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Different font rendering depending on image transparency

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Hi,

this is a cross-post from the Adobe Reader forum, where no one was able to help me. It is about PDF rendering issues in Acrobat Reader, concerning pdf files created with latex. I would be glad if you could help me out; I hope the "PDF language" forum is the right place to ask.

 

The original thread is here: http://forums.adobe.com/thread/710486

 

 

bersbers wrote:

 

Hi,

 

please take a look at this file:

http://www.jtartlabs.com/test/test.pdf (this is not my server and not my files, but they illustrate my problem)

 

The two pages in this file render differently on my system, as can be seen here:

Capture.PNG

 

Reader 9.3.4, Windows 7 x64, also on Windows XP SP3 32 bit

 

The file was created using tex and this minimal example:

 

\documentclass{book}
\usepackage{graphicx,lipsum}

\begin{document}
\lipsum[1]
Surrounding text is NORMAL
\includegraphics{singleclickbutton2}
\lipsum[5]
\newpage
\lipsum[1]
Surround text is BOLD
\includegraphics{singleclickbutton3}
\lipsum[5]
\end{document}

 

 

You see that there should be no difference in the pages except for two different image files, but obviously there is. This effect goes away as soon as I disable the "Smooth text" option, but this is ugly and I cannot expect my readers to do so.

 

It SEEMS that part of the problem is that singleclickbutton3 has some transparency information, while singleclickbutton2 does not. (All the files are available at http://www.jtartlabs.com/test/).

 

What causes this issue? More important, what can I do to prevent it - either in tex or using a postprocessor?

 

Thanks,

bers


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