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M11: Reduce file size shrinks office scans, and never saves a bigger copy (refs #490) (#849)

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Office scanners write the default decode array (/Decode [0 1 0 1 0 1]) on their page
images. Reduce skipped every image with a decode array, so a scan stayed the same
size. The default array is now treated as absent; any other array still skips the
image.

Reduce also saved its copy even when it wasn't smaller, reported as "-N% smaller".
It now saves nothing and says the file is already as small as it can be made;
doc_reduce returns "written": false. Optimize PDF still saves (what it discards
may matter more than the size) but says "not smaller".

Co-authored-by: Andrew Taylor <andrew.taylor@tayeng.com>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
Co-authored-by: Brandon Thomas <echelon@gmail.com>
This commit is contained in:
taylorandrew07-lab
2026-10-10 16:20:50 -04:00
committed by GitHub
co-authored by Andrew Taylor Claude Opus 5.5 Brandon Thomas
parent 74be522c18
commit 4fd2c2b3a3
26 changed files with 178 additions and 53 deletions
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parity/acrobat-features.toml
+2 -2
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@@ -7130,8 +7130,8 @@ milestone = "M11"
status = "shipped"
commands = ["optimize.reduce"]
tools = ["doc_reduce"]
evidence = ["crates/ui-egui/tests/create.rs::reduce_file_size_writes_a_compact_copy", "crates/engine/src/tests.rs::create_and_reduce", "crates/automation/tests/automation.rs::creating_and_reducing_through_tools", "crates/automation/tests/automation.rs::optimizing_through_tools"]
notes = "images above 225 ppi to 150 ppi JPEG medium, thumbnails dropped, resources merged, object streams; runs in the background with a progress bar and Cancel"
evidence = ["crates/ui-egui/tests/create.rs::reduce_file_size_writes_a_compact_copy", "crates/ui-egui/tests/create.rs::reduce_file_size_saves_nothing_when_the_file_is_already_small", "crates/engine/src/tests.rs::create_and_reduce", "crates/automation/tests/automation.rs::creating_and_reducing_through_tools", "crates/automation/tests/automation.rs::optimizing_through_tools", "crates/optimize/tests/optimize.rs::an_identity_decode_array_does_not_stop_reduce"]
notes = "images above 225 ppi to 150 ppi JPEG medium, thumbnails dropped, resources merged, object streams; scanner images with the default decode array are included; a copy that isn't smaller is not saved (\"already as small as it can be made\"); runs in the background with a progress bar and Cancel"
[[feature]]
id = "optimize.compatibility-level"