This Recommendation is applicable to continuous-tone, greyscale or colour, digital still-image data. According to the principles of ITU-T Rec. T.80, it enhances T.81 technologies by providing an additional arithmetic coder.
ITU-T T.851 FRENCH-2005 history
2005ITU-T T.851 FRENCH-2005 ITU-T T.81 (JPEG-1)-based still-image coding using an alternative arithmetic coder