Some pictures in slideshow are pixilated

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I'm making a slideshow in Aperture (3.2.2) on my iMac (3.4 GHz Intel Core i7, Memory 16 GB 1333 MHz DDR3) running Mac OS X 10.6.8, and some of the photos that were transferred from a CD-ROM, and some that were recently transferred from an SD card are pixilated!  I've done many slideshows before, and have never experienced this.  The File size of the image doesn't matter.  Some of the larger megapixel images are very pixilated, while some of the very small images (356 K) are not.
It's also happening in iPhoto.  Also, when I move a photo from Aperture to iPhoto, the file size is reduced dramatically.  Why does this happen?
I am hoping that someone out there has a simple solution for this!  Time is of the essence!
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Stan,
This completely seems like a case of not having enough resolution in your pictures for the purpose at hand.
It's possible that the slideshow is stretching some of the photos and not others.  If I remember right, portrait photos in a slideshow will be letterboxed, with black on either side of the photo so you can see all (or the majority) of your photo on the screen.  A photo of the same size, but landscape orientation, will take up the whole screen.  Thus, the portrait photo will be shrunk, or alternately (depending on the sizes we're talking about), the landscape will be blown up.  Any time you blow up a digital photo, it wil be pixelated.  That's the only thing I can think of in terms of your landscape versus portrait.
Your photos are very, very small.  It sounds like they are actually thumbnails, or from a very early digital camera when photos that matched the pixel dimensions of the monitor were ok.  Your monitor is probably 1.2-1.5 megapixels, so any photo smaller than that runs the chance of not having enough detail to look good.
As for the 0.8 MP and 0.7 MP comparison in your email, I'm guessing that you are talking about JPEGs.  JPEG is a lossy format, and when the file is created, the creator of the file determines how much information to throw away.  It's possible that there was too much information thrown away (maybe to get to a certain file size) to recreate a good-looking photo.
One thing to try -- open one of the bad-looking photos in Preview and look at it with 1-1 zoom.  That will show you how large the photo really could look on your monitor without being "blown up."
nathan

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