[Poppler-bugs] [Bug 51822] New: DeviceN images with alternate Lab colorspace in level 3 PostScript

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=51822

             Bug #: 51822
           Summary: DeviceN images with alternate Lab colorspace in level
                    3 PostScript
    Classification: Unclassified
           Product: poppler
           Version: unspecified
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: general
        AssignedTo: poppler-bugs at lists.freedesktop.org
        ReportedBy: Thomas.Freitag at alfa.de


Created attachment 63925
  --> https://bugs.freedesktop.org/attachment.cgi?id=63925
Solves the lab problem with indexed deviceN images

Because You marked bug 51548 as fixed, I open now a new bug for a patch which
solves the problem with DeviceN images with alternate Lab colorspace in level 3
PostScript.
After my discussion with the ghostscript guys (s.
http://bugs.ghostscript.com/show_bug.cgi?id=693163) I was able to solve that
problem, too.
As a testcase You can use the samples of the freely available patches from the
Ghent PDF workgroup, 08_DeviceN patches, creating the output with pdftops and
option level3 or level3sep.
BTW, when examine the output of these samples I encountered that also filling
with DeviceN colors is not correct with level3 or level3sep option (not the
images, I mean the square ahead "Spot color gradient"): even if the DeviceN
colorspace is written in the PostScript output, the filling is done with
setcmykcolor and therefore looses the correct (spot) color information and
cannot be correctly separated. You can see that only when You rip it in a CMYK
colorspace with ghostscript, i.e. -dDEVICE=tiffcmyk. Then You'll get an X
instead of the correct check mark. But this is another problem and therefore
I'll open an additional bug after I be able to solve that.

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