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IMAGING GLOSSARY

GIF (file format extension)

Name: Graphics Interchange File Format Format originator: CompuServe Inc. 500 Arlington Center Blvd. Columbus, OH 43220

This format uses the LZW compression created by Unisys (requires special licensing).

It is the same as the LZW compression used in the TIFF file format, except that the bytes are reversed and the string table is upside-down.

All GIF files have a palette. Some GIF files can be interlaced - the raster lines can appear as every 4 lines, then every 8 lines, then every other line. This is due to GIF files usually being received from a modem.

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