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M11: say redaction and export don't read Group 4 yet; Reduce File Size's descriptions

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- Redaction doesn't decode CCITT, so a mark over part of an image the
  optimizer stored as Group 4 removes the whole image (nothing leaks),
  and Export ▸ Images refuses it. The optimize README and the
  mono-compression parity note say so. Later PRs of this stack add both
  (#4335 export, #4384 redaction).
- doc_reduce's description, Engine::reduced_bytes and docs/cli-batch.md
  now list the black-and-white step; docs/target-app-parity.md's
  optimize row gives the measured counts and no longer lists CCITT as
  missing; the M11 milestone row lists it as done.

From reviews with the pdfcraft-review skill.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01P6yUtvWGPsJpMLyh6pxSXG
This commit is contained in:
Grzegorz Martens
2026-10-29 20:47:39 +01:00
co-authored by Claude Opus 5.5
parent 3143c4a044
commit 4543bae3bf
7 changed files with 13 additions and 10 deletions
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parity/acrobat-features.toml
+1 -1
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@@ -7385,7 +7385,7 @@ status = "partial"
commands = ["optimize.advanced", "optimize.reduce"]
tools = ["doc_optimize", "doc_reduce"]
evidence = ["crates/filters/src/ccitt.rs::bitmaps_round_trip", "crates/filters/src/ccitt.rs::a_page_of_text_like_marks_round_trips_and_shrinks", "crates/filters/src/ccitt.rs::what_it_cannot_encode_is_an_error", "crates/optimize/tests/optimize.rs::black_and_white_images_become_ccitt_group_4", "crates/automation/tests/it/automation.rs::doc_optimize_stores_black_and_white_images_as_ccitt_group_4", "crates/ui-egui/tests/it/create.rs::the_pdf_optimizer_dialog_saves_an_optimized_copy"]
notes = "CCITT Group 4, lossless: PDF Optimizer ▸ Images ▸ Monochrome Images (on by default, so Reduce File Size does it too; doc_optimize mono) stores a 1-bit image of one colour component (grey, indexed, a separation) or an image mask, kept with no filter or general-purpose ones, as Group 4 when that is smaller as stored; the samples decode to the same bits, so colour space, decode array and masks stay. Group 4 wins on scans; on clean computer-drawn 1-bit art Flate can be smaller, and the image then stays. Not yet: JBIG2 (lossless or lossy, which Adobe's help says beats CCITT for monochrome), monochrome downsampling, inline images, soft masks and /Mask images, rows wider than 32,767 samples."
notes = "CCITT Group 4, lossless: PDF Optimizer ▸ Images ▸ Monochrome Images (on by default, so Reduce File Size does it too; doc_optimize mono) stores a 1-bit image of one colour component (grey, indexed, a separation) or an image mask, kept with no filter or general-purpose ones, as Group 4 when that is smaller as stored; the samples decode to the same bits, so colour space, decode array and masks stay. Group 4 wins on scans; on clean computer-drawn 1-bit art Flate can be smaller, and the image then stays. Not yet: JBIG2 (lossless or lossy, which Adobe's help says beats CCITT for monochrome), monochrome downsampling, inline images, soft masks and /Mask images, rows wider than 32,767 samples. Redaction doesn't decode Group 4 yet (a mark over part of such an image removes it whole; nothing leaks), and Export ▸ Images can't export one."
[[feature]]
id = "optimize.only-if-smaller"