TIFF Group 3 (G3) File Format
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TIFF Group 3 is the universal protocol for sending fax documents through a phone line. In this group each scan line is encoded independently.

TIFF Group 3 1D - a scan line is encoded as a set of runs, each representing a number of white or black pixels, with white and black runs alrenating. Every run is encoded using a different number of bits, which can be uniquely identified when decoded. Reoccurring lengths of runs will be encoded efficiently, while infrequent runs cause the size to grow.

TIFF Group 3 2D - G3 2-D is a combination of G3 1-D and G4 compression schemes.

TIFF Group 3 (G3) support is included in the following Black Ice printer drivers:

• Monochrome TIFF Printer Drivers
• Color Printer Drivers
• ColorPlus PDF Printer Drivers