connection() scaled the PCS by src.media_white() / dst.media_white() with
no check on the divisor, so a v4 profile whose wtpt tag holds zeros (parsed
and stored verbatim) gave a NaN scale, and every colour through a direct
absolute transform or a paper-simulating proof came out NaN. The transform
is now refused with CmsError::Invalid when either white has a zero,
negative or non-finite component; the other intents never divide by it and
are unchanged.
Co-authored-by: wstock <1394687+wstock@users.noreply.github.com>
Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com>
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>
ha1des