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I have a problem visualizing my Beamer presentation with Acrobat Reader 9.5.1 on Ubuntu 12.04. I'm using the PaloAlto theme and when I visualize the presentation in Acrobat on some random frames the structure's theme changes becoming brighter and this is very annoying.

Surfing the web I found a solution that seemed to work for many lucky people having the same problem:

\pdfpageattr {/Group << /S /Transparency /I true /CS /DeviceRGB>>}

but unfortunately I wasn't lucky enough and adding that to my document's preamble didn't solved the problem. I tried to visualize the presentation with Evince, Okular and Windows 7 (Acrobat Reader) and all worked fine.

Thank you in advance for your time.

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  • are you using transparent images in your presentation? Commented Jul 8, 2012 at 22:39
  • No, I'm using a standard \includegraphics{myfig.pdf} Commented Jul 8, 2012 at 22:47
  • usually, adobe reader does this when it encounters transparency elements such as png. Commented Jul 8, 2012 at 22:52
  • It does it at the first slide after the summary and there are no .png files!! Does this mean that I cannot get rid of this boring effect? i have to do the presentation with Acrobat... Commented Jul 8, 2012 at 22:58
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    That could be caused by transparency or by RGB-vs-CMYK issues, so the problem probably happens on pages only where you used \includegraphics{xyz.pdf}. Could you make that pdf available for inspection? possibly related question: tex.stackexchange.com/questions/16061/… Commented Jul 9, 2012 at 12:36

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This is a duplicate of \includegraphics{} color problem. A solution for your special case can be found in the comment by Martin Scharrer (so credits should go to him).
In the document you made available via Dropbox, you have the line

\usepackage{xcolor}

You need to change it to

\usepackage[cmyk]{xcolor}

If that gives an option clash, you can instead use

\PassOptionsToPackage{cmyk}{xcolor}

As pointed out by egreg, the \PassOptionsToPackage route is for the cases when xcolor is loaded by the class or some package and the command should go before \documentclass{beamer}

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  • Why not simply \usepackage[cmyk]{xcolor}? The \PassOptionsToPackage route is for the cases when xcolor is loaded by the class or some package (it should go before \documentclass). Commented Jul 9, 2012 at 14:06
  • I was getting an option clash and thus simply followed Martin Scharrers comment in the linked question (without, I admit, understanding why the option clash occured). Commented Jul 9, 2012 at 14:16
  • The two ways are alternative; why don't you edit your answer to make this clear? Commented Jul 9, 2012 at 14:22
  • Thanks, I learned something new and have edited the answer Commented Jul 9, 2012 at 14:31
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    I've tried both solutions but neither is perfectly working. The effect is somehow reduced, faded I'd say, but it is still noticeable. For the record \usepackage[cymk]{xcolor} gave me an Option Clash. Commented Jul 9, 2012 at 15:36

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