Scary problem! Old photos suddenly dark, low resolution.

Going through some old pictures I've just noticed that 3-4 sets from 4 years ago have become very dark and lower resolution.
The weirdest part is that they are not complete "sets" -- that is, the darkness seems to in random groups of certain sets (i.e., the first 3-4 are okay, followed by 20 dark/low rez images, followed by 2-3 'normal' images).
I tried zapping the PRAM, as I read that resolved a similar issue. And I repaired permissions.
No dice.
Any thoughts? What I'm afraid of is this happening to all my photos.
Note that I upgraded from a 12" G4 to an iMac two years ago, and imported all those photos. I also upgraded to 10.6 about 8 months ago.
But I just noticed this now -- not sure when it happened.
HELP!

Old Toad wrote:
Have you calibrated your screen. Check to see what the gamma is set to in the custom calibration mode. It used to be 1.8 but was changed to 2.2 a while back with Leopard or Snow Leopard. So it could be any number of events that changed them . Have you tried deleting the iPhoto preference file, com.apple.iPhoto.plist, that resides in your User/Library/Preferences folder?
Have you calibrated your screen. Check to see what the gamma is set to in the custom calibration mode. It used to be 1.8 but was changed to 2.2 a while back with Leopard or Snow Leopard. So it could be any number of events that changed them . Have you tried deleting the iPhoto preference file, com.apple.iPhoto.plist, that resides in your User/Library/Preferences folder?
Thanks much for the tips. I calibrated per your suggestion and killed the pref file -- still have several batches of very dark, low resolution photos that weren't that way before.
Weird.

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