ITU-T Recommendations

This Recommendation | International Standard defines a set of lossless (bit-preserving) and lossy compression methods for coding bi-level, continuous-tone grey-scale, palletized colour, or continuous-tone colour digital still images.
This Recommendation | International Standard:
–specifies decoding processes for converting compressed image data to reconstructed image data;
–specifies a codestream syntax containing information for interpreting the compressed image data;
–specifies a file format;
–provides guidance on encoding processes for converting source image data to compressed image data;
–provides guidance on how to implement these processes in practice.
This edition includes the following changes relative to the previous edition:
–addition of Annex N, which lists a registration request for media type image/j2c
–specify that the Mastering Display Metadata Box of Annex M is optional and has no defaults, reflecting industry practice
–remove obsolete and erroneous reference to IETF RFC 2279
–clarify semantics of CEpoci
–update reference to ISO/CIE 11664-1, Rec. ITU-R BT.601 and Rec. ITU-R BT.709
–remove unused JPEG Utilities Registration Authority (JURA) term
–specify the value of Rsiz when extended capabilities are present but no profile is signalled

NOTE – As this specification was first published as common text only after ISO/IEC JTC1 had approved the first edition in 2000, edition numbers in the ITU and ISO/IEC versions are offset by one. This is the fourth edition of ITUT T.800 and the fifth edition of ISO/IEC 15444-1.