D.2.24 Tone mapping information SEI message semantics This SEI message provides information to enable remapping of the colour samples of the output decoded pictures for customization to particular display environments. The remapping process maps coded sample values in the RGB colour space (specified in Annex E) to target sample values. All mappings are expressed in the RGB colour space and should be applied to each RGB component separately. tone_map_id contains an identifying number that may be used to identify the purpose of the tone mapping model. The value of tone_map_id shall be in the range of 0 to 232 - 2, inclusive. Values of tone_map_id from 0 to 255 and from 512 to 231 - 1 may be used as determined by the application. Values of tone_map_id from 256 to 511 and from 231 to 232 - 2 are reserved for future use by ITU-T ISO/IEC. Decoders shall ignore (remove from the bitstream and discard) all tone mapping information SEI messages containing a value of tone_map_id in the range of 256 to 511 or in the range of 231 to 232 2, and bitstreams shall not contain such values. NOTE 1 - The tone_map_id can be used to support tone mapping operations that are suitable for different display scenarios. For example, different values of tone_map_id may correspond to different display bit depths. tone_map_cancel_flag equal to 1 indicates that the tone mapping information SEI message cancels the persistence of any previous tone mapping information SEI message in output order. tone_map_cancel_flag equal to 0 indicates that tone mapping information follows. Rec. ITU-T H.264 (01/2012) tone_map_repetition_period specifies the persistence of the tone mapping information SEI message and may specify a picture order count interval within which another tone mapping information SEI message with the same value of tone_map_id or the end of the coded video sequence shall be present in the bitstream. The value of tone_map_repetition_periods shall be in the range of 0 to 6 384, inclusive. tone_map_repetition_period equal to 0 specifies that 