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I've been working with digital images for years now, and those artifacts are a pain to get rid of. The more you compress the image, the worse they look. A few things I have tried with relative success....
Add noise to the images. Maybe 1-3 %. I use Paint Shop Pro to do it on bad images, don't know how to do it in Photoshop.
Save your pictures at a higher quality. I usually save mine at quality of 12 in Photoshop, then tinker with them in Macromedia Fireworks at different compressions.
Adjust the bit rate of your video card. I use 16 bit as I WANT to see jpeg artifacts. If I can get the pictures decent in 16 bit, I know they will be great in 24. I have seen bad jpeg artifacts in 16 bit, and they disappear in 24 bit color.
Also, go to Google and do a search on JPEG artifacts. I remember a few years ago a filter (or program) that adjusts certain colors so the artifacts are less noticable. I think only a certain hue or something causes them.
I also noticed that jpeg artifacts are terrible with digital images. Images scanned from slides seem to have little, if any JPEG artifacts.
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