[gs-bugs] [Bug 689934] New: pngalpha device doesn't write full white background

bugs.ghostscript.com-bugzilla-daemon at ghostscript.com bugs.ghostscript.com-bugzilla-daemon at ghostscript.com
Fri Jul 4 02:04:42 PDT 2008


http://bugs.ghostscript.com/show_bug.cgi?id=689934

           Summary: pngalpha device doesn't write full white background
           Product: Ghostscript
           Version: 8.62
          Platform: PC
        OS/Version: Windows XP
            Status: UNCONFIRMED
          Severity: major
          Priority: P4
         Component: Other Driver
        AssignedTo: support at artifex.com
        ReportedBy: wh_ng at gmx.de
         QAContact: gs-bugs at ghostscript.com


Sorry if this bug has already been reported before, but I could not find any 
similar report in the tracker.

Using Ghostscript to convert a b&w eps to png, the png gets a background color 
of 254,254,254 instead of 255,255,255.
Calling command:
gswin32c -q -dQUIET -dBATCH -dNOPAUSE -dNOPROMPT -sDEVICE=pngalpha -
dTextAlphaBits=4 -dGraphicsAlphaBits=4 "-r300x300" -g79x42 -
sOutputFile=test.png l2r_0001.eps
Using -sDEVICE=png16m gives correct white color.

You can download the eps from
http://freenet-homepage.de/wh_ew/test/
click on "generated eps picture"
(The bug was first experienced calling Ghostscript via ImageMagick's "convert".)



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