diff --git a/crates/aep/src/container/effect_map.rs b/crates/aep/src/container/effect_map.rs
index 49a53d2e7..29274fc68 100644
--- a/crates/aep/src/container/effect_map.rs
+++ b/crates/aep/src/container/effect_map.rs
@@ -38,6 +38,19 @@ pub enum Conv {
     Skip,
 }
 
+impl Conv {
+    /// For a number (`Percent`, `Plain`, `Factor`): what a stored value is multiplied by to give
+    /// the value here. `None` for every other conversion.
+    pub fn number_scale(self) -> Option<f64> {
+        match self {
+            Conv::Percent { valid_max } => Some(100.0 / valid_max),
+            Conv::Plain { .. } => Some(1.0),
+            Conv::Factor { factor, .. } => Some(factor),
+            _ => None,
+        }
+    }
+}
+
 // After Effects' popup items as the corpus stores them (`pdnm`).
 /// 368.
 pub const RAMP_SHAPE: &[&str] = &["Linear Ramp", "Radial Ramp"];
diff --git a/crates/aep/src/export/fx_defs.rs b/crates/aep/src/export/fx_defs.rs
index e8464bada..338e00fc5 100644
--- a/crates/aep/src/export/fx_defs.rs
+++ b/crates/aep/src/export/fx_defs.rs
@@ -707,3 +707,99 @@ pub(crate) static FX_DEFS: &[FxDef] = &[
         p(BUILT_IN, 9, &[], None, None, None, 0x00000000),
     ]),
 ];
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::container::effect_map::by_match_name;
+    use effectcraft_project::ParamUi;
+
+    /// Effect parameters whose hard range (`ParamUi::Slider` min..max, which `prop.set` and the
+    /// value editors clamp to) is still narrower than After Effects' recorded valid range, each
+    /// with the open issue that tracks it: (effect, parameter, issue). Remove a row when its
+    /// issue is fixed; the test fails on a row that is no longer needed.
+    #[rustfmt::skip]
+    const KNOWN_NARROWER: &[(&str, &str, u32)] = &[
+        ("ec.blur.gaussian", "blurriness", 3460),
+        ("ec.blur.fastbox", "radius", 3461),
+        ("ec.blur.channel", "redBlurriness", 3462),
+        ("ec.blur.channel", "greenBlurriness", 3462),
+        ("ec.blur.channel", "blueBlurriness", 3462),
+        ("ec.blur.channel", "alphaBlurriness", 3462),
+        ("ec.obsolete.gaussianlegacy", "blurriness", 3463),
+        ("ec.perspective.dropshadow", "softness", 3464),
+        ("ec.blur.compound", "maximumBlur", 3465),
+        ("ec.blur.sharpen", "amount", 3466),
+        ("ec.blur.radial", "amount", 3467),
+        ("ec.blur.ccradial", "amount", 3468),
+        ("ec.distort.turbulentdisplace", "amount", 3469),
+        ("ec.time.pixelmotionblur", "shutterAngle", 3481),
+        ("ec.time.pixelmotionblur", "shutterSamples", 3482),
+        ("ec.noise.fractal", "subSettings/subInfluence", 3485),
+        ("ec.noise.fractal", "subSettings/subScaling", 3486),
+        ("ec.distort.ccpowerpin", "expandTop", 3492),
+        ("ec.distort.ccpowerpin", "expandLeft", 3492),
+        ("ec.distort.ccpowerpin", "expandRight", 3492),
+        ("ec.distort.ccpowerpin", "expandBottom", 3492),
+    ];
+
+    /// `a` is at most `b`, allowing for the `f32` the recorded bounds were read from.
+    fn at_most(a: f64, b: f64) -> bool {
+        a <= b + 1e-6 * a.abs().max(b.abs()).max(1.0)
+    }
+
+    /// Every effect parameter the .aep table maps to a recorded After Effects definition accepts
+    /// at least After Effects' valid range, converted to EffectCraft's units the way the importer
+    /// converts values (`Conv::number_scale`). Only `ParamUi::Slider` limits values (`prop.set`,
+    /// the Effect Controls and Timeline editors); other controls take any number. A mapping with
+    /// a declared narrower range (`ParamMap::limit`) must match the effect's range instead.
+    #[test]
+    fn effect_hard_ranges_cover_recorded_after_effects_ranges() {
+        let mut problems = Vec::new();
+        let mut narrower = Vec::new();
+        for fx in FX_DEFS {
+            let Some(map) = by_match_name(fx.match_name) else { continue };
+            let Some(spec) = effectcraft_effects::find(map.effect) else {
+                problems.push(format!("{}: no effect {}", fx.match_name, map.effect));
+                continue;
+            };
+            for pm in map.params {
+                let Some(scale) = pm.conv.number_scale() else { continue };
+                let at = format!("{} {}", map.effect, pm.target);
+                let Some(ps) = spec.params.iter().find(|p| p.id == pm.target) else {
+                    problems.push(format!("{at}: not a parameter of the effect"));
+                    continue;
+                };
+                // Other controls take any number.
+                let ParamUi::Slider { min, max, .. } = &ps.ui else { continue };
+                let Some(def) = fx.params.get(pm.index) else {
+                    problems.push(format!("{at}: no recorded definition at parT {}", pm.index));
+                    continue;
+                };
+                let (Some(lo), Some(hi)) = (def.valid_min, def.valid_max) else {
+                    problems.push(format!("{at}: no recorded valid range"));
+                    continue;
+                };
+                let (lo, hi) = (lo * scale, hi * scale);
+                if let Some(limit) = pm.limit {
+                    if limit != (*min, *max) {
+                        problems.push(format!("{at}: declared limit {limit:?} is not the effect's range {min}..{max}"));
+                    }
+                } else if !(at_most(*min, lo) && at_most(hi, *max)) {
+                    narrower.push((map.effect, pm.target, format!("{at}: {min}..{max} excludes After Effects' {lo}..{hi}")));
+                }
+            }
+        }
+        for (effect, param, why) in &narrower {
+            if !KNOWN_NARROWER.iter().any(|(e, p, _)| e == effect && p == param) {
+                problems.push(why.clone());
+            }
+        }
+        for (effect, param, issue) in KNOWN_NARROWER {
+            if !narrower.iter().any(|(e, p, _)| e == effect && p == param) {
+                problems.push(format!("{effect} {param}: covers After Effects' range now (or is not mapped); remove it from KNOWN_NARROWER (#{issue})"));
+            }
+        }
+        assert!(problems.is_empty(), "{}", problems.join("\n"));
+    }
+}
diff --git a/crates/aep/src/import/effects.rs b/crates/aep/src/import/effects.rs
index 45ea70840..11d975cd8 100644
--- a/crates/aep/src/import/effects.rs
+++ b/crates/aep/src/import/effects.rs
@@ -259,23 +259,12 @@ pub(crate) fn import_mapped(p: &EffectParam<'_, '_>, m: &ParamMap, cx: &LayerCtx
         Conv::Checkbox => Kind::EffectBool,
         // Handled above.
         Conv::LayerRef { .. } | Conv::Skip => return,
-        Conv::Percent { valid_max } => {
+        Conv::Percent { valid_max } | Conv::Plain { valid_max } | Conv::Factor { valid_max, .. } => {
             if !checked(valid_max, col) {
                 return;
             }
-            Kind::EffectNumber(100.0 / valid_max)
-        }
-        Conv::Plain { valid_max } => {
-            if !checked(valid_max, col) {
-                return;
-            }
-            Kind::EffectNumber(1.0)
-        }
-        Conv::Factor { valid_max, factor } => {
-            if !checked(valid_max, col) {
-                return;
-            }
-            Kind::EffectNumber(factor)
+            let Some(scale) = m.conv.number_scale() else { return };
+            Kind::EffectNumber(scale)
         }
     };
     // Grouped parameters are addressed by path (`master/exposure`).
diff --git a/crates/effects/src/color2.rs b/crates/effects/src/color2.rs
index 6639e649e..9df44d76f 100644
--- a/crates/effects/src/color2.rs
+++ b/crates/effects/src/color2.rs
@@ -252,10 +252,18 @@ impl Lv {
         if clip_w {
             t = t.min(1.0);
         }
-        self.ob + (self.ow - self.ob) * crate::color_fx::levels_gamma(t, self.g.max(0.01))
+        let curve = crate::color_fx::levels_gamma(t, self.g.max(0.01)).clamp(-LEVELS_IC_CURVE_LIMIT, LEVELS_IC_CURVE_LIMIT);
+        self.ob + (self.ow - self.ob) * curve
     }
 }
 
+/// How far Levels (Individual Controls)' curve may reach: with gamma down to 0 (rendered as 0.01,
+/// an exponent of 100) an HDR value a few times Input White overflows `f32`, and an infinite curve
+/// times an empty output range is NaN. 1e30 times the widest output range (2e4) is still finite
+/// (`f32::MAX` is 3.4e38), and every curve that was finite before stays as it was below it. The
+/// GPU (`fxt_lv`) uses the same.
+const LEVELS_IC_CURVE_LIMIT: f32 = 1e30;
+
 fn levels_ic(ctx: &EffectCtx, mut b: Buf) -> Buf {
     let lv = LV_IDS.map(|ids| Lv {
         ib: ctx.params.f(ids[0]) as f32,
@@ -978,11 +986,14 @@ fn cc_kernel(ctx: &EffectCtx, mut b: Buf) -> Buf {
 pub fn specs() -> Vec<EffectSpec> {
     let mut lv_params = Vec::new();
     for (ids, names) in LV_IDS.iter().zip(LV_NAMES.iter()) {
-        lv_params.push(p(ids[0], names[0], num(0.0), slider(-1.0, 2.0, 0.0, 1.0, 3)));
-        lv_params.push(p(ids[1], names[1], num(1.0), slider(-1.0, 2.0, 0.0, 1.0, 3)));
-        lv_params.push(p(ids[2], names[2], num(1.0), slider(0.1, 10.0, 0.1, 3.0, 2)));
-        lv_params.push(p(ids[3], names[3], num(0.0), slider(-1.0, 2.0, 0.0, 1.0, 3)));
-        lv_params.push(p(ids[4], names[4], num(1.0), slider(-1.0, 2.0, 0.0, 1.0, 3)));
+        // After Effects' valid ranges (#3487-#3491): levels -10000..10000 and gamma from 0 (the
+        // renderer floors it at 0.01); gamma keeps its wider maximum. The sliders stay 0..1.
+        let level = || slider(-10000.0, 10000.0, 0.0, 1.0, 3);
+        lv_params.push(p(ids[0], names[0], num(0.0), level()));
+        lv_params.push(p(ids[1], names[1], num(1.0), level()));
+        lv_params.push(p(ids[2], names[2], num(1.0), slider(0.0, 10.0, 0.1, 3.0, 2)));
+        lv_params.push(p(ids[3], names[3], num(0.0), level()));
+        lv_params.push(p(ids[4], names[4], num(1.0), level()));
     }
     lv_params.push(p("clipToOutputBlack", "Clip To Output Black", Value::Enum(2), popup(&crate::color_fx::LEVELS_CLIP)));
     lv_params.push(p("clipToOutputWhite", "Clip To Output White", Value::Enum(2), popup(&crate::color_fx::LEVELS_CLIP)));
diff --git a/crates/effects/src/color2/tests.rs b/crates/effects/src/color2/tests.rs
index 5f57692a0..76338dd98 100644
--- a/crates/effects/src/color2/tests.rs
+++ b/crates/effects/src/color2/tests.rs
@@ -270,6 +270,39 @@ fn levels_ic_clip_popups() {
     assert!(run("ec.color.levelsic", &img, &off).data[0][0] > 1.5);
 }
 
+/// #3487-#3491: over After Effects' valid ranges (levels ±10000, gamma from 0) the output stays
+/// finite: gamma 0 renders as 0.01, whose curve on an HDR value overflows `f32` unbounded.
+#[test]
+fn levels_ic_stays_finite_over_the_whole_range() {
+    let img = Image::filled(2, 2, [3.0, 0.5, -2.0, 1.0]);
+    for (ib, iw, ob, ow) in [
+        (0.0, 1.0, 0.0, 1.0),
+        (0.0, 1.0, 1.0, 1.0),
+        (-10000.0, 10000.0, -10000.0, 10000.0),
+        (10000.0, -10000.0, 10000.0, -10000.0),
+        (0.0, 1e-3, -10000.0, 10000.0),
+    ] {
+        let lv = [
+            ("rgb/rgbInBlack", num(ib)),
+            ("rgb/rgbInWhite", num(iw)),
+            ("rgb/rgbGamma", num(0.0)),
+            ("rgb/rgbOutBlack", num(ob)),
+            ("rgb/rgbOutWhite", num(ow)),
+            ("clipToOutputBlack", Value::Enum(0)),
+            ("clipToOutputWhite", Value::Enum(0)),
+        ];
+        let out = run("ec.color.levelsic", &img, &lv);
+        assert!(out.data.iter().flatten().all(|v| v.is_finite()), "{ib} {iw} {ob} {ow}: {:?}", out.data[0]);
+    }
+    // The bound only stops the overflow: an HDR value that was finite before keeps its level
+    // (gamma 0.1 at 4 x Input White: 4^10).
+    let bright = run("ec.color.levelsic", &Image::filled(1, 1, [4.0, 4.0, 4.0, 1.0]), &[("rgb/rgbGamma", num(0.1)), ("clipToOutputWhite", Value::Enum(0))]);
+    assert_eq!(bright.data[0][0], 4.0f32.powf(10.0));
+    // Gamma 0 is the limit of a small gamma: below Input White the curve goes to 0.
+    let dark = run("ec.color.levelsic", &Image::filled(1, 1, [0.5, 0.5, 0.5, 1.0]), &[("rgb/rgbGamma", num(0.0))]);
+    assert!(dark.data[0][0] < 1e-6, "{:?}", dark.data[0]);
+}
+
 /// A host whose other layers and other frames are a fixed image.
 struct ImgHost(Image);
 impl crate::EffectHost for ImgHost {
diff --git a/crates/effects/src/color3.rs b/crates/effects/src/color3.rs
index d0d398100..6548fdbdb 100644
--- a/crates/effects/src/color3.rs
+++ b/crates/effects/src/color3.rs
@@ -809,7 +809,7 @@ pub fn specs() -> Vec<EffectSpec> {
             "Change Color",
             vec![
                 p("view", "View", Value::Enum(0), popup(&["Corrected Layer", "Color Correction Mask"])),
-                p("hueTransform", "Hue Transform", num(0.0), slider(-360.0, 360.0, -180.0, 180.0, 1)),
+                p("hueTransform", "Hue Transform", num(0.0), slider(-1800.0, 1800.0, -180.0, 180.0, 1)),
                 p("lightnessTransform", "Lightness Transform", num(0.0), bipolar()),
                 p("saturationTransform", "Saturation Transform", num(0.0), bipolar()),
                 p("colorToChange", "Color To Change", col(0.8, 0.2, 0.2), ParamUi::Color),
diff --git a/crates/effects/src/distort.rs b/crates/effects/src/distort.rs
index 610f73f4c..59d4aad01 100644
--- a/crates/effects/src/distort.rs
+++ b/crates/effects/src/distort.rs
@@ -506,8 +506,8 @@ pub fn specs() -> Vec<EffectSpec> {
                 p("anchor", "Anchor Point", pt(0.5, 0.5), ParamUi::Point),
                 p("position", "Position", pt(0.5, 0.5), ParamUi::Point),
                 p("uniform", "Uniform Scale", Value::Bool(true), ParamUi::Checkbox),
-                p("scaleHeight", "Scale Height", num(100.0), slider(-10000.0, 10000.0, 0.0, 600.0, 1)),
-                p("scaleWidth", "Scale Width", num(100.0), slider(-10000.0, 10000.0, 0.0, 600.0, 1)),
+                p("scaleHeight", "Scale Height", num(100.0), slider(-30000.0, 30000.0, 0.0, 600.0, 1)),
+                p("scaleWidth", "Scale Width", num(100.0), slider(-30000.0, 30000.0, 0.0, 600.0, 1)),
                 p("skew", "Skew", num(0.0), slider(-70.0, 70.0, -70.0, 70.0, 1)),
                 p("skewAxis", "Skew Axis", num(0.0), ParamUi::Angle),
                 p("rotation", "Rotation", num(0.0), ParamUi::Angle),
diff --git a/crates/effects/src/distort2.rs b/crates/effects/src/distort2.rs
index bbd8738a8..611cb6dcf 100644
--- a/crates/effects/src/distort2.rs
+++ b/crates/effects/src/distort2.rs
@@ -743,7 +743,7 @@ pub fn specs() -> Vec<EffectSpec> {
                 p("evolution", "Evolution", num(0.0), ParamUi::Angle),
                 p("evolutionOptions/cycleEvolution", "Cycle Evolution", Value::Bool(false), ParamUi::Checkbox),
                 p("evolutionOptions/cycle", "Cycle (in Revolutions)", num(1.0), slider(1.0, 1000.0, 1.0, 20.0, 0)),
-                p("evolutionOptions/randomSeed", "Random Seed", num(0.0), slider(0.0, 10000.0, 0.0, 1000.0, 0)),
+                p("evolutionOptions/randomSeed", "Random Seed", num(0.0), slider(0.0, 100000.0, 0.0, 1000.0, 0)),
                 p("pinning", "Pinning", Value::Enum(1), popup(&TURBULENT_PINNING)),
                 p("resizeLayer", "Resize Layer", Value::Bool(false), ParamUi::Checkbox),
             ],
diff --git a/crates/effects/src/generate.rs b/crates/effects/src/generate.rs
index ae0d61861..d8d47a7c7 100644
--- a/crates/effects/src/generate.rs
+++ b/crates/effects/src/generate.rs
@@ -121,11 +121,17 @@ pub fn four_color_softening(blend: f64, scale: f64) -> f64 {
     (b * b).max(1e-6)
 }
 
+/// 4-Color Gradient's Jitter (percent, up to After Effects' 500 %) as the dither's strength: 1 at
+/// 100 %, a few code values of noise per unit.
+pub fn four_color_jitter(jitter: f64) -> f32 {
+    (jitter / 100.0).clamp(0.0, 5.0) as f32
+}
+
 fn four_color(ctx: &EffectCtx, mut b: Buf) -> Buf {
     let pts: Vec<((f64, f64), [f32; 4])> =
         (1..=4).map(|i| (b.to_px(ctx.params.v2(&format!("positionsColors/point{i}"))), ctx.params.color(&format!("positionsColors/color{i}")))).collect();
     let k = four_color_softening(ctx.params.f("blend"), b.scale);
-    let jitter = (ctx.params.f("jitter") / 100.0).clamp(0.0, 1.0) as f32;
+    let jitter = four_color_jitter(ctx.params.f("jitter"));
     let op = ctx.params.f("opacity") as f32 / 100.0;
     let mode = ctx.params.e("blendingMode");
     let seed = ctx.seed;
@@ -349,8 +355,9 @@ pub fn specs() -> Vec<EffectSpec> {
                 p("positionsColors/color3", "Color 3", col(1.0, 0.0, 1.0), ParamUi::Color),
                 p("positionsColors/point4", "Point 4", pt(0.9, 0.9), ParamUi::Point),
                 p("positionsColors/color4", "Color 4", col(0.0, 0.0, 1.0), ParamUi::Color),
-                p("blend", "Blend", num(100.0), slider(1.0, 1000.0, 1.0, 1000.0, 1)),
-                p("jitter", "Jitter", num(0.0), slider(0.0, 100.0, 0.0, 100.0, 1)),
+                // After Effects' valid ranges (#3478, #3479); Blend keeps its lower minimum (1, not 5).
+                p("blend", "Blend", num(100.0), slider(1.0, 10000.0, 1.0, 1000.0, 1)),
+                p("jitter", "Jitter", num(0.0), slider(0.0, 500.0, 0.0, 100.0, 1)),
                 p("opacity", "Opacity", num(100.0), slider(0.0, 100.0, 0.0, 100.0, 1)),
                 p("blendingMode", "Blending Mode", Value::Enum(0), popup(&GEN_BLEND_MODES[..18])),
             ],
@@ -384,7 +391,7 @@ pub fn specs() -> Vec<EffectSpec> {
                 p("corner", "Corner", pt(0.1, 0.1), ParamUi::Point),
                 p("width", "Width", num(64.0), slider(1.0, 4000.0, 1.0, 400.0, 1)),
                 p("height", "Height", num(64.0), slider(1.0, 4000.0, 1.0, 400.0, 1)),
-                p("border", "Border", num(2.0), slider(0.0, 400.0, 0.0, 40.0, 1)),
+                p("border", "Border", num(2.0), slider(0.0, 2000.0, 0.0, 40.0, 1)),
                 p("feather/featherWidth", "Width", num(0.0), slider(0.0, 1000.0, 0.0, 50.0, 1)),
                 p("feather/featherHeight", "Height", num(0.0), slider(0.0, 1000.0, 0.0, 50.0, 1)),
                 p("invertGrid", "Invert Grid", Value::Bool(false), ParamUi::Checkbox),
@@ -465,6 +472,21 @@ mod generator_tests {
         }
     }
 
+    /// #3479: Jitter goes up to After Effects' 500 %, and more jitter dithers more (the dither
+    /// stopped growing at 100 %).
+    #[test]
+    fn four_color_jitter_grows_up_to_five_hundred_percent() {
+        let img = Image::filled(32, 32, [0.0, 0.0, 0.0, 1.0]);
+        let spread = |jitter: f64| {
+            let o = run_fx("ec.generate.fourcolor", &[("jitter", num(jitter))], img.clone(), 0.0, EffectEnv::default()).img;
+            let flat = run_fx("ec.generate.fourcolor", &[], img.clone(), 0.0, EffectEnv::default()).img;
+            o.data.iter().zip(&flat.data).map(|(a, b)| (a[0] - b[0]).abs()).fold(0.0f32, f32::max)
+        };
+        let (at100, at500) = (spread(100.0), spread(500.0));
+        assert!(at100 > 0.0 && at500 > 4.0 * at100, "{at100} {at500}");
+        assert!(at500 < 0.2, "a few code values: {at500}");
+    }
+
     /// After Effects 2026, 4-Color Gradient defaults (yellow, green, magenta, blue at 10 % / 90 %
     /// of a 1920 × 1080 layer) at Blend 100 and 300, here on a tenth-size layer with Blend 10
     /// and 30 (the weights scale with the layer): colours at AE pixels (10x + 5, 10y + 5).
diff --git a/crates/effects/src/generate2.rs b/crates/effects/src/generate2.rs
index ad80cb9cd..6bf5443fc 100644
--- a/crates/effects/src/generate2.rs
+++ b/crates/effects/src/generate2.rs
@@ -1111,8 +1111,8 @@ pub fn specs() -> Vec<EffectSpec> {
                 p("endPoint", "Ending Point", pt(0.75, 0.5), ParamUi::Point),
                 p("length", "Length", num(25.0), pct()),
                 p("time", "Time", num(0.0), pct()),
-                p("startThickness", "Starting Thickness", num(8.0), slider(0.0, 1000.0, 0.0, 100.0, 1)),
-                p("endThickness", "Ending Thickness", num(8.0), slider(0.0, 1000.0, 0.0, 100.0, 1)),
+                p("startThickness", "Starting Thickness", num(8.0), slider(0.0, 4000.0, 0.0, 100.0, 1)),
+                p("endThickness", "Ending Thickness", num(8.0), slider(0.0, 4000.0, 0.0, 100.0, 1)),
                 p("softness", "Softness", num(20.0), pct()),
                 p("insideColor", "Inside Color", col(1.0, 1.0, 1.0), ParamUi::Color),
                 p("outsideColor", "Outside Color", col(0.4, 0.4, 1.0), ParamUi::Color),
diff --git a/crates/effects/src/lib.rs b/crates/effects/src/lib.rs
index 26b0008ef..f9d8f97e8 100644
--- a/crates/effects/src/lib.rs
+++ b/crates/effects/src/lib.rs
@@ -100,7 +100,7 @@ pub use sim3::{PgBlit, PgPlan, playground_plan, playground_state};
 pub use stylize2::strobe_on;
 // CPU helpers the GPU kernels share (effectcraft-gpu).
 pub use blur2::{CAMERA_LENS_MAX_RADIUS, camera_lens_plain, camera_lens_radius, camera_lens_spans, radial_fast_pad};
-pub use generate::{four_color_softening, gen_mode};
+pub use generate::{four_color_jitter, four_color_softening, gen_mode};
 pub use generate2::pattern_kind as cell_pattern_kind;
 pub use generate2::{BoltSeg, Contour, Ghost, RadioPlan, Wave, flare_ghosts, lightning_segments, radio_plan};
 pub use generate3::{
diff --git a/crates/effects/src/misc.rs b/crates/effects/src/misc.rs
index 65951ad97..9c7131657 100644
--- a/crates/effects/src/misc.rs
+++ b/crates/effects/src/misc.rs
@@ -919,7 +919,7 @@ pub fn specs() -> Vec<EffectSpec> {
                 p("startAngle", "Start Angle", num(0.0), ParamUi::Angle),
                 p("center", "Wipe Center", Value::Vec2([0.5, 0.5]), ParamUi::Point),
                 p("wipe", "Wipe", Value::Enum(0), popup(&["Clockwise", "Counterclockwise", "Both"])),
-                p("feather", "Feather", num(0.0), slider(0.0, 360.0, 0.0, 50.0, 1)),
+                p("feather", "Feather", num(0.0), slider(0.0, 32000.0, 0.0, 50.0, 1)),
             ],
             radial_wipe,
         ),
@@ -930,8 +930,8 @@ pub fn specs() -> Vec<EffectSpec> {
             vec![
                 p("completion", "Transition Completion", num(0.0), slider(0.0, 100.0, 0.0, 100.0, 0)),
                 p("direction", "Direction", num(90.0), ParamUi::Angle),
-                p("width", "Width", num(30.0), slider(2.0, 1000.0, 2.0, 200.0, 0)),
-                p("feather", "Feather", num(0.0), slider(0.0, 100.0, 0.0, 100.0, 1)),
+                p("width", "Width", num(30.0), slider(1.0, 32000.0, 2.0, 200.0, 0)),
+                p("feather", "Feather", num(0.0), slider(0.0, 32000.0, 0.0, 100.0, 1)),
             ],
             venetian,
         ),
diff --git a/crates/effects/src/noise.rs b/crates/effects/src/noise.rs
index 09217f831..fde24b537 100644
--- a/crates/effects/src/noise.rs
+++ b/crates/effects/src/noise.rs
@@ -766,10 +766,12 @@ pub fn specs() -> Vec<EffectSpec> {
     let hls_common = || {
         vec![
             p("noise", "Noise", Value::Enum(0), popup(&["Uniform", "Squared", "Grain"])),
-            p("hue", "Hue", num(0.0), pct()),
-            p("lightness", "Lightness", num(0.0), pct()),
-            p("saturation", "Saturation", num(0.0), pct()),
-            p("grainSize", "Grain Size", num(1.0), slider(0.1, 100.0, 0.5, 10.0, 2)),
+            // After Effects' valid ranges (#3483, #3484): the amounts go to 1000 %, Grain Size
+            // down to 0 (the renderer floors it at 0.1 px) and keeps its wider maximum.
+            p("hue", "Hue", num(0.0), slider(0.0, 1000.0, 0.0, 100.0, 1)),
+            p("lightness", "Lightness", num(0.0), slider(0.0, 1000.0, 0.0, 100.0, 1)),
+            p("saturation", "Saturation", num(0.0), slider(0.0, 1000.0, 0.0, 100.0, 1)),
+            p("grainSize", "Grain Size", num(1.0), slider(0.0, 100.0, 0.5, 10.0, 2)),
         ]
     };
     let mut hls = hls_common();
@@ -967,6 +969,32 @@ mod tests {
         assert_eq!(still.img, img);
     }
 
+    /// #3483, #3484: amounts above 100 % keep adding noise, and Grain Size 0 renders (floored at
+    /// 0.1 px) with finite output, for both effects.
+    #[test]
+    fn noise_hls_takes_after_effects_ranges() {
+        let mut img = Image::new(16, 16);
+        for (i, p) in img.data.iter_mut().enumerate() {
+            *p = premul([0.6, 0.3, (i % 7) as f32 / 7.0], 1.0);
+        }
+        for id in ["ec.noise.noisehls", "ec.noise.noisehlsauto"] {
+            for (param, lo, hi) in [("hue", 0.0, 1000.0), ("lightness", 0.0, 1000.0), ("saturation", 0.0, 1000.0), ("grainSize", 0.0, 100.0)] {
+                let ui = &crate::find(id).unwrap().params.iter().find(|p| p.id == param).unwrap().ui;
+                assert!(matches!(ui, ParamUi::Slider { min, max, .. } if *min == lo && *max == hi), "{id} {param}: {ui:?}");
+            }
+            let at = |amount: f64, grain: f64| {
+                let vals =
+                    [("noise", Value::Enum(2)), ("hue", num(amount)), ("lightness", num(amount)), ("saturation", num(amount)), ("grainSize", num(grain))];
+                run(id, &vals, img.clone(), 0.0).img
+            };
+            let (low, high) = (at(100.0, 1.0), at(1000.0, 1.0));
+            assert_ne!(low, high, "{id}");
+            for out in [high, at(1000.0, 0.0)] {
+                assert!(out.data.iter().flatten().all(|v| v.is_finite() && (0.0..=1.0).contains(v)), "{id}");
+            }
+        }
+    }
+
     #[test]
     fn add_grain_keeps_flat_mean() {
         let out = run("ec.noise.addgrain", &[("tweaking/intensity", num(2.0)), ("application/blendingMode", Value::Enum(2))], gray(64, 64, 0.5), 0.0);
diff --git a/crates/effects/src/stylize2.rs b/crates/effects/src/stylize2.rs
index 247854352..a2de2c35e 100644
--- a/crates/effects/src/stylize2.rs
+++ b/crates/effects/src/stylize2.rs
@@ -612,7 +612,7 @@ pub fn specs() -> Vec<EffectSpec> {
             "ec.stylize.scatter",
             "Scatter",
             vec![
-                p("amount", "Scatter Amount", num(0.0), slider(0.0, 127.0, 0.0, 127.0, 1)),
+                p("amount", "Scatter Amount", num(0.0), slider(0.0, 1000.0, 0.0, 127.0, 1)),
                 p("grain", "Grain", Value::Enum(0), popup(&["Both", "Horizontal", "Vertical"])),
                 p("randomizeEveryFrame", "Scatter Randomness", Value::Bool(false), ParamUi::Checkbox),
             ],
diff --git a/crates/engine/src/interchange/keyframe_text_effects.rs b/crates/engine/src/interchange/keyframe_text_effects.rs
index 83f5b6c20..7b0658f61 100644
--- a/crates/engine/src/interchange/keyframe_text_effects.rs
+++ b/crates/engine/src/interchange/keyframe_text_effects.rs
@@ -273,6 +273,7 @@ pub(crate) const UNITS: &[(&str, &str, &str)] = &[
     ("ec.distort.wavewarp", "width", "percent"),
     ("ec.distort.wavewarp", "speed", "pixels"),
     ("ec.generate.fourcolor", "blend", "percent"),
+    ("ec.generate.fourcolor", "jitter", "percent"),
     ("ec.generate.advancedlightning", "coreSettings/coreRadius", ""),
     ("ec.generate.advancedlightning", "glowSettings/glowRadius", "percent"),
     ("ec.generate.advancedlightning", "alphaObstacle", "pixels"),
@@ -317,6 +318,15 @@ pub(crate) const UNITS: &[(&str, &str, &str)] = &[
     ("ec.matte.rotobrush", "refineEdgeMatte/shiftEdge", "percent"),
     ("ec.matte.rotobrush", "refineEdgeMatte/decontamination/increaseDecontaminationRadius", ""),
     ("ec.matte.simplechoker", "chokeMatte", "pixels"),
+    // Their ranges were 0..100 (#3483, #3484).
+    ("ec.noise.noisehls", "hue", "percent"),
+    ("ec.noise.noisehls", "lightness", "percent"),
+    ("ec.noise.noisehls", "saturation", "percent"),
+    ("ec.noise.noisehls", "grainSize", ""),
+    ("ec.noise.noisehlsauto", "hue", "percent"),
+    ("ec.noise.noisehlsauto", "lightness", "percent"),
+    ("ec.noise.noisehlsauto", "saturation", "percent"),
+    ("ec.noise.noisehlsauto", "grainSize", ""),
     ("ec.noise.fractal", "transform/scale", "percent"),
     ("ec.noise.fractal", "transform/scaleWidth", "percent"),
     ("ec.noise.fractal", "transform/scaleHeight", "percent"),
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index b2964916f..df0853398 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -14,6 +14,7 @@ mod crypto_pick;
 mod delete_keys;
 mod disk_cache;
 mod display_pass;
+mod effect_ranges;
 mod effects;
 mod essential;
 mod essential_more;
diff --git a/crates/engine/src/tests/effect_ranges.rs b/crates/engine/src/tests/effect_ranges.rs
new file mode 100644
index 000000000..7deaaa911
--- /dev/null
+++ b/crates/engine/src/tests/effect_ranges.rs
@@ -0,0 +1,170 @@
+//! Effect parameters take the whole valid range After Effects records for them (fx_defs in the
+//! aep crate), end to end: `prop.set` keeps both ends, undo and redo restore them, and a saved
+//! project reopens with them. The aep crate's
+//! `effect_hard_ranges_cover_recorded_after_effects_ranges` checks the ranges themselves
+//! against that table.
+
+use effectcraft_project::{LayerId, Node, ParamUi, PropGroup};
+use serde_json::{Value, json};
+
+use crate::Session;
+
+/// (issue, effect, parameter path, lowest, highest): the ends of the range the effect now accepts,
+/// in EffectCraft's units: After Effects' valid range, or wider where EffectCraft already was.
+/// At least one end of each is outside the range accepted before the issue.
+#[rustfmt::skip]
+const ROWS: &[(u32, &str, &str, f64, f64)] = &[
+    (3487, "ec.color.levelsic", "rgb/rgbInBlack", -10000.0, 10000.0),
+    (3488, "ec.color.levelsic", "rgb/rgbInWhite", -10000.0, 10000.0),
+    (3489, "ec.color.levelsic", "rgb/rgbOutBlack", -10000.0, 10000.0),
+    (3490, "ec.color.levelsic", "rgb/rgbOutWhite", -10000.0, 10000.0),
+    (3491, "ec.color.levelsic", "rgb/rgbGamma", 0.0, 10.0),
+    (3487, "ec.color.levelsic", "red/redInBlack", -10000.0, 10000.0),
+    (3488, "ec.color.levelsic", "red/redInWhite", -10000.0, 10000.0),
+    (3489, "ec.color.levelsic", "red/redOutBlack", -10000.0, 10000.0),
+    (3490, "ec.color.levelsic", "red/redOutWhite", -10000.0, 10000.0),
+    (3491, "ec.color.levelsic", "red/redGamma", 0.0, 10.0),
+    (3487, "ec.color.levelsic", "green/greenInBlack", -10000.0, 10000.0),
+    (3488, "ec.color.levelsic", "green/greenInWhite", -10000.0, 10000.0),
+    (3489, "ec.color.levelsic", "green/greenOutBlack", -10000.0, 10000.0),
+    (3490, "ec.color.levelsic", "green/greenOutWhite", -10000.0, 10000.0),
+    (3491, "ec.color.levelsic", "green/greenGamma", 0.0, 10.0),
+    (3487, "ec.color.levelsic", "blue/blueInBlack", -10000.0, 10000.0),
+    (3488, "ec.color.levelsic", "blue/blueInWhite", -10000.0, 10000.0),
+    (3489, "ec.color.levelsic", "blue/blueOutBlack", -10000.0, 10000.0),
+    (3490, "ec.color.levelsic", "blue/blueOutWhite", -10000.0, 10000.0),
+    (3491, "ec.color.levelsic", "blue/blueGamma", 0.0, 10.0),
+    (3487, "ec.color.levelsic", "alpha/alphaInBlack", -10000.0, 10000.0),
+    (3488, "ec.color.levelsic", "alpha/alphaInWhite", -10000.0, 10000.0),
+    (3489, "ec.color.levelsic", "alpha/alphaOutBlack", -10000.0, 10000.0),
+    (3490, "ec.color.levelsic", "alpha/alphaOutWhite", -10000.0, 10000.0),
+    (3491, "ec.color.levelsic", "alpha/alphaGamma", 0.0, 10.0),
+    (3478, "ec.generate.fourcolor", "blend", 1.0, 10000.0),
+    (3479, "ec.generate.fourcolor", "jitter", 0.0, 500.0),
+    (3483, "ec.noise.noisehls", "hue", 0.0, 1000.0),
+    (3483, "ec.noise.noisehls", "lightness", 0.0, 1000.0),
+    (3483, "ec.noise.noisehls", "saturation", 0.0, 1000.0),
+    (3484, "ec.noise.noisehls", "grainSize", 0.0, 100.0),
+    (3483, "ec.noise.noisehlsauto", "hue", 0.0, 1000.0),
+    (3483, "ec.noise.noisehlsauto", "lightness", 0.0, 1000.0),
+    (3483, "ec.noise.noisehlsauto", "saturation", 0.0, 1000.0),
+    (3484, "ec.noise.noisehlsauto", "grainSize", 0.0, 100.0),
+    (3480, "ec.color.changecolor", "hueTransform", -1800.0, 1800.0),
+    (3476, "ec.generate.grid", "border", 0.0, 2000.0),
+    (3472, "ec.transition.venetian", "width", 1.0, 32000.0),
+    (3473, "ec.transition.venetian", "feather", 0.0, 32000.0),
+    (3474, "ec.transition.radialwipe", "feather", 0.0, 32000.0),
+    (3477, "ec.stylize.scatter", "amount", 0.0, 1000.0),
+    (3475, "ec.generate.beam", "startThickness", 0.0, 4000.0),
+    (3475, "ec.generate.beam", "endThickness", 0.0, 4000.0),
+    (3471, "ec.distort.transform", "scaleHeight", -30000.0, 30000.0),
+    (3471, "ec.distort.transform", "scaleWidth", -30000.0, 30000.0),
+    (3470, "ec.distort.turbulentdisplace", "evolutionOptions/randomSeed", 0.0, 100000.0),
+];
+
+fn path(effect: &str, param: &str) -> String {
+    format!("effects/{effect}/{param}")
+}
+
+fn read(s: &mut Session, layer: u64, effect: &str, param: &str) -> f64 {
+    let got = s.execute("prop.get", json!({"layer": layer, "path": path(effect, param)})).unwrap();
+    got["value"].as_f64().unwrap_or_else(|| panic!("{effect} {param}: {got}"))
+}
+
+fn set(s: &mut Session, layer: u64, effect: &str, param: &str, v: f64) -> Value {
+    s.execute("prop.set", json!({"layer": layer, "path": path(effect, param), "value": v})).unwrap()
+}
+
+/// A composition with two solids, each with one instance of every effect in [`ROWS`].
+fn session() -> (Session, u64, u64) {
+    let mut s = Session::default();
+    s.execute("comp.new", json!({"name": "Main", "width": 320, "height": 180, "frameRate": 30, "duration": 2})).unwrap();
+    let mut layers = [0; 2];
+    for l in &mut layers {
+        *l = s.execute("layer.newSolid", json!({"color": "#808080", "width": 64, "height": 36})).unwrap()["layer"].as_u64().unwrap();
+        let mut effects: Vec<&str> = ROWS.iter().map(|r| r.1).collect();
+        effects.dedup();
+        for e in effects {
+            s.execute("effect.apply", json!({"layers": [*l], "effect": e})).unwrap();
+        }
+    }
+    (s, layers[0], layers[1])
+}
+
+/// Both ends of every row survive `prop.set`, undo / redo, and a save and reopen.
+#[test]
+fn effect_parameters_keep_both_ends_of_the_after_effects_range() {
+    let (mut s, low, high) = session();
+    for &(issue, e, p, lo, hi) in ROWS {
+        assert_eq!(set(&mut s, high, e, p, lo), json!(lo), "#{issue} {e} {p}: prop.set reply");
+        assert_eq!(read(&mut s, high, e, p), lo, "#{issue} {e} {p}");
+        set(&mut s, high, e, p, hi);
+        assert_eq!(read(&mut s, high, e, p), hi, "#{issue} {e} {p}");
+        assert!(s.undo());
+        assert_eq!(read(&mut s, high, e, p), lo, "#{issue} {e} {p}: undo");
+        assert!(s.redo());
+        assert_eq!(read(&mut s, high, e, p), hi, "#{issue} {e} {p}: redo");
+        set(&mut s, low, e, p, lo);
+    }
+    let dir = std::env::temp_dir().join(format!("ec-effect-ranges-{}", std::process::id()));
+    std::fs::create_dir_all(&dir).unwrap();
+    let file = dir.join("ranges.ecproj").to_string_lossy().to_string();
+    s.execute("file.save", json!({"path": file})).unwrap();
+    let mut s2 = Session::default();
+    s2.execute("file.open", json!({"path": file})).unwrap();
+    let _ = std::fs::remove_dir_all(dir);
+    for &(issue, e, p, lo, hi) in ROWS {
+        assert_eq!(read(&mut s2, low, e, p), lo, "#{issue} {e} {p}: reopened");
+        assert_eq!(read(&mut s2, high, e, p), hi, "#{issue} {e} {p}: reopened");
+    }
+}
+
+/// A project saved while these ranges were narrower stored that range with each instance
+/// (`ParamUi`) and values clamped to it: opening it takes the effect's current range and keeps
+/// the stored values, so the new ends can be set.
+#[test]
+fn projects_saved_with_the_narrower_ranges_open_with_the_new_ones() {
+    let (mut s, low, _) = session();
+    let cid = s.active_comp_id().unwrap();
+    let mut old = (*s.project).clone();
+    let stored: Vec<f64> = ROWS.iter().map(|&(_, e, p, ..)| read(&mut s, low, e, p)).collect();
+    {
+        let effectcraft_project::ItemKind::Comp(comp) = &mut old.items.get_mut(&cid).unwrap().kind else { panic!("not a composition") };
+        let l = std::sync::Arc::make_mut(comp).layers.find_mut(|l| l.id == LayerId(low)).unwrap();
+        for (&(_, e, p, ..), v) in ROWS.iter().zip(&stored) {
+            let g = l.props.sub_mut("effects").unwrap().children.iter_mut().find_map(|n| match n {
+                Node::Group(g) if g.match_id == e => Some(g),
+                _ => None,
+            });
+            let pr = prop_mut(g.unwrap(), p).unwrap_or_else(|| panic!("{e} {p}"));
+            // The narrowest stored range that still holds the stored value.
+            pr.ui = ParamUi::Slider { min: *v, max: *v, slider_min: *v, slider_max: *v, decimals: 1 };
+        }
+    }
+    let dir = std::env::temp_dir().join(format!("ec-effect-ranges-old-{}", std::process::id()));
+    std::fs::create_dir_all(&dir).unwrap();
+    let file = dir.join("old.ecproj").to_string_lossy().to_string();
+    std::fs::write(&file, old.to_json()).unwrap();
+    let mut s2 = Session::default();
+    s2.execute("file.open", json!({"path": file})).unwrap();
+    let _ = std::fs::remove_dir_all(dir);
+    for (&(issue, e, p, lo, hi), v) in ROWS.iter().zip(&stored) {
+        assert_eq!(read(&mut s2, low, e, p), *v, "#{issue} {e} {p}: the stored value is kept");
+        let spec = effectcraft_effects::find(e).unwrap().params.iter().find(|q| q.id == p).unwrap();
+        let uid = s2.execute("prop.get", json!({"layer": low, "path": path(e, p)})).unwrap()["uid"].as_u64().unwrap();
+        let layer = s2.project.comp(cid).unwrap().layer(LayerId(low)).unwrap();
+        assert_eq!(layer.props.find(uid).unwrap().ui, spec.ui, "#{issue} {e} {p}: the range is refreshed");
+        set(&mut s2, low, e, p, lo);
+        assert_eq!(read(&mut s2, low, e, p), lo, "#{issue} {e} {p}");
+        set(&mut s2, low, e, p, hi);
+        assert_eq!(read(&mut s2, low, e, p), hi, "#{issue} {e} {p}");
+    }
+}
+
+/// The property at `path` (`group/param`) in an effect instance.
+fn prop_mut<'a>(g: &'a mut PropGroup, path: &str) -> Option<&'a mut effectcraft_project::Property> {
+    match path.split_once('/') {
+        None => g.get_mut(path),
+        Some((first, rest)) => prop_mut(g.sub_mut(first)?, rest),
+    }
+}
diff --git a/crates/engine/src/tests/keyframe_text.rs b/crates/engine/src/tests/keyframe_text.rs
index 30d3b436e..a299899eb 100644
--- a/crates/engine/src/tests/keyframe_text.rs
+++ b/crates/engine/src/tests/keyframe_text.rs
@@ -480,3 +480,29 @@ fn camera_light_and_material_options_are_written_as_after_effects_does() {
         assert!(text.contains(block), "{block}in\n{text}");
     }
 }
+
+/// The unit column of `name`'s block in copied keyframe text.
+fn unit_of<'a>(text: &'a str, name: &str) -> &'a str {
+    let mut lines = text.lines().skip_while(|l| !l.contains(&format!("\t{name} #")));
+    lines.next().unwrap_or_else(|| panic!("no {name} in\n{text}"));
+    lines.next().and_then(|l| l.strip_prefix("\tFrame\t")).and_then(|l| l.strip_suffix('\t')).unwrap_or_else(|| panic!("{name} in\n{text}"))
+}
+
+/// Widening a 0..100 slider to After Effects' range (#3479, #3483, #3484) keeps the unit the
+/// keyframe text writes for it.
+#[test]
+fn widened_effect_ranges_keep_their_keyframe_text_units() {
+    let (mut s, l) = session();
+    s.execute("effect.apply", json!({"layer": l.0, "effect": "ec.generate.fourcolor"})).unwrap();
+    let text = copy_props(&mut s, l, &["effects/#1/blend", "effects/#1/jitter"]);
+    assert_eq!(unit_of(&text, "Blend"), "percent");
+    assert_eq!(unit_of(&text, "Jitter"), "percent");
+    for fx in ["ec.noise.noisehls", "ec.noise.noisehlsauto"] {
+        let (mut s, l) = session();
+        s.execute("effect.apply", json!({"layer": l.0, "effect": fx})).unwrap();
+        let text = copy_props(&mut s, l, &["effects/#1/hue", "effects/#1/lightness", "effects/#1/saturation", "effects/#1/grainSize"]);
+        for (name, unit) in [("Hue", "percent"), ("Lightness", "percent"), ("Saturation", "percent"), ("Grain Size", "")] {
+            assert_eq!(unit_of(&text, name), unit, "{fx} {name}");
+        }
+    }
+}
diff --git a/crates/gpu/src/fx_generate.rs b/crates/gpu/src/fx_generate.rs
index 893208a15..2dda38f45 100644
--- a/crates/gpu/src/fx_generate.rs
+++ b/crates/gpu/src/fx_generate.rs
@@ -385,7 +385,7 @@ fn four_color(e: &mut Enc, ctx: &EffectCtx, b: GBuf) -> Option<GBuf> {
         p.f[4 + i] = ctx.params.color(&format!("positionsColors/color{}", i + 1));
     }
     let k = effectcraft_effects::four_color_softening(ctx.params.f("blend"), b.scale);
-    let jitter = (ctx.params.f("jitter") / 100.0).clamp(0.0, 1.0) as f32;
+    let jitter = effectcraft_effects::four_color_jitter(ctx.params.f("jitter"));
     p.u[0] = [gen_mode(ctx.params.e("blendingMode")), ctx.seed, 0, 0];
     p.f[8] = [k as f32, jitter, ctx.params.f("opacity") as f32 / 100.0, 0.0];
     run(e, "gen_fourcolor", &p, b, None, None)
diff --git a/crates/gpu/src/shaders/fx_tone.wgsl b/crates/gpu/src/shaders/fx_tone.wgsl
index bb206adbd..9472d63f0 100644
--- a/crates/gpu/src/shaders/fx_tone.wgsl
+++ b/crates/gpu/src/shaders/fx_tone.wgsl
@@ -40,7 +40,16 @@ fn fxt_lv(i: u32, v: f32, clip_b: bool, clip_w: bool) -> f32 {
     if (clip_w) {
         t = min(t, 1.0);
     }
-    return data[o + 3u] + (data[o + 4u] - data[o + 3u]) * fxt_gamma(t, max(data[o + 2u], 0.01));
+    // color2::LEVELS_IC_CURVE_LIMIT keeps the curve finite. WGSL leaves an overflowing pow
+    // indeterminate, so a curve past the bound saturates before pow: |t|^(1/g) > 1e30 once
+    // log2|t| / g > 99.66; between 1e30 and 2^99.7 the clamp gives the same 1e30.
+    // A branch, not select: select evaluates both sides, so pow would still run.
+    let g = max(data[o + 2u], 0.01);
+    var curve = sign(t) * 1e30;
+    if (!(abs(t) > 1.0 && log2(abs(t)) / g > 99.7)) {
+        curve = clamp(fxt_gamma(t, g), -1e30, 1e30);
+    }
+    return data[o + 3u] + (data[o + 4u] - data[o + 3u]) * curve;
 }
 
 // color_fx::level (data offset o: ib, iw, g, ob, ow, clip black, clip white).
diff --git a/crates/gpu/src/tests/fx_distort.rs b/crates/gpu/src/tests/fx_distort.rs
index 1b8621408..6fc18f3c9 100644
--- a/crates/gpu/src/tests/fx_distort.rs
+++ b/crates/gpu/src/tests/fx_distort.rs
@@ -38,6 +38,8 @@ fn twirl_bulge_ripple_wave_warp() {
 #[test]
 fn turbulent_displace_and_cc_lens() {
     effect_case("ec.distort.turbulentdisplace", &[("size", n(30.0)), ("amount", n(20.0))]);
+    // #3470: After Effects' maximum Random Seed.
+    effect_case("ec.distort.turbulentdisplace", &[("size", n(30.0)), ("amount", n(20.0)), ("evolutionOptions/randomSeed", n(100000.0))]);
     effect_case(
         "ec.distort.turbulentdisplace",
         &[("displacement", e(1)), ("complexity", n(3.5)), ("evolution", n(90.0)), ("size", n(25.0)), ("pinning", e(2)), ("resizeLayer", on())],
diff --git a/crates/gpu/src/tests/fx_gen2.rs b/crates/gpu/src/tests/fx_gen2.rs
index 620cced13..1c19725e1 100644
--- a/crates/gpu/src/tests/fx_gen2.rs
+++ b/crates/gpu/src/tests/fx_gen2.rs
@@ -40,6 +40,8 @@ fn closed_form() {
     env_case("ec.generate.beam", &[]);
     env_case("ec.generate.beam", &[("length", n(70.0)), ("time", n(40.0)), ("softness", n(0.0)), ("perspective3d", off()), ("compositeOnOriginal", off())]);
     env_case("ec.generate.beam", &[("startThickness", n(3.0)), ("endThickness", n(20.0)), ("insideColor", c(0.3, 0.9, 1.0))]);
+    // #3475: After Effects' maximum thickness.
+    env_case("ec.generate.beam", &[("startThickness", n(0.0)), ("endThickness", n(4000.0))]);
     env_case("ec.generate.lensflare", &[]);
     env_case("ec.generate.lensflare", &[("lensType", e(1)), ("flareCenter", pt(50.0, 30.0)), ("blendWithOriginal", n(30.0))]);
     env_case("ec.generate.lensflare", &[("lensType", e(2)), ("flareBrightness", n(160.0))]);
diff --git a/crates/gpu/src/tests/fx_generate.rs b/crates/gpu/src/tests/fx_generate.rs
index d12920797..f8482b5ab 100644
--- a/crates/gpu/src/tests/fx_generate.rs
+++ b/crates/gpu/src/tests/fx_generate.rs
@@ -83,6 +83,11 @@ fn wipes() {
     effect_case("ec.transition.radialwipe", &[("completion", n(45.0)), ("wipe", e(1)), ("center", pt(30.2, 19.6))]);
     effect_case("ec.transition.radialwipe", &[("completion", n(60.0)), ("wipe", e(2)), ("startAngle", n(-40.0)), ("feather", n(3.0))]);
     effect_case("ec.transition.radialwipe", &[("completion", n(0.0)), ("feather", n(20.0))]);
+    // #3472-#3474: the ends of After Effects' ranges (a Feather wider than 8 blinds is the CPU's
+    // even veil).
+    effect_case("ec.transition.venetian", &[("completion", n(40.0)), ("width", n(1.0)), ("feather", n(6.0))]);
+    effect_case("ec.transition.venetian", &[("completion", n(40.0)), ("width", n(32000.0)), ("feather", n(32000.0))]);
+    effect_case("ec.transition.radialwipe", &[("completion", n(40.0)), ("feather", n(32000.0))]);
     effect_case("ec.transition.gradientwipe", &[("completion", n(40.0))]);
     effect_case("ec.transition.gradientwipe", &[("completion", n(55.0)), ("softness", n(30.0)), ("invert", b(true))]);
     effect_case("ec.transition.gradientwipe", &[("completion", n(100.0))]);
@@ -147,6 +152,8 @@ fn generators() {
     );
     effect_case("ec.generate.checkerboard", &[("sizeFrom", e(0)), ("corner", pt(16.0, 11.0)), ("color", c(0.9, 0.3, 0.1)), ("blendingMode", e(1))]);
     effect_case("ec.generate.grid", &[("width", n(12.0)), ("border", n(3.0))]);
+    // #3476: a border wider than the cells (After Effects' maximum).
+    effect_case("ec.generate.grid", &[("width", n(12.0)), ("border", n(2000.0))]);
     effect_case(
         "ec.generate.grid",
         &[
@@ -167,6 +174,8 @@ fn generators() {
     effect_case("ec.generate.fourcolor", &[]);
     effect_case("ec.generate.fourcolor", &[("blend", n(40.0)), ("jitter", n(50.0)), ("opacity", n(80.0)), ("blendingMode", e(3))]);
     effect_case("ec.generate.fourcolor", &[("blend", n(600.0)), ("blendingMode", e(16)), ("positionsColors/point2", pt(30.0, 20.0))]);
+    // #3478, #3479: the top of After Effects' ranges.
+    effect_case("ec.generate.fourcolor", &[("blend", n(10000.0)), ("jitter", n(500.0))]);
 }
 
 #[test]
diff --git a/crates/gpu/src/tests/fx_noise.rs b/crates/gpu/src/tests/fx_noise.rs
index 7d13004ee..006128c73 100644
--- a/crates/gpu/src/tests/fx_noise.rs
+++ b/crates/gpu/src/tests/fx_noise.rs
@@ -164,6 +164,8 @@ fn noise_alpha_and_hls() {
     effect_case("ec.noise.noisehls", &[("hue", n(30.0)), ("lightness", n(20.0)), ("saturation", n(40.0))]);
     effect_case("ec.noise.noisehls", &[("noise", e(1)), ("lightness", n(50.0)), ("noisePhase", n(200.0))]);
     effect_case("ec.noise.noisehls", &[("noise", e(2)), ("hue", n(60.0)), ("saturation", n(25.0)), ("grainSize", n(3.0))]);
+    // #3483, #3484: the ends of After Effects' ranges.
+    effect_case("ec.noise.noisehls", &[("noise", e(2)), ("hue", n(1000.0)), ("lightness", n(1000.0)), ("saturation", n(1000.0)), ("grainSize", n(0.0))]);
     effect_case("ec.noise.noisehlsauto", &[("noise", e(0)), ("hue", n(20.0)), ("lightness", n(30.0)), ("noiseAnimationSpeed", n(7.0))]);
 }
 
diff --git a/crates/gpu/src/tests/fx_stylize.rs b/crates/gpu/src/tests/fx_stylize.rs
index 63d93f207..8c6c7be33 100644
--- a/crates/gpu/src/tests/fx_stylize.rs
+++ b/crates/gpu/src/tests/fx_stylize.rs
@@ -109,6 +109,8 @@ fn arbitrary_map_signed_fractional_and_near_zero_wraps() {
 #[test]
 fn scatter_brush_strokes() {
     effect_case("ec.stylize.scatter", &[("amount", n(5.0))]);
+    // #3477: After Effects' maximum, far beyond the layer.
+    effect_case("ec.stylize.scatter", &[("amount", n(1000.0))]);
     effect_case("ec.stylize.scatter", &[("amount", n(3.0)), ("grain", e(1))]);
     effect_case("ec.stylize.scatter", &[("amount", n(7.0)), ("grain", e(2)), ("randomizeEveryFrame", on())]);
     effect_case("ec.stylize.brushstrokes", &[]);
diff --git a/crates/gpu/src/tests/fx_tone.rs b/crates/gpu/src/tests/fx_tone.rs
index 40bc9483f..3083f5949 100644
--- a/crates/gpu/src/tests/fx_tone.rs
+++ b/crates/gpu/src/tests/fx_tone.rs
@@ -29,6 +29,17 @@ fn levels_and_gamma() {
     );
     effect_case("ec.color.levelsic", &[("green/greenInBlack", n(0.2)), ("green/greenInWhite", n(0.6)), ("clipToOutputWhite", e(0))]);
     effect_case("ec.color.levelsic", &[("alpha/alphaOutBlack", n(0.3))]);
+    // #3487-#3491: the ends of the valid ranges, the curve bounded where gamma 0 would overflow.
+    effect_case(
+        "ec.color.levelsic",
+        &[
+            ("rgb/rgbInWhite", n(0.2)),
+            ("rgb/rgbGamma", n(0.0)),
+            ("red/redOutBlack", n(-10000.0)),
+            ("blue/blueOutWhite", n(10000.0)),
+            ("clipToOutputWhite", e(0)),
+        ],
+    );
     effect_case("ec.color.levels", &[("redInBlack", n(0.1)), ("greenGamma", n(1.5)), ("blueOutWhite", n(0.7)), ("inWhite", n(0.9))]);
     effect_case("ec.color.levels", &[("alphaInWhite", n(0.6)), ("redInWhite", n(0.5)), ("redClipToOutputWhite", e(0))]);
     effect_case("ec.color.gammapedestalgain", &[("redGamma", n(1.4)), ("greenPedestal", n(0.1)), ("blueGain", n(0.8))]);
@@ -70,6 +81,8 @@ fn colour_replacement() {
         &[("amount", n(100.0)), ("color", c(0.8, 0.4, 0.3)), ("matchColors", e(1)), ("tolerance", n(5.0)), ("edgeSoftness", n(30.0))],
     );
     effect_case("ec.color.changecolor", &[("hueTransform", n(90.0)), ("colorToChange", c(0.7, 0.5, 0.4)), ("matchingSoftness", n(20.0))]);
+    // #3480: near the top of After Effects' range (four and three quarter turns).
+    effect_case("ec.color.changecolor", &[("hueTransform", n(1710.0)), ("colorToChange", c(0.7, 0.5, 0.4)), ("matchingSoftness", n(20.0))]);
     effect_case(
         "ec.color.changecolor",
         &[
@@ -188,3 +201,33 @@ fn color_stabilizer() {
 fn gradient_ramp_matches_the_cpu() {
     effect_case("ec.generate.gradientramp", &[]);
 }
+
+/// #3487-#3491: at the ends of the valid ranges the GPU's Levels (Individual Controls) output is
+/// finite (the CPU / GPU comparison counts infinity on both sides as equal).
+#[test]
+fn levels_ic_is_finite_at_the_ends_of_its_ranges() {
+    let Some(g) = crate::tests::gpu() else { return };
+    let spec = effectcraft_effects::find("ec.color.levelsic").unwrap();
+    let size = [16.0, 8.0];
+    let mut params =
+        effectcraft_effects::Params { values: spec.params.iter().map(|ps| (ps.id.to_string(), effectcraft_effects::default_value(ps, size))).collect() };
+    for (k, v) in [
+        ("rgb/rgbInWhite", n(0.2)),
+        ("rgb/rgbGamma", n(0.0)),
+        ("red/redOutBlack", n(-10000.0)),
+        ("blue/blueOutWhite", n(10000.0)),
+        ("green/greenOutWhite", n(0.0)),
+        ("clipToOutputWhite", e(0)),
+    ] {
+        params.values.insert(k.to_string(), v);
+    }
+    let mut img = crate::tests::pattern(7, 16, 8);
+    for p in &mut img.data {
+        *p = p.map(|v| v * 3.0);
+    }
+    let buf = effectcraft_effects::Buf { img, offset: [0.0, 0.0], scale: 1.0 };
+    let ctx = effectcraft_effects::EffectCtx { params: &params, time: 0.0, layer_size: size, seed: 1, adjustment: false, env: Default::default() };
+    let out = effectcraft_render::Accelerator::effects(g, &[effectcraft_render::FxStep { spec, ctx }], &buf, None)
+        .expect("the GPU runs Levels (Individual Controls)");
+    assert!(out.img.data.iter().flatten().all(|v| v.is_finite()), "{:?}", out.img.data.iter().find(|p| p.iter().any(|v| !v.is_finite())));
+}
diff --git a/docs/effects-parity.md b/docs/effects-parity.md
index c7f850834..93bdf4792 100644
--- a/docs/effects-parity.md
+++ b/docs/effects-parity.md
@@ -64,6 +64,7 @@ the GPU is performance, not parity.
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-11-12 | minor | Parameters take After Effects' recorded valid ranges (hard range; defaults and sliders unchanged): Levels (Individual Controls) levels −10000..10000 and Gamma from 0; 4-Color Gradient Blend to 10000 and Jitter to 500 %; Change Color Hue Transform ±1800°; Noise HLS (and Auto) amounts to 1000 % and Grain Size from 0; Grid Border to 2000; Venetian Blinds Width 1..32000 and Feather to 32000; Radial Wipe Feather to 32000; Scatter Amount to 1000; Beam thicknesses to 4000; Transform Scale ±30000 %; Turbulent Displace Random Seed to 100000. A test checks every mapped parameter's range against the recorded table (CPU and GPU) |
 | 2026-10-19 | minor | Glow (original colours): bright pass per channel, 8 × (value − threshold + 0.061), measured against After Effects 2026 (CPU and GPU) |
 | 2026-10-19 | minor | Glow (colour channels): the glow covers the layer's blurred alpha, blur σ = 0.384 × radius, measured against After Effects 2026 renders (CPU and GPU) |
 | 2026-10-19 | minor | Radial Blur repeats the edge instead of sampling transparency outside the layer, measured against After Effects 2026 renders (CPU; Radial Blur has no GPU path) |