Pictures screen saver.  My "best" photos look granular. Why?

Hello. I have a number of photos saved on my mac. Some were taken years ago with a cheap digital camera. Some were scanned in recently using a scanner. Others were taken using a more expensive, good quality, slr camera. I refer to the slr pictures as my "best" pictures for this particular question.
When I view these photos through iphoto they are excellent. When the play through the atv as a screen saver, they look excellent. Yet, if I select these photos to play as the screen saver "one at a time" type of mode (i.e. not the collage mode), the "best" pictures look granular or blurry. While the old photos all look great.
I've played around with the options in the screen saver and it didn't do any good. Just cropped or otherwise move the photos around and they didn't look any better.
What am I missing here that would cause these otherwise great pictures to look bad in the screen saver on the mac?
Thanks.

Just curious to know how your pictures look in Picture Viewer? Select actual size and if they come close to filling your screen and look fine I don't know why they wouldn't look ok in Screensaver. If they show in Picture viewer as being small this might be one of the cases where the dimensions are actually small, say 4 by 5, but the resolution is high, say 120 to 300. I think that it is this type of picture that doesn't scale well at all. They would look ok on a tv but why they would look good in iPhoto I don't know.

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