[poppler] Pdf-transparency.

Leonard Rosenthol leonardr at pdfsages.com
Tue Aug 23 05:59:56 PDT 2005

At 08:57 AM 8/23/2005, Lukasz Kwestarz wrote:
>Ok I have to use gs operator to make my box transparency.


>But when I put this (part of code in bold):
>in the pdf file the colors are darker than before.

         If you NEVER use the gs operator - then the fact that you 
have an ExtGState is irrelevant.  It is NOT used.

         What you may be seeing, assuming you are using Acrobat 
Reader to view, is that Acrobat uses different techniques to render 
100% opaque pages vs. those with some transparency.  So things like 
anti-aliasing and such will change and may appear different to 
you.  But it isn'.

>That is why I wrote that i did not have to use the gs. I have to use 
>it when i want to have a transparency,

         Yes, you do.

         You don't have to use it when you do NOT use transparency - 
the defaults are fine.  But if you WANT transparency, you need to use 
it along with a gs.


Leonard Rosenthol                            <mailto:leonardr at pdfsages.com>
Chief Technical Officer                      <http://www.pdfsages.com>
PDF Sages, Inc.                              215-938-7080 (voice)
                                              215-938-0880 (fax)
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