Grzegorz MartensandClaude Opus 5.5 6ad95f0aa4 M11: an indexed image's palette is read once it matters, within 4 KiB; a colour key keeps its image ...

From a review of the spellings an indexed image can take:
- The palette was read for every 1-bit indexed image, resampled or not, and twice each. Images
  share a table, so 1,000 images sharing one with 16 MiB of raw data took 16 to 60 s, none of
  them resampled. It is now read only for an image about to be resampled, and a table over
  4 KiB is refused before it is copied or decoded, since no palette needs that.
- A colour key can hide the dark sample a tie goes to, so a thin rule of the other was lost: a
  white rule on a hidden black went from 255 to the backdrop's 128. An image with a colour key
  now keeps its resolution. Grey had this since #5426 and is covered too.
- `/Indexed` by reference, and a base of `[/DeviceRGB]`, are the same colour space and are read
  so. `/I`, an inline abbreviation, and a real hival aren't, and such an image is left alone.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AmsdeUCdTaD72jkDw2pJKY

2026-10-31 01:05:58 +01:00

..

jpeg_color_transform.rs

style: rustfmt the cancellation test

2026-10-23 10:53:16 +02:00

optimize.rs

M11: an indexed image's palette is read once it matters, within 4 KiB; a colour key keeps its image

2026-10-31 01:05:58 +01:00