LZW compression algorithm for GIFs...

I am trying to write a function that will save an image as a GIF, and I understand all the other portions of the GIF format, but I cannot find a document that does a good job covering how the GIF format uses LZW. Even the official specs from CompuServe left out a lot of vital information. Can anybody tell me how it works or point me to a place that explains it?

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