Regarding compression, I typically use photoshop... I'm not really a graphics person, but can get around the block when I need to...
Is there a special way to save with greater compression in photoshop 7.0. Typically, I'll 'save for web', this shows me the file sizes when I'm choosing the format and number of colors when saved.
Most picture editing software should give you an option of "no compression" or "LZW compression" (or words to that effect) for GIF image files. I don't know of other compression methods available for GIF files, but there might be others. Some editors don't do the compression, because for a long time LZW was patented (Unisys) and most authors refused to either pay the licensing fee or break the law. Most recent levels of picture editors should permit compression, and may even do it by default since the patent expired.
Debabelizer, as I understand it, is a program that strips out tons of extra background information that's also saved with an image. Typically, an image is not just 0's and 1's representing pixels, but much more info too. (not an expert here, so if you are, please give my explanation a wide berth). Most of this background information is unneeded.
I've seen some programs that allow you to remove alot of this garbage, and scene the results where you can keep picture quality, but lower image size by up to 80%.
Wow, 80% is quite good! Are you sure this is specific to GIF files? I didn't know there was that much garbage in these files -- makes you wonder why it's there if it has no effect. If they really
are compressing GIF files by 80 or 90%, I suspect that they're doing some subtle tricks to reduce the number of colors, which leads to better compression (at the cost of poorer picture quality). They may also be stripping out "useless" stuff like copyright notices! Of course, they're comparing it to a raw, uncompressed file.
I'd even search for these types of programs, but I"m not exactly sure of the search phrases to look for...
GIF, compression, LZW