"pixelated" effect on printed photos

I burn my iPhotos to CD then take them to (various) professional or discount photolabs for printing. They return looking oddly "pixelated": rather than a clean clear photo, you can actually see tiny pixels. The CD is always opened on a non-Mac computer at the various photolabs (it's happened regardless of where I take them), and often, the technician tells me there are "multiple files" of the same photos - asking me which ones to print. Some have this effect, others I seem to get lucky on and come out clear. This happened even before I upgraded to iPhoto6. Any one with any thoughts? I burn directly from my iPhoto albums, and it doesn't matter whether I burn an existing album, or move the ones I want into a newly created album. Thanks!

Gail
Do you use the Share -> Burn command to create these discs?
The best way to do this - and make sure there are no multiples, is to go File -> Export and export your pics to a folder on the desktop, then burn that folder using the Finder. That way you'll get a single version of each pic.
My guess is that they're printing the one's in the Data Folder - which are the thumbnails that the app uses to display the pics in the iPhoto Window. These are tiny low resolution files, hence the pixellation.
Regards
TD

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"pixelated" effect on printed photos

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