Images in PDFs are too dark - wrong color, brightness, contrast

I use my IPAD mainly for viewing medical books, e.g. radiological atlases. Most come in PDF format and most don't look much different on the IPAD than they do on PC. But it is very frustrating to find that the most important book I need looks incredibly bad on the IPAD - it's color reproduction of images is very poor compared to the PC. I've tried all possible viewers, the problem must be in the PDF rendering engine of the IPAD.
Is this problem already known and is there a solution?
Thank you for your help.

Hi, did anybody read my fix to the problem from 19.09.2011?
Here is another one I found on ipadforums.net:
Fix to PDF Image problem
Little after the fact, but in case any one googles to this like I did, I did find a work around for this. Only on a mac... I am running Lion and I simple Save as in Preview didn't do the trick for me.
Two options, One a little easier then the other. 1. Open the file in preview. Chose File-> Export. Set the obvious and then under quartz filter select reduce file size. Then hit save. Put the file on your iPad and you should be good to go. This will also circumvent and "large" file size issues you may get from other ways to "fix" this. 2. If you need to have the images in even higher quality, as the first option may decrease the quality slightly then there are more steps.
Select the file you need and choose open with-> ColorSync Utility. Top left of the screen is the button to open filter inspector (three circles, one green, blue and red). Click the downward triangle next to Reduce file size and select duplicate. Rename the copy to anything and then Press the downward triangle on this file. Select Add domains. Then Expand the field (triangle on the left of the name). Expand Image Expansion. Change the quality bar to max. Expand Domains and check PDF workflows. Close the filters box.
On the bottom of the original screen that was opened there is a filter option. Select the file you just created and click apply. Then save the file and you are good to go with a higher quality. This will fix any color issues with pdf images on iPads. I had pdf images that the colors were off on, almost negative and this worked like a charm. Once its set up its very easy and quick for future pdf image problems.

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