4 Replies Latest reply on Apr 11, 2011 8:40 PM by mcgarrrnignle

# Different font rendering depending on image transparency

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:

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

• ###### 1. Re: Different font rendering depending on image transparency

Generally Reader users have no experience with Tex nor with creating pdf files. People in the Acrobat forum are better able to help since they create pdf files. However, since you are not using Acrobat they may or may not wish to help.

• ###### 2. Re: Different font rendering depending on image transparency

Hi,

I did as you suggested. The repost is in the "PDF language" forum, and we have an indication that the pdf file might be ambiguous as to the choice of a transparency blending space:

However, in the meantime, I noticed that this issue is not (or hardly) noticeable if the file is opened as the first file in the session. However, as soon as one file (the same or another one) has been opened (and possibly closed - does not matter as long as the Reader stays open) and the file in question is loaded by any means (drag&drop, File-Open, Explorer double-click), it becomes really ugly. I guess this is why many people in the discussion boards have a hard time reproducing this issue, leading to the assumption that it is very system specific. I assume it is quite general.

In any case, if a file looks differently depending on whether another file has been open before, this is DEFINITELY a thing to look into for the Reader guys, wouldn't you say?

Best regards,
bersbers

• ###### 3. Re: Different font rendering depending on image transparency

This is not a forum is not a link to Adobe tech support. We are just fellow users helping other users. If there is a bug no one here can fix it. No one here has an in to tech support, not even the forum hosts. If you wish to submit a bug report, use this link:

...Mike

• ###### 4. Re: Different font rendering depending on image transparency

Hi all,