[gs-bugs] [Bug 692286] New: Image too light -- not fully opaque

bugzilla-daemon at ghostscript.com bugzilla-daemon at ghostscript.com
Thu Jun 16 20:10:28 UTC 2011


           Summary: Image too light -- not fully opaque
           Product: Ghostscript
           Version: master
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P4
         Component: Graphics Library
        AssignedTo: ray.johnston at artifex.com
        ReportedBy: ray.johnston at artifex.com
         QAContact: gs-bugs at ghostscript.com
   Estimated Hours: 0.0
          Customer: 532

Created an attachment (id=7600)
 --> (http://bugs.ghostscript.com/attachment.cgi?id=7600)

This problem shifts with resolution and band height, but I've managed to
reduce the file to show the problem with a minimal number of objects and
low resolution (96 dpi).

The command line is:

gswin32c -r96 -sDEVICE=png16m -o ta.png  ta.pdf

The "screen snapshot" image is mostly too light (the top part is OK).

This appears to be related to the painting that immediately precedes the
image being drawn, which is probably leaving the opacity set at less than
1.0 (I see 0.440002 mentioned in the -Zv output).

Note the attachment is a gzipped UNCOMPRESSED pdf that is useful for editing.

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