vBulletin.org has a sig limit of 300x125 pixels and 20K. Rather than just scale my sig down, I decided to change it to fit their limit. In the end I came down to 5 bytes over 20K, so I hacked the 5 bytes off the end . I'm sure those bytes were important, but I can't tell the difference. In any case, the results of the file size limits are a 299x123 sig with 63 colors, 23 or so frames and 5 bytes hacked off the end: