[gs-bugs] [Bug 692609] New: Halftoned fill color rectangle has underlying problem.

bugzilla-daemon at ghostscript.com bugzilla-daemon at ghostscript.com
Mon Oct 17 10:28:58 UTC 2011


http://bugs.ghostscript.com/show_bug.cgi?id=692609

           Summary: Halftoned fill color rectangle has underlying problem.
           Product: Ghostscript
           Version: master
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Severity: normal
          Priority: P4
         Component: Color
        AssignedTo: michael.vrhel at artifex.com
        ReportedBy: robin.watts at artifex.com
         QAContact: gs-bugs at ghostscript.com


In investigating the pamcmyk4 vs plank differences, I came across problems when
running the following file at 300dpi, both banded and unbanded with both plank
and pamcymk4.

 tests_private/pcl/pcl5cats/Subset/PWEP6SC1.BIN

If you examine gx_dc_ht_colored_fill_rectangle (in gxcht.c) you'll see that it
falls into 2 cases; the first is an 'optimisation' case for the second.

As such disabling the first case should cause no differences in the output at
all - just a slowdown. Unfortunately, testing shows this not to be true.

This isn't a plank vs pamcmyk4 bug, so I'm trying to avoid burning more time on
it now - but I am raising this bug so the problem isn't forgotten.

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