[gs-bugs] [Bug 691477] New: Differences in tiff24nc and tiff32nc output

bugzilla-daemon at ghostscript.com bugzilla-daemon at ghostscript.com
Mon Jul 19 01:37:24 UTC 2010


http://bugs.ghostscript.com/show_bug.cgi?id=691477

           Summary: Differences in tiff24nc and tiff32nc output
           Product: Ghostscript
           Version: HEAD
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P4
         Component: Color
        AssignedTo: michael.vrhel at artifex.com
        ReportedBy: marcos.woehrmann at artifex.com
         QAContact: gs-bugs at ghostscript.com
   Estimated Hours: 0.0


Created an attachment (id=6506)
 --> (http://bugs.ghostscript.com/attachment.cgi?id=6506)
screenshot.png

Converting the file 29-07A.PS (found in tests_private/ps/ps3cet/) with head
(r11519) to a 32 bit cmyk format (tiff32nc) results in a very different image
on page 3 than converting to a 24 bit rgb format (tiff24nc), see attached
screenshot.

This is somewhat of a progression, since before the icc_work branch merge the
differences were even more pronounced (all of the gradient bars which contained
any color were rendered entirely black).

Example command line2:

  bin/gs -sDEVICE=tiff24nc -o test24.tif ./29-07A.PS
  bin/gs -sDEVICE=tiff32nc -o test32.tif ./29-07A.PS

Opening the file in Adobe Acrobat 9.3.3 and saving as an RGB or CMYK TIFF
results in the same image, which is an hybrid of Ghostscript output.  The first
6 bands on page 3 match Ghostscript RGB output and the final 4 bands match
Ghostscript CMYK output, see attached files.

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