Related pages on www.mikekohn.net: SSE Image Processing, GIF, TIFF, BMP/RLE, JPEG, AVI, kunzip, gif2avi, Ringtone Tools, yuv2rgb

GIF and LZW Compression/Decompression

I originally wrote routines like these for a job, but I wanted to have my own code at home so I rewrote it all from scratch, hopefully writing it better this time :).

So anyway, if you want to see how lzw works, you can download the test source code here. This sample program will simply decompress a GIF and save it as a 24 bit bitmap called debug.bmp and then recompress it into a GIF picture called debug.gif. I started shaping this code so it would fit into a flexible, easy to use library (DLL or .so), I'll probably be posting it soon when I have a chance to polish it up. I also started translating the code to C# for fun. I'll post that too when it's ready. I'll probably also do a Java version so I can benchmark the speed of C# vs. Java.

For a partial explanation of LZW click here.

gif_crop, gif2ascii, gif2html

I included 3 sample programs that use libkohn_gif. One will crop gifs, another will turn a gif into ascii art, and the third will turn the gif into an html table.

An example of an image run through the gif2html can be seen here:

Original GIF Output HTML Image

NOTE: I'm working on documentation for libkohn_gif. I'll post it as soon as I have time. The final release of libkohn_gif will be under LGPL.

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