ljkxandClaude Opus 5.5 d2576b27eb Profile mismatch: compare profiles by colour, not bytes (#394) ...

Opening any file Photoshop tagged with sRGB IEC61966-2.1 asked
"Embedded Profile Mismatch: sRGB IEC61966-2.1 vs sRGB IEC61966-2.1":
open_policy compared a hash of the ICC bytes, and Photoshop's v2 profile
(1024-entry tables) and the built-in v4 sRGB (parametric curves) are the
same colours in different bytes. 32-bit documents in Photoshop's linear
sRGB missed the stay-linear exception for the same reason.

Add Profile::same_colors: same colour space and every sample of a device
grid within dE76 0.5 through both (re-encoding costs 0.025; moving the
red primary 2% costs 1.0). Colours are compared rather than round-tripped
because CMYK -> PCS -> CMYK is not an identity even for one profile.

Of the 75 profile-tagged PSDs in the test corpora, all 75 prompted on
open; now 6 do (Adobe RGB, Gray Gamma 2.2, SWOP), each a real mismatch.

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

2026-10-07 10:43:18 +07:00

..

bench.rs

more algorithms, progress

2026-10-01 08:25:06 -04:00

cms.rs

Profile mismatch: compare profiles by colour, not bytes (#394)

2026-10-07 10:43:18 +07:00

regen.rs

more algorithms, progress

2026-10-01 08:25:06 -04:00