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Grzegorz MartensandClaude Opus 5.5
907a9fa917
The PDF Optimizer and Reduce File Size downsampled colour and grey images
but not black-and-white ones. Settings::mono is now MonoSettings {
downsample, target_ppi, above_ppi, compression }, 300 ppi above 450 ppi
and CCITT Group 4 by default (Monochrome Images ▸ Downsample to;
doc_optimize mono: { downsample, ppi, above_ppi, compression }).
A 1-bit image or image mask (no filter, general-purpose filters, or CCITT
fax after any of them) and eight-bit grey of only black and white are averaged by
area: each new pixel takes the sample covering more of it, a tie 0, so a
dark line half a new pixel wide stays. They are stored as Group 4, or as
1-bit Flate when that is smaller; with Retain a resampled image keeps its
kind of compression. Images with a soft mask keep their size.
CCITT decoding moves from Export ▸ Images into pdfcraft-filters
(decode_ccitt, CcittParams, through hayro-ccitt), and
pdfcraft_cos::Document::decoded_image reads a fax image's /DecodeParms
for it (undoing filters before CCITT, such as ASCII85Decode, with any
/DecodeParms given by reference made direct first), so export
and the optimizer share one reader, and Group 4 scans can be
downsampled. A 600 ppi text page went from 79 KB to 40 KB.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BfMGHQNgdq5yf5tKZHGR3z
28 lines
889 B
TOML
28 lines
889 B
TOML
[package]
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name = "pdfcraft-optimize"
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description = "The PDF Optimizer: image downsampling and recompression, discarding objects, clean-up"
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version.workspace = true
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edition.workspace = true
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license.workspace = true
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rust-version.workspace = true
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repository.workspace = true
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[lints]
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workspace = true
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[dependencies]
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pdfcraft-cos = { workspace = true }
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pdfcraft-filters = { workspace = true }
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pdfcraft-content = { workspace = true }
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pdfcraft-model = { workspace = true }
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pdfcraft-annot = { workspace = true }
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thiserror.workspace = true
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# JPEG decoding (zune-jpeg) and encoding, and bicubic resampling; already in the tree.
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image = { version = "0.25", default-features = false, features = ["jpeg"] }
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# The same JPEG decoder, used directly to read samples untransformed (/ColorTransform 0).
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zune-jpeg = "0.5"
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[dev-dependencies]
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pdfcraft-render = { workspace = true }
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proptest.workspace = true
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