[Poppler-bugs] [Bug 92381] Poppler doesn't display text in separation colorspace with alternate colorspace DeviceGray

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92381

--- Comment #5 from Thomas Freitag <Thomas.Freitag at alfa.de> ---
Sorry for any confusing comments before. I made a lot of tests with acrobat and
wondered about the results until I figured out what is the reason, s. chapter
8.6.6.4 of the spec:

At the moment the colour space is set to a Separation space, the conforming
reader shall determine whether the device has an available colorant
corresponding to the name of the requested space. If so, the conforming reader
shall ignore the alternateSpace and tintTransform parameters; subsequent
painting operations within the space shall apply the designated colorant
directly, according to the tint values supplied.

Since the colorant is Black and this is always available, alternateSpace and
tintTransform parameters must be ignored and the tint value is used to paint on
the Black colorant directly. So my former patch was definitely wrong and I will
provide a new one according to this spec.

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