TIFF Group 4 (G4) File Format
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TIFF Group 4 is a protocol used for sending fax documents through an ISDN line. In this group scan lines are encoded with reference to the previous one, creating better compression ratios.

TIFF Group 4 2D - encoding is more than Group 3 encoding. Each scan line is compared to the scan line before it. High levels of compression can be used based on vertical attributes of the image.

TIFF Group 4 support is included in the following Black Ice printer drivers: