Hya,

I am totally lost. Situation is:

I am making a pdf file for presentation using pdflatex with ppower4 on Debian lenny.

There are several pages with almost identical image, the difference is slight brightness change in some part, so that that part looks like spotlighted.

Problem is: images included by includegraphics look different across computers. Some of them, brightness changes entirely.

I used same technique while ago without any problem. (I do not know what kind of computer used for that presentation. And all of computers I tested behaved well.)

At this moment, xpdf on lenny and acrobat on Mac OS/X 10.4 work as expected, however, acroread on MacOS/X 10.3, Windoes and Debian lenny do not.

I need to figure out. I am not sure whether this is a problem with pdf file or application side (acroread xpdf..)

Does anybody know?

Happy Penguins!

Are you saying that on some computers, a slide without highlighting looks normal while one with highlighting, the whole slide is highlighted?

Could you increase the highlighting slightly and see if the problem persists? I'm wondering if there is some kind of normalization function (for gamma on the monitor) performed somewhere along the chain and the difference is on the cusp of those computers color profile changes. There are only 256 levels in 24 bit graphics for a single color. The word "slight" stood out for me when I read your message.

Thanks for your time.
Yes.
Yes.
Yes, I thought so. I looked for some sort of options in tex source, without success.This may be a clue. The difference is different across computers... Gamma thing??

Happy Penguins!