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From bugzi...@apache.org
Subject DO NOT REPLY [Bug 21420] New: - Support for CMYK JPGs broken
Date Tue, 08 Jul 2003 21:36:33 GMT
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http://nagoya.apache.org/bugzilla/show_bug.cgi?id=21420

Support for CMYK JPGs broken

           Summary: Support for CMYK JPGs broken
           Product: Fop
           Version: 0.20.5
          Platform: Other
        OS/Version: Other
            Status: NEW
          Severity: Normal
          Priority: Other
         Component: images
        AssignedTo: fop-dev@xml.apache.org
        ReportedBy: junk@galbraiths.org


It is well known that Adobe Photoshop for unknown reasons inverts the channel
values in a CMYK JPG file, such that 0 is black rather white.  The author of
org.apache.fop.image.JpegImage knew this and wrote support for it.

However, the condition used to determine if the JPG was generated by Photoshop
is incorrect.  JpegImage checks if the Adobe APPE marker is present in the file.
 If it is, it assumes that Photoshop created the file.  Actually, many other
applications use the Adobe APPE marker standard when creating JPG files but do
*not* invert the CMYK channel values.  As a result, these JPG files are being
displayed with inverted colors.

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