[NTG-pdftex] [ pdftex-Bugs-723 ] Pale colors when using transparency in PNG graphics

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Thu Jan 25 16:06:29 CET 2007


Bugs item #723, was opened at 2007-01-25 06:27
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Category: Image inclusion
Group: v1.30.0
Status: Closed
Resolution: Works For Me
Priority: 5
Submitted By: Mark Henning (markhe)
Assigned to: Martin Schröder (oneiros)
Summary: Pale colors when using transparency in PNG graphics

Initial Comment:
Hi at all!

I hope this is the right place to report this problem:

If there is any transparency definition in a PNG file 
(e.g. transparency by a certain color or given by a 
mask), then all graphics on the page show pale colors. 
Graphics on pages before or after this page show normal 
colors. This is confirmed in several versions of Adobe 
Acrobat Reader. Ghostview/Ghostscript does not show 
this behaviour. The reason for this viewer-dependency 
might be a missing transparency-definition in the PDF 
file which makes it ambiguous, as reported by Andreas 
Lobinger in de.comp.text.tex; thread "Blasse Farben bei 
transparentem PNG in pdftex".


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>Comment By: Mark Henning (markhe)
Date: 2007-01-25 15:06

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I rechecked with Adobe Acrobat 7.0 and Adobe Acrobat 7.0.9 
on Win2000 SP4, both showed the color differences (see the 
PNG file I uploaded. It shows a direct comparison.). If you 
checked the PDF and say that it is O.K., then there must be 
a bug in Adobe Reader. I will contact Adobe then.


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Comment By: Martin Schröder (oneiros)
Date: 2007-01-25 13:53

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I see no problems with AR 7.0.9, kpdf 0.5.1 and gs 8.54 on
SUSE 10.1.

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Comment By: Martin Schröder (oneiros)
Date: 2007-01-25 13:51

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Pointer to the threat on dctt:
http://groups.google.de/group/de.comp.text.tex/browse_thread/thread/758dcc47273b4e7d/

An example:
http://www.homolog.de/temp/PNGTransparencyBug.zip

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