[Poppler-bugs] [Bug 68986] pdftoppm doesn't render eci_altona-test-suite-v2_technical2_x4.pdf correctly

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=68986

--- Comment #27 from Thomas Freitag <Thomas.Freitag at alfa.de> ---
The output You see with my patch is correct in some way, I try to explain:

1. The said PDF consists of one image with colorspace DeviceCMYK
2. The PDF specifies that the DefaultCMYK is an icc based colorspace
3. The PDF has no OutputIntents, therefore poppler took the sRGB profile to
convert the CMYK image to sRGB
4. But the produced PNG has neither a profile nor it has the marker that it is
sRBG, it just tells it is RGB

So it is simply a problem of color transformation. I send You in private a
display.icc profile which converts the image to RGB without any further
information, and in addition a profile which is quite similar to the one
poppler uses.

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