 | 4.28 | 0.045 | 0.47 | 105.51 | 3.3 | 23 | 1.15 | 48 | – | – | – | – | 0.0 | 0.0 | 0.0 | 0.0 |
+| Default | flat colour art | 19.91 | 17.97 | 0.172 | 0.51 | 179.34 | 1.5 | 16 | 1.17 | 14 | 0 | 0.0 | – | – | 0.0 | 0.0 | 0.0 | 0.0 |
+| Default | gradient, photo | 39.03 | 38.65 | – | – | – | 3.2 | 601 | – | 54 | – | – | – | – | 19.1 | 38.4 | 0.0 | 0.0 |
 | High Fidelity Photo | curved shapes | 0.04 | 1.66 | 0.026 | 0.18 | 0.20 | 1.2 | 19 | 2.12 | 20 | 100 | 0.0 | 0.0 | 0 | 0.0 | – | 0.0 | 0.0 |
 | High Fidelity Photo | polygons | 0.05 | 1.88 | 0.031 | 0.51 | 1.34 | 1.7 | 16 | 1.43 | 88 | 89 | 0.0 | 0.0 | 0 | 0.0 | – | 0.0 | 0.0 |
 | High Fidelity Photo | thin lines | 0.34 | 5.96 | 0.075 | 0.85 | 4.31 | 40.3 | 339 | 16.93 | 37 | – | – | 27.3 | 4490 | 0.0 | – | 19.0 | 0.0 |
@@ -151,31 +151,31 @@ All sizes and variants (clean, aliased, blurred, noisy, scanned) of those inputs
 | Shades of Gray | thin lines | 0.55 | 6.55 | 0.083 | 0.86 | 45.40 | 10.3 | 73 | 3.67 | 50 | – | – | 8.0 | 4272 | 0.0 | – | 0.0 | 0.0 |
 | Shades of Gray | flat colour art | 7.33 | 11.24 | 0.257 | 1.43 | 179.39 | 4.7 | 200 | 18.45 | 22 | 50 | 0.3 | 3.7 | 173367 | 0.0 | – | 0.0 | 0.0 |
 | Shades of Gray | gradient, photo | 9.71 | 9.55 | – | – | – | 18.2 | 748 | – | 51 | – | – | – | – | 0.0 | – | 0.5 | 0.0 |
-| Black and White Logo | curved shapes | 0.04 | 1.51 | 0.024 | 0.50 | 0.59 | 1.2 | 21 | 2.29 | 20 | 83 | 0.0 | – | – | – | – | 0.0 | 0.0 |
-| Black and White Logo | polygons | 0.04 | 1.83 | 0.030 | 0.43 | 1.24 | 1.7 | 16 | 1.39 | 90 | 90 | 0.0 | – | – | – | – | 0.0 | 0.0 |
-| Black and White Logo | thin lines | 0.60 | 6.10 | 0.111 | 0.50 | 77.21 | 10.3 | 48 | 2.38 | 83 | – | – | – | – | – | – | 3.3 | 0.0 |
-| Black and White Logo | flat colour art | 19.94 | 18.71 | 0.192 | 0.32 | 179.52 | 1.0 | 20 | 1.22 | 23 | 0 | 0.0 | – | – | – | – | 0.0 | 0.0 |
-| Black and White Logo | gradient, photo | 39.11 | 38.71 | – | – | – | 9.0 | 574 | – | 67 | – | – | – | – | – | – | 0.0 | 0.0 |
-| Sketched Art | curved shapes | 0.14 | 5.77 | 0.112 | 0.47 | 0.47 | 1.2 | 12 | 1.38 | 16 | 100 | 0.0 | – | – | – | – | 0.0 | 0.0 |
-| Sketched Art | polygons | 0.12 | 4.81 | 0.088 | 0.52 | 1.05 | 1.7 | 13 | 1.18 | 85 | 88 | 0.0 | – | – | – | – | 0.0 | 0.0 |
-| Sketched Art | thin lines | 0.40 | 5.10 | 0.106 | 0.80 | 52.93 | 4.3 | 39 | 1.93 | 35 | – | – | – | – | – | – | 0.0 | 0.0 |
-| Sketched Art | flat colour art | 20.32 | 21.13 | 0.179 | 0.87 | 179.64 | 1.5 | 24 | 1.43 | 16 | 0 | 0.0 | – | – | – | – | 0.0 | 0.0 |
-| Sketched Art | gradient, photo | 45.54 | 45.39 | – | – | – | 1.0 | 237 | – | 43 | – | – | – | – | – | – | 0.0 | 0.0 |
-| Silhouettes | curved shapes | 0.36 | 14.54 | 0.282 | 0.71 | 0.71 | 1.2 | 12 | 1.34 | 15 | 100 | 0.0 | – | – | – | – | 0.0 | 0.0 |
-| Silhouettes | polygons | 0.35 | 13.93 | 0.261 | 0.67 | 0.69 | 1.7 | 14 | 1.26 | 76 | 85 | 0.0 | – | – | – | – | 0.0 | 0.0 |
-| Silhouettes | thin lines | 1.03 | 15.78 | 0.304 | 1.09 | 18.10 | 5.0 | 47 | 2.33 | 34 | – | – | – | – | – | – | 0.0 | 0.0 |
-| Silhouettes | flat colour art | 23.86 | 33.99 | 0.224 | 0.77 | 188.38 | 1.0 | 11 | 0.78 | 24 | 0 | 0.0 | – | – | – | – | 0.0 | 0.0 |
-| Silhouettes | gradient, photo | 61.57 | 61.34 | – | – | – | 0.2 | 2 | – | 42 | – | – | – | – | – | – | 0.0 | 0.0 |
-| Line Art | curved shapes | 0.04 | 1.86 | 0.032 | 0.54 | 0.62 | 1.2 | 16 | 1.75 | 19 | 83 | 0.0 | – | – | – | – | 0.0 | 0.0 |
-| Line Art | polygons | 0.05 | 1.90 | 0.031 | 0.40 | 1.24 | 1.7 | 14 | 1.26 | 90 | 90 | 0.0 | – | – | – | – | 0.0 | 0.0 |
-| Line Art | thin lines | 0.54 | 4.39 | 0.049 | 0.47 | 105.75 | 3.3 | 35 | 1.77 | 41 | – | – | – | – | – | – | 0.0 | 0.0 |
-| Line Art | flat colour art | 19.94 | 18.73 | 0.193 | 0.50 | 179.52 | 1.0 | 43 | 2.40 | 22 | 0 | 0.0 | – | – | – | – | 0.0 | 0.0 |
-| Line Art | gradient, photo | 39.12 | 38.72 | – | – | – | 7.7 | 448 | – | 57 | – | – | – | – | – | – | 0.0 | 0.0 |
-| Technical Drawing | curved shapes | 0.04 | 1.51 | 0.024 | 0.50 | 0.59 | 1.2 | 21 | 2.29 | 20 | 83 | 0.0 | – | – | – | – | 0.0 | 0.0 |
-| Technical Drawing | polygons | 0.04 | 1.83 | 0.030 | 0.43 | 1.24 | 1.7 | 16 | 1.38 | 91 | 91 | 0.0 | – | – | – | – | 0.0 | 0.0 |
-| Technical Drawing | thin lines | 0.53 | 5.83 | 0.125 | 0.50 | 55.75 | 15.3 | 61 | 3.03 | 88 | – | – | – | – | – | – | 8.3 | 0.0 |
-| Technical Drawing | flat colour art | 19.94 | 18.71 | 0.192 | 0.32 | 179.52 | 1.0 | 20 | 1.22 | 23 | 0 | 0.0 | – | – | – | – | 0.0 | 0.0 |
-| Technical Drawing | gradient, photo | 39.08 | 38.68 | – | – | – | 20.0 | 593 | – | 68 | – | – | – | – | – | – | 2.7 | 0.0 |
+| Black and White Logo | curved shapes | 0.03 | 1.49 | 0.024 | 0.51 | 0.59 | 1.2 | 21 | 2.23 | 20 | 83 | 0.0 | – | – | – | – | 0.0 | 0.0 |
+| Black and White Logo | polygons | 0.04 | 1.78 | 0.029 | 0.42 | 1.24 | 1.7 | 16 | 1.42 | 89 | 89 | 0.0 | – | – | – | – | 0.0 | 0.0 |
+| Black and White Logo | thin lines | 0.63 | 6.33 | 0.117 | 0.50 | 77.21 | 10.3 | 53 | 2.63 | 89 | – | – | – | – | – | – | 2.7 | 0.0 |
+| Black and White Logo | flat colour art | 19.90 | 17.76 | 0.157 | 0.30 | 179.51 | 1.0 | 18 | 1.12 | 23 | 0 | 0.0 | – | – | – | – | 0.0 | 0.0 |
+| Black and White Logo | gradient, photo | 38.98 | 38.54 | – | – | – | 9.0 | 573 | – | 70 | – | – | – | – | – | – | 1.2 | 0.0 |
+| Sketched Art | curved shapes | 0.14 | 5.67 | 0.109 | 0.46 | 0.46 | 1.2 | 12 | 1.38 | 16 | 100 | 0.0 | – | – | – | – | 0.0 | 0.0 |
+| Sketched Art | polygons | 0.12 | 4.65 | 0.084 | 0.53 | 1.06 | 1.7 | 13 | 1.19 | 86 | 89 | 0.0 | – | – | – | – | 0.0 | 0.0 |
+| Sketched Art | thin lines | 0.41 | 4.87 | 0.099 | 0.96 | 52.90 | 4.3 | 35 | 1.77 | 38 | – | – | – | – | – | – | 0.0 | 0.0 |
+| Sketched Art | flat colour art | 20.25 | 19.55 | 0.146 | 1.15 | 179.63 | 1.5 | 26 | 1.53 | 16 | 0 | 0.3 | – | – | – | – | 0.0 | 0.0 |
+| Sketched Art | gradient, photo | 45.43 | 45.21 | – | – | – | 1.0 | 240 | – | 44 | – | – | – | – | – | – | 0.0 | 0.0 |
+| Silhouettes | curved shapes | 0.35 | 14.47 | 0.280 | 0.69 | 0.69 | 1.2 | 12 | 1.33 | 15 | 100 | 0.0 | – | – | – | – | 0.0 | 0.0 |
+| Silhouettes | polygons | 0.34 | 13.60 | 0.255 | 0.65 | 0.69 | 1.7 | 14 | 1.22 | 77 | 85 | 0.0 | – | – | – | – | 0.0 | 0.0 |
+| Silhouettes | thin lines | 1.10 | 15.03 | 0.296 | 1.37 | 17.91 | 5.0 | 37 | 1.83 | 44 | – | – | – | – | – | – | 0.0 | 0.0 |
+| Silhouettes | flat colour art | 23.83 | 33.06 | 0.200 | 0.69 | 188.27 | 1.0 | 11 | 0.77 | 25 | 0 | 0.0 | – | – | – | – | 0.0 | 0.0 |
+| Silhouettes | gradient, photo | 61.57 | 61.32 | – | – | – | 0.2 | 2 | – | 47 | – | – | – | – | – | – | 0.0 | 0.0 |
+| Line Art | curved shapes | 0.04 | 1.85 | 0.032 | 0.54 | 0.62 | 1.2 | 16 | 1.76 | 19 | 83 | 0.0 | – | – | – | – | 0.0 | 0.0 |
+| Line Art | polygons | 0.05 | 1.86 | 0.030 | 0.39 | 1.24 | 1.7 | 15 | 1.29 | 88 | 89 | 0.0 | – | – | – | – | 0.0 | 0.0 |
+| Line Art | thin lines | 0.52 | 3.94 | 0.036 | 0.47 | 105.71 | 3.3 | 28 | 1.38 | 45 | – | – | – | – | – | – | 0.0 | 0.0 |
+| Line Art | flat colour art | 19.90 | 17.83 | 0.162 | 0.42 | 179.43 | 1.0 | 18 | 1.30 | 21 | 0 | 0.0 | – | – | – | – | 0.0 | 0.0 |
+| Line Art | gradient, photo | 38.98 | 38.54 | – | – | – | 7.7 | 471 | – | 57 | – | – | – | – | – | – | 0.2 | 0.0 |
+| Technical Drawing | curved shapes | 0.03 | 1.49 | 0.024 | 0.51 | 0.59 | 1.2 | 21 | 2.23 | 20 | 83 | 0.0 | – | – | – | – | 0.0 | 0.0 |
+| Technical Drawing | polygons | 0.04 | 1.79 | 0.029 | 0.42 | 1.24 | 1.7 | 16 | 1.41 | 90 | 90 | 0.0 | – | – | – | – | 0.0 | 0.0 |
+| Technical Drawing | thin lines | 0.53 | 5.80 | 0.121 | 0.50 | 55.74 | 15.3 | 70 | 3.50 | 88 | – | – | – | – | – | – | 7.7 | 0.0 |
+| Technical Drawing | flat colour art | 19.90 | 17.76 | 0.157 | 0.30 | 179.51 | 1.0 | 18 | 1.12 | 23 | 0 | 0.0 | – | – | – | – | 0.0 | 0.0 |
+| Technical Drawing | gradient, photo | 38.94 | 38.51 | – | – | – | 20.0 | 627 | – | 71 | – | – | – | – | – | – | 11.3 | 0.0 |
 | Flat Logo | curved shapes | 0.06 | 2.14 | 0.036 | 0.25 | 0.25 | 1.8 | 31 | 3.38 | 19 | 100 | 0.0 | 0.0 | 0 | 6.8 | – | 0.0 | 0.0 |
 | Flat Logo | polygons | 0.09 | 3.44 | 0.060 | 0.35 | 1.03 | 2.0 | 35 | 3.17 | 67 | 94 | 0.0 | 0.0 | 0 | 6.8 | – | 0.0 | 0.0 |
 | Flat Logo | thin lines | 1.17 | 11.78 | 0.050 | 0.49 | all | 3.0 | 189 | 9.45 | 28 | – | – | 0.0 | 0 | 5467.1 | – | 0.0 | 0.0 |
@@ -186,11 +186,11 @@ All sizes and variants (clean, aliased, blurred, noisy, scanned) of those inputs

 | preset | variant | ΔE | edge ΔE | off mean | off max | missed max | paths | anchors | × art | lines % | corners % | kinks | odd colours | odd px | gap px | overlap px | specks | outside px |
 |:--|:--|--:|--:|--:|--:|--:|--:|--:|--:|--:|--:|--:|--:|--:|--:|--:|--:|--:|
-| Default | clean | 0.07 | 2.92 | 0.051 | 0.64 | 1.24 | 1.9 | 15 | 1.48 | 46 | 89 | 0.0 | – | – | 0.0 | 0.0 | 0.0 | 0.0 |
+| Default | clean | 0.07 | 2.89 | 0.050 | 0.64 | 1.24 | 1.9 | 15 | 1.46 | 45 | 88 | 0.0 | – | – | 0.0 | 0.0 | 0.0 | 0.0 |
 | Default | aliased | 0.37 | 20.23 | 0.233 | 1.02 | 1.35 | 1.9 | 15 | 1.45 | 21 | 96 | 0.0 | – | – | 0.0 | 0.0 | 0.0 | 0.0 |
-| Default | blurred | 0.82 | 16.64 | 0.078 | 0.97 | 2.17 | 1.9 | 25 | 2.42 | 5 | 21 | 1.4 | – | – | 0.0 | 0.0 | 0.0 | 0.0 |
-| Default | noisy | 1.74 | 4.50 | 0.050 | 0.54 | 1.24 | 1.9 | 16 | 1.64 | 39 | 67 | 0.0 | – | – | 2.3 | 0.6 | 0.0 | 0.0 |
-| Default | scanned | 15.06 | 20.19 | 0.132 | 0.86 | 2.17 | 1.9 | 25 | 2.50 | 0 | 25 | 1.1 | – | – | 3.6 | 2.9 | 0.0 | 0.0 |
+| Default | blurred | 0.81 | 16.57 | 0.078 | 0.98 | 2.22 | 1.9 | 24 | 2.34 | 5 | 19 | 1.3 | – | – | 0.0 | 0.0 | 0.0 | 0.0 |
+| Default | noisy | 1.74 | 4.53 | 0.054 | 0.54 | 1.32 | 1.9 | 15 | 1.47 | 41 | 84 | 0.0 | – | – | 1.9 | 0.3 | 0.0 | 0.0 |
+| Default | scanned | 15.06 | 20.17 | 0.114 | 0.79 | 2.14 | 1.9 | 26 | 2.53 | 2 | 25 | 1.3 | – | – | 1.6 | 4.2 | 0.0 | 0.0 |
 | High Fidelity Photo | clean | 1.80 | 2.04 | – | – | – | 134.7 | 11321 | – | 39 | – | – | – | – | 0.0 | – | 7.3 | 0.0 |
 | High Fidelity Photo | aliased | 1.77 | 2.00 | – | – | – | 73.0 | 8004 | – | 40 | – | – | – | – | 0.0 | – | 5.5 | 0.0 |
 | High Fidelity Photo | blurred | 1.59 | 1.95 | – | – | – | 72.0 | 7388 | – | 40 | – | – | – | – | 0.0 | – | 0.5 | 0.0 |
@@ -221,31 +221,31 @@ All sizes and variants (clean, aliased, blurred, noisy, scanned) of those inputs
 | Shades of Gray | blurred | 9.66 | 9.32 | – | – | – | 11.5 | 577 | – | 55 | – | – | – | – | 0.0 | – | 0.5 | 0.0 |
 | Shades of Gray | noisy | 9.74 | 9.45 | – | – | – | 19.5 | 643 | – | 45 | – | – | – | – | 0.0 | – | 0.0 | 0.0 |
 | Shades of Gray | scanned | 6.58 | 6.46 | – | – | – | 19.0 | 762 | – | 47 | – | – | – | – | 0.0 | – | 1.0 | 0.0 |
-| Black and White Logo | clean | 0.04 | 1.64 | 0.027 | 0.50 | 1.24 | 1.4 | 19 | 1.90 | 50 | 89 | 0.0 | – | – | – | – | 0.0 | 0.0 |
+| Black and White Logo | clean | 0.04 | 1.62 | 0.026 | 0.51 | 1.24 | 1.4 | 19 | 1.89 | 50 | 88 | 0.0 | – | – | – | – | 0.0 | 0.0 |
 | Black and White Logo | aliased | 0.39 | 20.35 | 0.172 | 1.02 | 1.35 | 1.4 | 22 | 2.32 | 53 | 96 | 0.0 | – | – | – | – | 0.0 | 0.0 |
-| Black and White Logo | blurred | 0.80 | 16.29 | 0.045 | 0.82 | 2.15 | 1.4 | 38 | 3.62 | 21 | 21 | 0.9 | – | – | – | – | 0.0 | 0.0 |
-| Black and White Logo | noisy | 1.72 | 3.90 | 0.028 | 0.51 | 1.24 | 1.4 | 22 | 2.18 | 40 | 67 | 0.0 | – | – | – | – | 0.0 | 0.0 |
-| Black and White Logo | scanned | 15.05 | 20.10 | 0.115 | 0.86 | 2.17 | 1.4 | 51 | 5.02 | 11 | 25 | 0.9 | – | – | – | – | 0.0 | 0.0 |
-| Sketched Art | clean | 0.19 | 5.64 | 0.111 | 0.80 | 52.93 | 1.9 | 18 | 1.49 | 19 | 100 | 0.0 | – | – | – | – | 0.0 | 0.0 |
-| Sketched Art | aliased | 0.46 | 19.57 | 0.213 | 1.00 | 105.53 | 1.6 | 11 | 1.10 | 26 | 100 | 0.0 | – | – | – | – | 0.0 | 0.0 |
-| Sketched Art | blurred | 1.07 | 19.72 | 0.274 | 0.70 | 105.49 | 1.6 | 17 | 1.53 | 10 | 50 | 0.0 | – | – | – | – | 0.0 | 0.0 |
-| Sketched Art | noisy | 1.76 | 6.16 | 0.119 | 0.95 | 1.03 | 2.0 | 19 | 1.58 | 12 | 100 | 0.0 | – | – | – | – | 0.0 | 0.0 |
-| Sketched Art | scanned | 15.12 | 22.50 | 0.442 | 0.86 | 105.27 | 1.6 | 20 | 1.65 | 2 | 50 | 0.0 | – | – | – | – | 0.0 | 0.0 |
-| Silhouettes | clean | 0.36 | 14.54 | 0.282 | 0.71 | 0.71 | 1.2 | 12 | 1.34 | 15 | 100 | 0.0 | – | – | – | – | 0.0 | 0.0 |
+| Black and White Logo | blurred | 0.80 | 16.24 | 0.049 | 0.84 | 2.22 | 1.4 | 40 | 3.92 | 21 | 19 | 1.0 | – | – | – | – | 0.0 | 0.0 |
+| Black and White Logo | noisy | 1.72 | 3.86 | 0.027 | 0.49 | 1.32 | 1.4 | 21 | 2.12 | 42 | 84 | 0.0 | – | – | – | – | 0.0 | 0.0 |
+| Black and White Logo | scanned | 15.05 | 20.00 | 0.090 | 0.79 | 2.10 | 1.4 | 63 | 6.11 | 9 | 25 | 1.0 | – | – | – | – | 0.0 | 0.0 |
+| Sketched Art | clean | 0.19 | 5.51 | 0.107 | 0.96 | 52.90 | 1.9 | 17 | 1.46 | 20 | 100 | 0.0 | – | – | – | – | 0.0 | 0.0 |
+| Sketched Art | aliased | 0.47 | 19.58 | 0.213 | 1.00 | 105.54 | 1.6 | 11 | 1.10 | 26 | 100 | 0.0 | – | – | – | – | 0.0 | 0.0 |
+| Sketched Art | blurred | 1.05 | 19.32 | 0.242 | 0.76 | 105.55 | 1.6 | 19 | 1.59 | 9 | 50 | 0.0 | – | – | – | – | 0.0 | 0.0 |
+| Sketched Art | noisy | 1.76 | 6.13 | 0.116 | 0.90 | 1.06 | 2.0 | 18 | 1.48 | 12 | 100 | 0.0 | – | – | – | – | 0.0 | 0.0 |
+| Sketched Art | scanned | 15.10 | 22.32 | 0.407 | 0.78 | 105.61 | 1.6 | 21 | 1.75 | 2 | 50 | 0.0 | – | – | – | – | 0.0 | 0.0 |
+| Silhouettes | clean | 0.35 | 14.47 | 0.280 | 0.69 | 0.69 | 1.2 | 12 | 1.33 | 15 | 100 | 0.0 | – | – | – | – | 0.0 | 0.0 |
 | Silhouettes | aliased | 0.39 | 21.69 | 0.289 | 1.00 | 1.00 | 1.2 | 9 | 0.99 | 12 | 100 | 0.0 | – | – | – | – | 0.0 | 0.0 |
-| Silhouettes | blurred | 1.21 | 28.11 | 0.785 | 1.45 | 1.92 | 1.2 | 15 | 1.82 | 11 | 25 | 0.0 | – | – | – | – | 0.0 | 0.0 |
-| Silhouettes | noisy | 2.11 | 10.96 | 0.284 | 0.69 | 0.69 | 1.2 | 11 | 1.27 | 7 | 100 | 0.0 | – | – | – | – | 0.0 | 0.0 |
-| Silhouettes | scanned | 16.05 | 30.19 | 1.458 | 2.23 | 2.21 | 1.2 | 25 | 3.37 | 3 | 0 | 1.2 | – | – | – | – | 0.0 | 0.0 |
-| Line Art | clean | 0.54 | 4.39 | 0.049 | 0.47 | 105.75 | 3.3 | 35 | 1.77 | 41 | – | – | – | – | – | – | 0.0 | 0.0 |
+| Silhouettes | blurred | 1.24 | 28.75 | 0.818 | 1.44 | 1.92 | 1.2 | 14 | 1.72 | 10 | 50 | 0.0 | – | – | – | – | 0.0 | 0.0 |
+| Silhouettes | noisy | 2.11 | 11.05 | 0.284 | 0.68 | 0.69 | 1.2 | 11 | 1.28 | 9 | 100 | 0.0 | – | – | – | – | 0.0 | 0.0 |
+| Silhouettes | scanned | 16.03 | 30.07 | 1.438 | 2.19 | 2.18 | 1.2 | 28 | 3.55 | 3 | 0 | 2.0 | – | – | – | – | 0.0 | 0.0 |
+| Line Art | clean | 0.52 | 3.94 | 0.036 | 0.47 | 105.71 | 3.3 | 28 | 1.38 | 45 | – | – | – | – | – | – | 0.0 | 0.0 |
 | Line Art | aliased | 0.67 | 14.44 | 0.112 | 0.73 | 55.44 | 14.0 | 59 | 2.95 | 87 | – | – | – | – | – | – | 0.0 | 0.0 |
-| Line Art | blurred | 1.63 | 17.15 | 0.136 | 0.89 | 105.57 | 3.0 | 143 | 7.15 | 4 | – | – | – | – | – | – | 0.0 | 0.0 |
-| Line Art | noisy | 1.04 | 4.35 | 0.045 | 0.48 | 56.06 | 8.0 | 53 | 2.65 | 38 | – | – | – | – | – | – | 1.0 | 0.0 |
-| Line Art | scanned | 13.60 | 20.06 | 0.214 | 0.91 | 105.64 | 3.0 | 188 | 9.40 | 1 | – | – | – | – | – | – | 0.0 | 0.0 |
-| Technical Drawing | clean | 0.17 | 2.83 | 0.054 | 0.50 | 55.75 | 5.1 | 27 | 1.79 | 90 | 91 | 0.0 | – | – | – | – | 2.1 | 0.0 |
+| Line Art | blurred | 1.56 | 16.20 | 0.068 | 0.96 | 105.82 | 3.0 | 53 | 2.65 | 19 | – | – | – | – | – | – | 0.0 | 0.0 |
+| Line Art | noisy | 1.02 | 3.98 | 0.030 | 0.50 | 56.08 | 8.0 | 56 | 2.80 | 42 | – | – | – | – | – | – | 1.0 | 0.0 |
+| Line Art | scanned | 13.55 | 19.60 | 0.069 | 0.87 | 105.78 | 3.0 | 70 | 3.50 | 4 | – | – | – | – | – | – | 0.0 | 0.0 |
+| Technical Drawing | clean | 0.17 | 2.79 | 0.052 | 0.50 | 55.74 | 5.1 | 30 | 1.93 | 89 | 90 | 0.0 | – | – | – | – | 1.9 | 0.0 |
 | Technical Drawing | aliased | 0.43 | 18.51 | 0.204 | 1.02 | 55.44 | 6.8 | 33 | 2.06 | 95 | 94 | 0.0 | – | – | – | – | 0.0 | 0.0 |
-| Technical Drawing | blurred | 1.04 | 16.59 | 0.082 | 1.06 | 105.75 | 2.0 | 114 | 7.50 | 24 | 28 | 2.3 | – | – | – | – | 0.0 | 0.0 |
-| Technical Drawing | noisy | 1.42 | 4.30 | 0.055 | 0.50 | 31.23 | 7.8 | 38 | 2.40 | 85 | 90 | 0.0 | – | – | – | – | 2.8 | 0.0 |
-| Technical Drawing | scanned | 14.45 | 20.15 | 0.144 | 0.91 | 105.74 | 2.0 | 123 | 8.33 | 23 | 34 | 2.3 | – | – | – | – | 0.0 | 0.0 |
+| Technical Drawing | blurred | 1.03 | 16.48 | 0.076 | 0.96 | 105.82 | 2.0 | 58 | 4.73 | 26 | 25 | 2.7 | – | – | – | – | 0.0 | 0.0 |
+| Technical Drawing | noisy | 1.41 | 4.24 | 0.053 | 0.50 | 31.79 | 7.8 | 41 | 2.51 | 85 | 86 | 0.0 | – | – | – | – | 2.8 | 0.0 |
+| Technical Drawing | scanned | 14.44 | 19.98 | 0.100 | 0.87 | 105.79 | 2.0 | 98 | 7.51 | 23 | 34 | 2.7 | – | – | – | – | 0.0 | 0.0 |
 | Flat Logo | clean | 0.07 | 1.53 | 0.065 | 0.31 | 0.27 | 3.0 | 36 | 3.51 | 47 | 100 | 0.0 | 0.0 | 0 | 6.8 | – | 0.0 | 0.0 |
 | Flat Logo | aliased | 0.13 | 5.87 | 0.218 | 0.65 | 0.65 | 3.0 | 31 | 1.96 | 44 | 50 | 0.0 | 0.0 | 0 | 5.8 | – | 0.0 | 0.0 |
 | Flat Logo | blurred | 0.54 | 8.33 | 0.052 | 0.62 | 0.78 | 3.0 | 28 | 1.78 | 43 | 50 | 0.0 | 0.0 | 0 | 5.8 | – | 0.0 | 0.0 |
@@ -282,89 +282,91 @@ One trace at a time on this machine (all cores); memory is the peak allocated ab

 | preset | image | megapixels | result |
 |:--|:--|--:|:--|
-| Default | photo-like | 1 | 0.04 s, 29 paths, 6888 anchors, 15 MB |
-| Default | four-colour badge | 1 | 0.02 s, 3 paths, 96 anchors, 15 MB |
-| High Fidelity Photo | photo-like | 1 | 0.21 s, 968 paths, 114383 anchors, 238 MB |
-| High Fidelity Photo | four-colour badge | 1 | 0.06 s, 6 paths, 172 anchors, 36 MB |
-| Low Fidelity Photo | photo-like | 1 | 0.11 s, 129 paths, 22929 anchors, 144 MB |
-| Low Fidelity Photo | four-colour badge | 1 | 0.05 s, 6 paths, 136 anchors, 36 MB |
-| 3 Colors | photo-like | 1 | 0.08 s, 9 paths, 3367 anchors, 26 MB |
-| 3 Colors | four-colour badge | 1 | 0.05 s, 4 paths, 88 anchors, 21 MB |
-| 6 Colors | photo-like | 1 | 0.08 s, 78 paths, 9008 anchors, 42 MB |
-| 6 Colors | four-colour badge | 1 | 0.05 s, 5 paths, 84 anchors, 33 MB |
-| 16 Colors | photo-like | 1 | 0.10 s, 178 paths, 20466 anchors, 102 MB |
-| 16 Colors | four-colour badge | 1 | 0.05 s, 5 paths, 88 anchors, 33 MB |
-| Shades of Gray | photo-like | 1 | 0.08 s, 81 paths, 6698 anchors, 65 MB |
-| Shades of Gray | four-colour badge | 1 | 0.06 s, 10 paths, 733 anchors, 56 MB |
-| Black and White Logo | photo-like | 1 | 0.04 s, 71 paths, 5465 anchors, 9 MB |
-| Black and White Logo | four-colour badge | 1 | 0.02 s, 1 paths, 52 anchors, 8 MB |
-| Sketched Art | photo-like | 1 | 0.04 s, 5 paths, 2971 anchors, 9 MB |
-| Sketched Art | four-colour badge | 1 | 0.02 s, 2 paths, 131 anchors, 8 MB |
-| Silhouettes | photo-like | 1 | 0.04 s, 2 paths, 791 anchors, 11 MB |
-| Silhouettes | four-colour badge | 1 | 0.02 s, 1 paths, 25 anchors, 9 MB |
-| Line Art | photo-like | 1 | 0.04 s, 54 paths, 4421 anchors, 9 MB |
-| Line Art | four-colour badge | 1 | 0.02 s, 1 paths, 232 anchors, 8 MB |
-| Technical Drawing | photo-like | 1 | 0.04 s, 221 paths, 7680 anchors, 9 MB |
-| Technical Drawing | four-colour badge | 1 | 0.02 s, 1 paths, 52 anchors, 8 MB |
+| Default | photo-like | 1 | 0.04 s, 29 paths, 6701 anchors, 12 MB |
+| Default | four-colour badge | 1 | 0.02 s, 3 paths, 64 anchors, 12 MB |
+| High Fidelity Photo | photo-like | 1 | 0.21 s, 968 paths, 114383 anchors, 170 MB |
+| High Fidelity Photo | four-colour badge | 1 | 0.05 s, 6 paths, 172 anchors, 23 MB |
+| Low Fidelity Photo | photo-like | 1 | 0.11 s, 129 paths, 22929 anchors, 104 MB |
+| Low Fidelity Photo | four-colour badge | 1 | 0.05 s, 6 paths, 136 anchors, 23 MB |
+| 3 Colors | photo-like | 1 | 0.08 s, 9 paths, 3367 anchors, 18 MB |
+| 3 Colors | four-colour badge | 1 | 0.05 s, 4 paths, 88 anchors, 13 MB |
+| 6 Colors | photo-like | 1 | 0.08 s, 78 paths, 9008 anchors, 24 MB |
+| 6 Colors | four-colour badge | 1 | 0.05 s, 5 paths, 84 anchors, 12 MB |
+| 16 Colors | photo-like | 1 | 0.10 s, 178 paths, 20466 anchors, 31 MB |
+| 16 Colors | four-colour badge | 1 | 0.05 s, 5 paths, 88 anchors, 12 MB |
+| Shades of Gray | photo-like | 1 | 0.08 s, 81 paths, 6698 anchors, 41 MB |
+| Shades of Gray | four-colour badge | 1 | 0.06 s, 10 paths, 733 anchors, 34 MB |
+| Black and White Logo | photo-like | 1 | 0.04 s, 71 paths, 5047 anchors, 8 MB |
+| Black and White Logo | four-colour badge | 1 | 0.02 s, 1 paths, 47 anchors, 6 MB |
+| Sketched Art | photo-like | 1 | 0.04 s, 5 paths, 2880 anchors, 8 MB |
+| Sketched Art | four-colour badge | 1 | 0.02 s, 2 paths, 114 anchors, 6 MB |
+| Silhouettes | photo-like | 1 | 0.03 s, 2 paths, 573 anchors, 9 MB |
+| Silhouettes | four-colour badge | 1 | 0.02 s, 1 paths, 24 anchors, 6 MB |
+| Line Art | photo-like | 1 | 0.04 s, 54 paths, 4579 anchors, 8 MB |
+| Line Art | four-colour badge | 1 | 0.02 s, 1 paths, 38 anchors, 6 MB |
+| Technical Drawing | photo-like | 1 | 0.04 s, 221 paths, 6443 anchors, 8 MB |
+| Technical Drawing | four-colour badge | 1 | 0.02 s, 1 paths, 47 anchors, 6 MB |
 | Flat Logo | photo-like | 1 | refused after 0.09 s (not flat art), 40 MB |
-| Flat Logo | four-colour badge | 1 | 0.64 s, 5 paths, 78 anchors, 146 MB |
-| Default | photo-like | 4 | 0.18 s, 48 paths, 17801 anchors, 60 MB |
-| Default | four-colour badge | 4 | 0.09 s, 3 paths, 178 anchors, 64 MB |
-| High Fidelity Photo | photo-like | 4 | 0.72 s, 4475 paths, 341272 anchors, 981 MB |
-| High Fidelity Photo | four-colour badge | 4 | 0.24 s, 6 paths, 200 anchors, 152 MB |
-| Low Fidelity Photo | photo-like | 4 | 0.38 s, 304 paths, 61093 anchors, 568 MB |
-| Low Fidelity Photo | four-colour badge | 4 | 0.23 s, 6 paths, 152 anchors, 152 MB |
-| 3 Colors | photo-like | 4 | 0.28 s, 20 paths, 8453 anchors, 104 MB |
-| 3 Colors | four-colour badge | 4 | 0.18 s, 4 paths, 122 anchors, 84 MB |
-| 6 Colors | photo-like | 4 | 0.37 s, 115 paths, 23128 anchors, 168 MB |
-| 6 Colors | four-colour badge | 4 | 0.19 s, 5 paths, 92 anchors, 128 MB |
-| 16 Colors | photo-like | 4 | 0.32 s, 353 paths, 52749 anchors, 408 MB |
-| 16 Colors | four-colour badge | 4 | 0.19 s, 5 paths, 96 anchors, 128 MB |
-| Shades of Gray | photo-like | 4 | 0.29 s, 138 paths, 18794 anchors, 224 MB |
-| Shades of Gray | four-colour badge | 4 | 0.27 s, 10 paths, 1265 anchors, 220 MB |
-| Black and White Logo | photo-like | 4 | 0.20 s, 208 paths, 17188 anchors, 36 MB |
-| Black and White Logo | four-colour badge | 4 | 0.09 s, 1 paths, 64 anchors, 36 MB |
-| Sketched Art | photo-like | 4 | 0.20 s, 9 paths, 6884 anchors, 36 MB |
-| Sketched Art | four-colour badge | 4 | 0.09 s, 2 paths, 236 anchors, 36 MB |
-| Silhouettes | photo-like | 4 | 0.19 s, 2 paths, 1951 anchors, 44 MB |
-| Silhouettes | four-colour badge | 4 | 0.10 s, 1 paths, 32 anchors, 36 MB |
-| Line Art | photo-like | 4 | 0.19 s, 127 paths, 12091 anchors, 36 MB |
-| Line Art | four-colour badge | 4 | 0.09 s, 1 paths, 419 anchors, 36 MB |
-| Technical Drawing | photo-like | 4 | 0.20 s, 931 paths, 23132 anchors, 36 MB |
-| Technical Drawing | four-colour badge | 4 | 0.08 s, 1 paths, 64 anchors, 36 MB |
+| Flat Logo | four-colour badge | 1 | 0.65 s, 5 paths, 78 anchors, 146 MB |
+| Default | photo-like | 4 | 0.18 s, 48 paths, 15720 anchors, 49 MB |
+| Default | four-colour badge | 4 | 0.09 s, 3 paths, 72 anchors, 48 MB |
+| High Fidelity Photo | photo-like | 4 | 0.69 s, 4475 paths, 341272 anchors, 634 MB |
+| High Fidelity Photo | four-colour badge | 4 | 0.23 s, 6 paths, 200 anchors, 93 MB |
+| Low Fidelity Photo | photo-like | 4 | 0.35 s, 304 paths, 61093 anchors, 401 MB |
+| Low Fidelity Photo | four-colour badge | 4 | 0.22 s, 6 paths, 152 anchors, 94 MB |
+| 3 Colors | photo-like | 4 | 0.27 s, 20 paths, 8453 anchors, 73 MB |
+| 3 Colors | four-colour badge | 4 | 0.18 s, 4 paths, 122 anchors, 53 MB |
+| 6 Colors | photo-like | 4 | 0.26 s, 115 paths, 23128 anchors, 83 MB |
+| 6 Colors | four-colour badge | 4 | 0.18 s, 5 paths, 92 anchors, 46 MB |
+| 16 Colors | photo-like | 4 | 0.29 s, 353 paths, 52749 anchors, 109 MB |
+| 16 Colors | four-colour badge | 4 | 0.18 s, 5 paths, 96 anchors, 46 MB |
+| Shades of Gray | photo-like | 4 | 0.28 s, 138 paths, 18794 anchors, 158 MB |
+| Shades of Gray | four-colour badge | 4 | 0.26 s, 10 paths, 1265 anchors, 137 MB |
+| Black and White Logo | photo-like | 4 | 0.20 s, 208 paths, 13717 anchors, 32 MB |
+| Black and White Logo | four-colour badge | 4 | 0.08 s, 1 paths, 57 anchors, 24 MB |
+| Sketched Art | photo-like | 4 | 0.17 s, 9 paths, 5358 anchors, 32 MB |
+| Sketched Art | four-colour badge | 4 | 0.08 s, 2 paths, 196 anchors, 24 MB |
+| Silhouettes | photo-like | 4 | 0.19 s, 2 paths, 1457 anchors, 36 MB |
+| Silhouettes | four-colour badge | 4 | 0.08 s, 1 paths, 28 anchors, 24 MB |
+| Line Art | photo-like | 4 | 0.18 s, 127 paths, 11461 anchors, 32 MB |
+| Line Art | four-colour badge | 4 | 0.08 s, 1 paths, 42 anchors, 24 MB |
+| Technical Drawing | photo-like | 4 | 0.18 s, 931 paths, 21061 anchors, 32 MB |
+| Technical Drawing | four-colour badge | 4 | 0.08 s, 1 paths, 57 anchors, 24 MB |
 | Flat Logo | photo-like | 4 | refused after 0.10 s (not flat art), 40 MB |
-| Flat Logo | four-colour badge | 4 | 0.65 s, 5 paths, 69 anchors, 146 MB |
-| Default | photo-like | 16 | 1.04 s, 127 paths, 43656 anchors, 256 MB |
-| Default | four-colour badge | 16 | 0.47 s, 3 paths, 250 anchors, 240 MB |
-| High Fidelity Photo | photo-like | 16 | 2.85 s, 31125 paths, 1175671 anchors, 3856 MB |
-| High Fidelity Photo | four-colour badge | 16 | 1.11 s, 6 paths, 274 anchors, 576 MB |
-| Low Fidelity Photo | photo-like | 16 | 1.49 s, 2036 paths, 181832 anchors, 1972 MB |
-| Low Fidelity Photo | four-colour badge | 16 | 1.07 s, 6 paths, 187 anchors, 576 MB |
-| 3 Colors | photo-like | 16 | 1.22 s, 76 paths, 22878 anchors, 416 MB |
-| 3 Colors | four-colour badge | 16 | 0.82 s, 4 paths, 190 anchors, 336 MB |
-| 6 Colors | photo-like | 16 | 1.13 s, 470 paths, 60539 anchors, 672 MB |
-| 6 Colors | four-colour badge | 16 | 0.82 s, 5 paths, 126 anchors, 500 MB |
-| 16 Colors | photo-like | 16 | 1.18 s, 1973 paths, 145173 anchors, 1625 MB |
-| 16 Colors | four-colour badge | 16 | 0.84 s, 5 paths, 128 anchors, 504 MB |
-| Shades of Gray | photo-like | 16 | 1.48 s, 686 paths, 53872 anchors, 852 MB |
-| Shades of Gray | four-colour badge | 16 | 1.40 s, 9 paths, 2216 anchors, 800 MB |
-| Black and White Logo | photo-like | 16 | 1.15 s, 1128 paths, 52547 anchors, 144 MB |
-| Black and White Logo | four-colour badge | 16 | 0.47 s, 1 paths, 95 anchors, 128 MB |
-| Sketched Art | photo-like | 16 | 1.16 s, 15 paths, 16298 anchors, 144 MB |
-| Sketched Art | four-colour badge | 16 | 0.47 s, 2 paths, 414 anchors, 128 MB |
-| Silhouettes | photo-like | 16 | 1.34 s, 3 paths, 4516 anchors, 176 MB |
-| Silhouettes | four-colour badge | 16 | 0.53 s, 1 paths, 40 anchors, 144 MB |
-| Line Art | photo-like | 16 | 1.04 s, 713 paths, 43982 anchors, 144 MB |
-| Line Art | four-colour badge | 16 | 0.45 s, 1 paths, 707 anchors, 128 MB |
-| Technical Drawing | photo-like | 16 | 1.21 s, 4578 paths, 84475 anchors, 144 MB |
-| Technical Drawing | four-colour badge | 16 | 0.46 s, 1 paths, 95 anchors, 128 MB |
+| Flat Logo | four-colour badge | 4 | 0.68 s, 5 paths, 69 anchors, 146 MB |
+| Default | photo-like | 16 | 1.08 s, 127 paths, 34766 anchors, 199 MB |
+| Default | four-colour badge | 16 | 0.47 s, 3 paths, 88 anchors, 184 MB |
+| High Fidelity Photo | photo-like | 16 | 3.68 s, 31125 paths, 1175671 anchors, 880 MB |
+| High Fidelity Photo | four-colour badge | 16 | 1.05 s, 6 paths, 274 anchors, 257 MB |
+| Low Fidelity Photo | photo-like | 16 | 1.78 s, 2036 paths, 181832 anchors, 754 MB |
+| Low Fidelity Photo | four-colour badge | 16 | 1.07 s, 6 paths, 187 anchors, 257 MB |
+| 3 Colors | photo-like | 16 | 1.17 s, 76 paths, 22878 anchors, 290 MB |
+| 3 Colors | four-colour badge | 16 | 0.82 s, 4 paths, 190 anchors, 205 MB |
+| 6 Colors | photo-like | 16 | 1.09 s, 470 paths, 60539 anchors, 298 MB |
+| 6 Colors | four-colour badge | 16 | 0.81 s, 5 paths, 126 anchors, 184 MB |
+| 16 Colors | photo-like | 16 | 1.09 s, 1973 paths, 145173 anchors, 303 MB |
+| 16 Colors | four-colour badge | 16 | 0.83 s, 5 paths, 128 anchors, 184 MB |
+| Shades of Gray | photo-like | 16 | 1.61 s, 686 paths, 53872 anchors, 407 MB |
+| Shades of Gray | four-colour badge | 16 | 1.35 s, 9 paths, 2216 anchors, 270 MB |
+| Black and White Logo | photo-like | 16 | 1.01 s, 1128 paths, 45117 anchors, 129 MB |
+| Black and White Logo | four-colour badge | 16 | 0.36 s, 1 paths, 69 anchors, 88 MB |
+| Sketched Art | photo-like | 16 | 0.99 s, 15 paths, 11568 anchors, 128 MB |
+| Sketched Art | four-colour badge | 16 | 0.39 s, 2 paths, 361 anchors, 88 MB |
+| Silhouettes | photo-like | 16 | 1.30 s, 3 paths, 3358 anchors, 144 MB |
+| Silhouettes | four-colour badge | 16 | 0.41 s, 1 paths, 32 anchors, 95 MB |
+| Line Art | photo-like | 16 | 0.95 s, 713 paths, 36212 anchors, 129 MB |
+| Line Art | four-colour badge | 16 | 0.34 s, 1 paths, 49 anchors, 88 MB |
+| Technical Drawing | photo-like | 16 | 1.09 s, 4578 paths, 79049 anchors, 130 MB |
+| Technical Drawing | four-colour badge | 16 | 0.37 s, 1 paths, 69 anchors, 88 MB |
 | Flat Logo | photo-like | 16 | refused after 0.11 s (not flat art), 40 MB |
-| Flat Logo | four-colour badge | 16 | 0.69 s, 5 paths, 67 anchors, 146 MB |
+| Flat Logo | four-colour badge | 16 | 0.67 s, 5 paths, 67 anchors, 146 MB |

 ## Revision history

 | date | change |
 |:--|:--|
+| 2026-10-13 | Thin lines: black and white read against the image's darkest black and the paper near each edge |
+| 2026-10-13 | Memory: layers traced within the box of their pixels and a few at a time (16 megapixel photo: 3.9 GB to 0.9 GB) |
 | 2026-10-13 | Shared edges: outlines are cut at their junctions and each piece is fitted once, the same from either side |
 | 2026-10-13 | Photos: continuous-tone images are smoothed within their tones before quantising, and stacked layers go by lightness |
 | 2026-10-13 | The palette: made of the picture's own colours, noise-made colours merged, blend pixels settled, cuts where colours differ most, colours compared in Oklab |
Author	SHA1	Message	Date
bflatastic	c2ed31dc4c	Image Trace: thin lines in blurred and scanned art keep smooth edges Black and White read every pixel as a blend of "black" and "white", and took for those the mean luminance of the image's black and white pixels. In blurred or scanned line art most black pixels are part paper, so the mean black was a gray: the middle of every line counted as more than all ink, and by how much changed as the line crossed the pixel rows, which put a ripple on its edges that the fit then followed with anchors. - Black is the image's darkest black (the 2nd percentile of its black pixels' luminance). - White is the lightest pixel within a few pixels of each crack: the paper as it is there. A scan's paper is darker in one corner than in another, and read against the image's lightest white it counted as part ink. On each preset's own inputs, all sizes and variants (docs/image-trace-quality.md), before -> after: - Line Art: 78 -> 46 anchors, outlines 0.093 -> 0.055 px off on average (blurred lines 168 -> 53 anchors, scanned 199 -> 70); before sub-pixel edges it was 25 anchors and 0.158 px off - Technical Drawing: 56 -> 46 anchors, 0.092 -> 0.084 px off - Sketched Art: 0.197 -> 0.186 px off; Default 0.092 -> 0.090; Black and White Logo 0.063 -> 0.059 with 27 -> 29 anchors Not kept: reading lines up to six pixels deep by their ink's centroid and width, and a looser tolerance for straight runs, neither of which measured better.	2026-10-13 07:27:56 +07:00
BFlat	d9e44350d2	Merge pull request #1548 from storytold/fix/1529-fontconfig-dirs Fix #1529: Linux reads the font folders fontconfig is set up with	2026-10-13 07:14:31 +07:00
BFlat	0f4de5b98e	Merge pull request #1547 from storytold/fix/1512-corners-smooth Fix #1512: round corners next to curves stay inside the corner, and the Smooth tool smooths what is under the drag	2026-10-13 07:14:14 +07:00
BFlat	a971b5b70e	Merge pull request #1546 from storytold/u/trace-memory Image Trace: a 16 megapixel photo is traced in 0.9 GB, not 3.9	2026-10-13 07:14:01 +07:00
BFlat	6beaa89be2	Merge pull request #1531 from switch87/fix/1527-textpath-basic-shapes SVG import: <textPath> follows basic shapes (circle, ellipse, rect, line, polyline, polygon)	2026-10-13 07:13:45 +07:00
BFlat	40b02f479b	Merge pull request #1530 from EricKuck/fix/ai-gradient-stop-order AI import: gradient stops listed upwards aren't reversed, so a midpoint stays on the stop that starts its part of the ramp	2026-10-13 07:13:29 +07:00
BFlat	afda1cd846	Merge pull request #1528 from fortesnow/ai-off-page-art-overlap .ai import: a page's art past its artboard no longer lies over the page before it	2026-10-13 07:13:12 +07:00
BFlat	a7c6644691	Merge pull request #1545 from storytold/docs/progress-1013b Docs: ROADMAP 2026-10-12 adds #1474–#1525 (late merges of the day)	2026-10-13 07:12:46 +07:00
bflatastic	c9fac95760	Image Trace: a 16 megapixel photo is traced in 0.9 GB, not 3.9 Every colour layer took a mask, component labels, a fill stack and an edge map the size of the whole image, and as many layers were traced at once as the machine has cores. - A layer is traced within the box its pixels lie in. - The stack that fills components holds `u32` indices (a mask has at most 64 million pixels). - Layers are traced as many at a time as fit in half a gigabyte (about ten bytes a pixel of the largest layer's box each), on however many cores. Peak memory above the image itself, photo-like image (docs/image-trace-quality.md), before -> after: - 16 megapixels: High Fidelity Photo 3,856 -> 880 MB (2.85 -> 3.65 s), Low Fidelity Photo 1,972 -> 754 MB (1.49 -> 1.80 s), 16 Colors 1,625 -> 298 MB, Shades of Gray 852 -> 407 MB, Default 256 -> 199 MB - 4 megapixels: High Fidelity Photo 981 -> 643 MB, 16 Colors 408 -> 122 MB, times unchanged The traces are the same, path for path.	2026-10-13 06:38:10 +07:00