Odd glitch in pdf creator output

From	mathog <dmathog@gmail.com>
Newsgroups	comp.lang.postscript
Subject	Odd glitch in pdf creator output
Date	2015-10-02 10:33 -0700
Organization	A noiseless patient Spider
Message-ID	<mumf44$o4$1@dont-email.me> (permalink)

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Hi,

When converting from within Powerpoint 2010 to PDF using PDF creator 2.0 
(which is I believe just a wrapper around gnuscript) the resulting PDF 
for the example below has fine lines in the colored blocks, like some 
sort of aliasing defect.  Zooming in or out in the PDF changes the 
pattern of those lines.  The blocks have a transparency of 50%.

   http://saf.bio.caltech.edu/pub/pickup/pdfcreator_glitch.ppt
   http://saf.bio.caltech.edu/pub/pickup/pdfcreator_glitch.pdf

(These are retrieve only links - no browsing in the directory.)

When the same conversion was performed with Acrobat XI pro the blocks 
remained solid.  Acrobat used the PDF 1.5 standard, PDF Creator the 1.4 
standard, so it could be that, some difference in the handling of 
transparency between those two standards.  However, I don't see any 
setting in the PDF Creator interface to change which PDF standard it is 
using.

Is there a way to get PDF Creator to do transparency without the 
dithering (or whatever it used)?


Thanks,

David Mathog

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Odd glitch in pdf creator output mathog <dmathog@gmail.com> - 2015-10-02 10:33 -0700

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