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Published 20 hours ago • verified publisher icon jurplel

(No CMYK Color support) The colors of large image shift towards blue/green

Open destroy314 opened this issue 1 year ago • 4 comments

Environment:

  • OS: macOS 14.2.1 (23C71) with Apple XDR Display (P3-1600 nits)
  • qView version: 6.1

Information: The left is the Preview.app, please note the file size in the title bar, this behavior is also found in large tif/psd files I have. Change color space conversion has nothing to do with it. 2024-01-10_22-29-40 2024-01-10_22-28-06

destroy314 avatar Jan 12 '24 07:01 destroy314

Interesting. Can you send the test images so I could reproduce it in the future?

jurplel avatar Jan 12 '24 22:01 jurplel

Oops, I forgot. GoogelDrive

destroy314 avatar Jan 13 '24 05:01 destroy314

This is because the image uses CMYK color and Qt wasn't capable of handling it properly until recently. There were two recent changes (here and here), one or both of which has fixed the colors when I try this and other CMYK images in a Qt preview release. The bad news - I don't believe this is being cherry-picked back to Qt 6.7, in which case we'll have to wait until Qt 6.8 is released towards the end of the year.

jdpurcell avatar May 11 '24 21:05 jdpurcell

IMO another case for investigating a migration away from qt image processing

jurplel avatar Jun 25 '24 07:06 jurplel