[Poppler-bugs] [Bug 31926] pdftops-0.15.2 -level1sep inverts the image mask polarity

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=31926

--- Comment #6 from William Bader <williambader at hotmail.com> 2010-11-26 17:20:11 PST ---
You are right.  My new PDF draws through a pattern similar to bug 22216.
In PSOutputDev::drawImageMask(), state->getFillColorSpace()->getMode() ==
csPattern, which is currently not handled for level1 and level1sep.

My goal is to create an EPS that I can separate using a prologue that redefines
color operators.  I do not need a strictly level1 eps.  I just need something
that works with my separation prologue or that I can enhance my separation
prologue to support.  When I use -level2sep with the PDF attached to this
report and try to separate the eps, gs gets "/typecheck in --image--" on the
second image, which I think is the image with the pattern that shows as a white
bar with -level1sep.

Since the attached PDF displays correctly by flipping the polarity argument to
imagemask, the pattern is probably trivial, either all set or all clear.  As a
partial fix, would it be possible to scan the data to check for special cases
where inverting the imagemask polarity will work?

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