[gs-bugs] [Bug 689811] New: Custom Color Callbacks not working with banding

bugs.ghostscript.com-bugzilla-daemon at ghostscript.com bugs.ghostscript.com-bugzilla-daemon at ghostscript.com
Wed Apr 30 13:48:02 PDT 2008


http://bugs.ghostscript.com/show_bug.cgi?id=689811

           Summary: Custom Color Callbacks not working with banding
           Product: Ghostscript
           Version: HEAD
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P4
         Component: Color
        AssignedTo: ralph.giles at artifex.com
        ReportedBy: ralph.giles at artifex.com
         QAContact: gs-bugs at ghostscript.com


After compiling Ghostscript with ENABLE_CUSTOM_COLOR_CALLBACK = 1 (gsnamecl.h)
and OBJECT_TYPE_EXAMPLE = 1 (gsncdummy.c) The following commandline generates
output tinted by object type, showing that the custom color callbacks are being
called:

debugobj/gs -sDEVICE=tiff32nc -dBufferSpace=100000000 -o test-300.tiff -r300 -c
"<< /CustomColorCallback 32 string .pantonecallback >> setsystemparams" -f
../tests_private/comparefiles/Altona_Visual_bb_1v1_x3.pdf

However, running the same command at 400 dpi:

debugobj/gs -sDEVICE=tiff32nc -dBufferSpace=100000000 -o test-400.tiff -r400 -c
"<< /CustomColorCallback 32 string .pantonecallback >> setsystemparams" -f
../tests_private/comparefiles/Altona_Visual_bb_1v1_x3.pdf

Does not show the object tint on the images, indicating that the custom color
callbacks are not invoked in the same cases. The first command doesn't band (as
shown by -ZL) while the second does.



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