The GIF format was initially developed by the UNISYS Corporation and
was one of first compression formats that made image transfer on the Internet possible.aStandard prediction techniques such as DPCM or its variants modified to 2D can be used to predict pixel values in the neighborhood.
• The errors between the actual values and their predictions can then be entropy coded to achieve compression.
• The lossless mode of JPEG works by using a predictive scheme that exploits redundancy in two dimensions.