Problems with screen saver image quality

Just got a MPB 15 inch. Very happy with it but have a small problem with the screen saver. I use my i Photo folders as the source for screen saver images. Some photos are shown in very good quality but others are very poor - as if low res. The original images are all of the same high quality. Seems to occur whichever video setting is used under power saving. A minor issue I now but any ideas?

Hi, Mark. Apparently some of the photos being used are low-resolution thumbnails, not full-resolution images.
What version of iPhoto do you have, and which OS version are you running? On my MBP running 10.5.6 and iPhoto 7.1.5, "All folders" is not an option in the Screensaver pane of System Prefs, so I don't know what you're actually choosing. But if I select "Pictures" (which refers to the Pictures folder in my Home folder), then the screensaver uses every .jpg file that it finds in any of the several iPhoto Libraries inside my Pictures folder. The thumbnails created by iPhoto are .jpgs, so they get used by the screensaver along with full-size high-resolution images.
The solution is not to select a folder that contains any thumbnails.

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