[Poppler-bugs] [Bug 97103] New: Poppler incorrectly renders CMYK black color

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97103

            Bug ID: 97103
           Summary: Poppler incorrectly renders CMYK black color
           Product: poppler
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: general
          Assignee: poppler-bugs at lists.freedesktop.org
          Reporter: igor.liferenko at gmail.com

Created attachment 125362
  --> https://bugs.freedesktop.org/attachment.cgi?id=125362&action=edit
in this patch we simply use "no light" for full black ink

Hello,

If in pdf document black color is set to full black ink as CMYK(0,0,0,1), it is
displayed on monitor as RGB(35,31,32), which makes the text greyish and thus
somewhat harder to read. I checked the color by making screenshot of pdf
document and using color picker tool in GIMP. You can check this yourself by
compiling the following example by pdftex:

\pdfliteral{0 0 0 1 k}
\vrule width 1cm height 1cm
\bye

In contrast, CMYK(0,0,0,0) produces pure white color RGB(255,255,255), as it
should be.
This means that we use "full light" for no ink.
Then why we do not use "no light" for full black ink?

Please consider applying the attached patch or explain why it should not be
applied.

Regards,
Igor

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