[okular] [Bug 508719] Blended colors in CMYK color blending space rendered incorrectly

[bugzilla_noreply at kde.org]

https://bugs.kde.org/show_bug.cgi?id=508719

--- Comment #1 from heinrich.bohne at gmx.at ---
I have created a better sample document to demonstrate the problem more
clearly. It contains the same text three times in a row. The middle text has
the blend mode set to exclusion and the blending color space set to a CMYK
profile. The first and the third text do not have a blend mode. The first text
has its color hardcoded to the color that would result from the second text's
blend being performed in RGB space, and the third text has the color hardcoded
that would result from the blend being perfomed in a CMYK blending color space.
 Since the second text's blending color space is CMYK, its visible color should
match that of the third text, as is the case when opening the file in the
desktop version of Adobe Acrobat Reader (but not in the mobile version – this
is an intended limitation of the mobile version to simplify and improve
performance, so the effect can only be observed when using a desktop version of
Acrobat Reader or Acrobat). However, when viewing the file in Okular with
"overprint preview" disabled, the color of the second text is very similar to
that of the first text, which means that the color blend is probably performed
in an RGB space, albeit not the same one that was used in the source file from
which the PDF file was created.

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