CCITT Definition

CCITT which stands for Comité Consultatif International Téléphonique et Télégraphique is a lossless compression format that is historically used for compressing two color images like black and white. The few types of versions of this format are commonly known as Group 3 which encodes every line separately and Group 4 which makes references from the previous lines.

Being used for TIFF compression the format leverages the technique typically referred to as Huffman encoding with its purpose being to allow the data to be confined into a significantly smaller compressed stream. This method proves to be most useful for compressing images that contain long and repeated pixels of single colours.