LINK from TosaInu's sig.Pictures
Pictures in signatures are not the occasional used pictures to illustrate something, but show up in every topic. It's already possible that one page contains 25 different 4.5 kb avatars. Users with slow modems will experience serious trouble when loading pages with many (larger) graphics.
Pictures are limited:
-10,240 bytes max.
-no sound.
-max 500 pixels wide, max 150 pixels high. This applies to all images together in the signature.
This doesn't apply to occasionaly used pictures in posts, though one should keep in mind that 56k modem users should be able to download it within a reasonable time.
Scrolling topics containing high signatures is considered difficult, so they are limited there too. A signature can be 10 lines high, 500 characters long, 200 pixels high or what limit is reached first.
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