Affinity suite 2.5.6 – color profile bug

[LEB]

After some discussion here, I am filling this as a possible bug.

The problem:
- when I copy a screenshot on my Mac running MacOS 13.7.1 to an Affinity application, it appears dull
- however, the colours are normal on Preview and other applications
- this is independent of the application from which the screenshot is taken (Firefox, Safari, Preview...)

Solution:
The colours are correct on Affinity applications if I :
- Open the screenshot saved in Preview
- Assign an sRGB profile to the screenshot
- Open the modified image in an Affinity application

My interpretation so far:
- the screenshot is assigned the screen profile "LCD couleur" when it is produced.
- This screen profile is very close to the sRGB profile, so if I assign sRGB in Preview, the colours look good in Affinity.
- However, for some reason, the Affinity applications fail to decode "LCD couleur".

Questions:
- Is not it a bug that Affinity applications cannot take into account the "LCD Couleur" profile, when this image is rendered with the correct colours in any other application (Preview, Word, browsers)?
- Is it normal for the screen profile to be "LCD Couleur", even though my screen is a Retina XRD Display (P3-1600 nits)?
 

[NathanC]

Hi @LEB,

I do observe the described colour shift between Preview and AfPhoto, however I don't have the 'Colour LCD' profile installed, so Photo 2 appears to be  (potentially incorrectly) defaulting to the 'Display' profile which may account for this change. Could you confirm what Colour profile the screenshot(s) get assigned when opening in Photo 2?

Also, could you provide me with a copy of the 'Colour LCD' profile? This should be in /system/library/colorsync/profiles.

On 12/5/2024 at 11:53 AM, LEB said:

- Is it normal for the screen profile to be "LCD Couleur", even though my screen is a Retina XRD Display (P3-1600 nits)?

Sorry, not too sure on this one.

[LEB]

Dear @NathanC,

Here is what I see:

[NathanC]

Thanks @LEB,

Can confirm this is one we have logged internally. Screenshots with the 'Colour LCD' Profile embedded should not be imported with the generic 'Display' profile assigned as they are in Photo 2, as this profile mismatch is what causes the shift, likely due to a smaller/narrower gamut. I've updated the existing issue and bumped it with your report.

[LEB]

Wow, this is nice!

Regarding the question about the profile, it is here in the /Library/ColorSync/Profiles/Displays folder.

I am attaching it.

Color LCD-37D8832A-2D66-02CA-B9F7-8F30A301B230.icc

[LEB]

If you solve this one, it will save me a LOT of time as I will not have anymore to replace the profile for each screenshot I am processing.