Dithered Colors in iPhoto 6 on iMac 20" Intel Core Duo with 1.5GB RAM

Hi.
I have a 20" iMac Intel Core Duo. Shoot at 100 ISO, sRGB, with a Canon Digital Rebel XT in a studio setting. When viewing the images in iPhoto they have a noticeable dithering on the colors, especially on the seamless. Sometimes it's bad.
If I view them full screen in Comparison mode I see it there, too. Detail is intact, but the colors dither. Doesn't happen in Photoshop CS2, and I don't remember if it happens in Preview...
Any ideas of what is going on?

Scott:
Are you running the latest Quicktime version, 7.1.5? If not that may have something to do with it. Also what color profile are the files assigned? You can check that out by viewing them with Preview and using the Summary pane of the Info window there. Are you shoot RAW and importing those files? If so there may be addition issues that I can't help you with although as I understand it iPhoto creates a jpg file from the RAW file upon import and that's what you're working with.
Make sure your monitor is set to millions. Although since CS2 doesn't show that effect I'm guessing it is set to that. But check anyway.
Do you Twango?
TIP: For insurance against the iPhoto database corruption that many users have experienced I recommend making a backup copy of the Library6.iPhoto database file and keep it current. If problems crop up where iPhoto suddenly can't see any photos or thinks there are no photos in the library, replacing the working Library6.iPhoto file with the backup will often get the library back. By keeping it current I mean backup after each import and/or any serious editing or work on books, slideshows, calendars, cards, etc. That insures that if a problem pops up and you do need to replace the database file, you'll retain all those efforts. It doesn't take long to make the backup and it's good insurance.
I've written an Automator workflow application (requires Tiger), iPhoto dB File Backup, that will copy the selected Library6.iPhoto file from your iPhoto Library folder to the Pictures folder, replacing any previous version of it. You can download it at Toad's Cellar. Be sure to read the Read Me pdf file.

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