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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
32 lines
1.1 KiB
TOML
32 lines
1.1 KiB
TOML
[package]
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name = "pdfcraft-create"
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description = "Create PDFs: blank documents, from images (PNG, JPEG) and from plain text"
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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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[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-model = { workspace = true }
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pdfcraft-fonts = { workspace = true }
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# For `image::bmp_with_pixel_offset`, shared with XFA pictures.
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pdfcraft-xfa = { workspace = true }
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png = "0.18"
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tiff = "0.11"
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image = { version = "0.25", default-features = false, features = ["bmp", "gif", "jpeg"] }
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# Already in the graph through image; read directly for CMYK JPEG samples, which image converts to RGB.
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zune-jpeg = "0.5"
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thiserror = { workspace = true }
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# Already in the graph through lopdf; used only to read plain-text files (decode_text).
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encoding_rs = "0.8"
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[dev-dependencies]
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# An independent CCITT decoder, to check Create PDF's Group 4 images.
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hayro-ccitt.workspace = true
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image = { version = "0.25", default-features = false, features = ["bmp", "gif", "jpeg"] }
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hayro-syntax = { workspace = true }
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