1619332 - Undersaturation with certain color profiles

Status: NEW

(Core :: Graphics: Color Management, defect, P3)

Description

[Andrew Osmond [:aosmond] (he/him)]

Two images appear to have values that are slightly too low (2-10) to be mere floating point errors when color management for BMP is enabled via bug 1615394.

https://searchfox.org/mozilla-central/source/image/test/reftest/bmp/bmpsuite/g/pal8v4.bmp
https://searchfox.org/mozilla-central/source/image/test/reftest/bmp/bmpsuite/q/rgb24prof2.bmp

We match the behaviour in other decoders and Chrome as far as construction of the parameters to create the ICC profiles goes, but we get a different result. This warrants further investigation. In particular the pal8v4.bmp case is of note, because it is a simple profile that we generate some a few parameters, and thus might be the simpler case to investigate.

Comment 1

[Asif Youssuff]

Reported in the wild: https://www.reddit.com/r/firefox/comments/g1i13u/ico_icons_dont_display_correctly_anymore/

Comment 2

[coffinz]

This is very annoying. All my icons now have dull colors.
Either Firefox isn't using color management correctly, or it is, but it was a bad idea to use it for icons in the first place.
This affects all icons, even in the Search Engines options section.