Desktop Background Images Dithering

All of my desktop background images have been dithering, despite the fact that my display is set to 32-bit color. This can be demonstrated by opening up the image used for the desktop in an image-editing application and viewing them both side-by-side. Here's a screenshot of such a comparison:
This is a major bummer - anyone have an idea what is wrong?

I should have mentioned that the dimensions of the background image exactly match the resolution of the monitor (1280x1024).
Also, yes, it is an LCD monitor, but it is hooked up via DVI.
I am wondering if it might have to do with the display card hardware (GeForce FX 5200), as I did not have this problem under the same circumstances, in tiger, but under different hardware...
So, no, still not solved - but thanks for your input.

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    ===============
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    Great news! I found the solution and all props and credit goes to
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