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 ITU‑T T.800 and the fifth edition of ISO/IEC 15444-1.