The GIF89a image file format allows you to specify that one colour in the image will be treated as transparent by a web browser. Giftrans is a tool that will enable you to create such transparent GIFs.
mv giftrans.exe giftransand make sure that the program file giftrans is executable:
chmod u+x giftrans
giftrans -t #ffffff file.gif > transparentfile.gif
If the above command-line program is too esoteric for you, then you might like to consider the following tools:
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Last Modified: Thursday, 20-Mar-1997 18:01:05 GMT