https://bugs.kde.org/show_bug.cgi?id=412604
Bug ID: 412604
Summary: [CMYK] CGATS21_CRPC1.icc has a different rendering
between softproofed and converted
Product: krita
Version: 4.2.7
Platform: Appimage
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Color models
Assignee: krita-bugs-n...@kde.org
Reporter: i...@davidrevoy.com
Target Milestone: ---
Created attachment 123013
--> https://bugs.kde.org/attachment.cgi?id=123013&action=edit
^ screenshot of the bug
Hi,
I'm starting a collab with a print factory using CGATS21_CRPC1.icc CMK color
profile. Krita "Image → Convert image color space" looks great with it but if I
use the same profile and try to softproof my sRGB art, it looks really
different (bleached, white).
TO REPRODUCE:
=============
1. Download the ICC profile:
https://onebookshelfpublisherservice.zendesk.com/hc/en-us/article_attachments/360036082354/CGATS21_CRPC1.icc
2. Open the same sRGB artwork or photo twice in Krita.
3. On the first; go to "Image → Convert image color space" and convert it to
CGATS21_CRPC1.icc 8bit CMYK perceptual.
4. On the second; go to settings → configure Krita → Color management →
Softproofing" and set CGATS21_CRPC1.icc 8bit CMYK perceptual. Press Ok, then
activate softproofing (Ctrl+Y or View → Soft Proofing in the menu).
RESULT:
=======
The color looks really different between the two documents.
EXPECTED:
=========
Getting the same rendering on both, to continue my artworks in RGB and correct
them to be compliant with the printer's profile thanks to Soft Proofing.
NOTES & WORKAROUND
==================
Krita is not alone to render this way with this type of gamma issue: Scribus
and GIMP also softproof it exactly the same way. To workaround this issue with
this profile; Soft Proof the document with
http://www.color.org/registry/CGATS21_CRPC6.xalter (download button down this
page); it has less gamma issue and matches more or less the color restriction
of CGATS21_CRPC1 for Soft Proofing (if I compare to the converted version).
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