Photos grainy

I uploaded pictures from my Canon camera and all the pictures looked really sharp. This morning when I looked at them again, after I've deleted some, every picture was grainy after I opened them. Any advise?

Dear All,
I've worked out a diagnosis and a solution.
Please note that my Mac-based photo library is managed through Aperature. Thus, I don't know how applicable what I have to say is to those who use iPhoto.
It appears that iTunes grabs the preview files for all photos you have selected to import to the iPhone. In Aperature, there is a setting to limit the preview sizes. The default option is 'half size', which is fine for multi-megapixel images (a 4 MP image becomes a 2MP image, which iTunes then further optimizes [shrinks] for the iPhone). However, if you have smaller images (think webclips), then you get mini images and the quality becomes unbearable.
Thus, go into the Preferences for Aperature, and change the preview settings (mine is set to 'unlimited'). Then, select all photos in Aperature (or selected albums) and hold down Option while you right-click and select 'delete previews'.
Then, go into iTunes, and after having removed all photos from the iphone, reselect the albums you wish to copy back to the iphone and sync.
Itunes/aperature will rebuild all of the previews, but to a large® size. This solved my problem. Anyone else get any success?
Cheers all,
Seegem

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Dear ATR,
I apologize for my late response. I was on holiday
A.T. Romano schreef:
Question...Your camera is a miniDV camcorder....what did you capture from it and into what....
Did you do a DV data capture firewire into Premiere Elements Capture Window to get DV.avi Widescreen (any mention of Type 1 or Type 2)
or
Did you do HDV data capture firewire into Premiere Elements Capture Window to get HDV (MPEG2.mpg)
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Still resized - 1920 x 1080?
DVD-VIDEO screen capture of video? - 720 x 576 16:9 which would display after encoding about 1054 x 576
MP4 - ?
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The second is a capture from the DVD file (which was burned to a folder)
The third is a capture from a created MP4 video file
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