Group 3 CompressionGroup 3 compression is a method for compressing monochrome bitmaps that is used by fax machines, and is also available as on of the compression options in TIFF file format.
Group 3 compression is defined in the CCITT T.4 standard, and is thus often known as a type of CCITT compression.
Group 3 compression works by encoding each scanline in the bitmap with a series of variable length codes to represent sequences of black and white pixels (the code idea is somewhat similar to Huffman compression, except the codes are predefined for Group 3).
A technical discussion of Group 3 compression can be found in Chapter 6 of Graphics File Formats† by David C. Kay and John R. Levine.
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