CCITT Group 3 and 4 (FAX)
You can compress bitonal images using the CCITT Group 3 (FAX one-dimensional coding scheme) and decompress CCITT Group 3 and 4 bitonal images. FAX is the more common name for the CCITT Group 3 and Group 4 standard for document transmission; however, most FAX machines support only Group 3 format. FAX is a lossless method.
CCITT provides good compression for scanned documents, where plentiful white space exists and decompresses in a reasonable amount of time. CCITT compression of photographic images is less effective.