 white C 0.310 0.316 9..255 Reserved For future use by ITU-T ISO/IEC transfer_characteristics indicates the opto-electronic transfer characteristic of the source picture as specified in Table E-4 as a function of a linear optical intensity input Lc with a nominal real-valued range of 0 to 1. When the transfer_characteristics syntax element is not present, the value of transfer characteristics shall be inferred to be equal to 2 (the transfer characteristics are unspecified or are determined by the application). Rec. ITU-T H.264 (01/2012) Table E-4 - Transfer characteristics Value Transfer Characteristic Informative Remark Reserved For future use by ITU-T ISO/IEC V = 1.099 * 0.45 - 0.099 for >= Lc >= 0.018 ITU-R Rec. BT.709-5 V = 4.500 * Lc for 0.018 > Lc >= 0 ITU-R Rec. BT.1361 conventional colour gamut system (functionally the same as the value 6) Unspecified Image characteristics are unknown or are determined by the application. Reserved For future use by ITU-T ISO/IEC Assumed display gamma 2.2 ITU-R Rec. BT.470-6 System M (historical) United States National Television System Committee 1953 Recommendation for transmission standards for colour television United States Federal Communications Commission Title 47 Code of Federal Regulations (2003) 73.682 (a) (20) ITU-R Rec. BT.1700 (2007 revision) 625 PAL and 625 SECAM Assumed display gamma 2.8 ITU-R Rec. BT.470-6 System B, G (historical) V = 1.099 * L 0.45 - 0.099 for 1 >= Lc >= 0.018 ITU-R Rec. BT.601-6 525 or 625 V = 4.500 * Lc for 0.018 > Lc >= 0 ITU-R Rec. BT.1358 525 or 625 ITU-R Rec. BT.1700 NTSC Society of Motion Picture and Television Engineers 170M (2004) (functionally the same as the value 1) V = 1.1115*L.0.45-0.1115 for >= Lc >= 0.0228 Society of Motion Picture and Television Engineers 240M (1999) V =4.0*Lc for 0.0228 > L >= 0 for 1> Lc >= 0 Linear transfer characteristics V = 1.0 + Log10(Lc) 2 for >= Lc >= 0.01 Logarithmic transfer characteristic V 0.0 for 0.01 > Lc>= 0 (100:1 range) V = 1.0 + Log10(Lc) 2.5 for 1 >= Lc Sqrt( 10 / 1000 Logarithmic transf