Table 3.8 (Continued)

Reference viewing conditions
		Reference background	For the background as part of display screen, the background is 20 % of the reference display luminance level (32 cd/m2), the chromaticity should average to x = 0.3127, y = 0.3290 (D65).
		Reference surround	20 % diffuse reflectance of the maximum reference ambient illuminance level (4.07 cd/m2); the chromaticity should average to x = 0.3457, y = 0.3585 (D50).
		Reference proximal field	20 % reference luminance level of display monitor (16 cd/m2); chromaticity coordinates are about x = 0.3127, y = 0.3290 (D65).
		Reference proximal field	20 % of the reference display luminance level (32 cd/m2); the chromaticity should average to x = 0.3127, y = 0.3290 (D65).
		Reference ambient illuminance level	64 lx
		Reference ambient white point	x = 0.3457, y = 0.3585 (D50).
Transformation from opRGB values to CIE 1931 XYZ values
Transformation from CIE 1931 XYZ values to opRGB values	For 8 bit/channel encoding: For other N bit/channel (N > 8) encoding:
Transformation from opRGB values to YCC values for image compression	For N bit/channel encoding ( and ):

Table 3.8 (End)

Transformation from YCC for image compression values to opRGB values	For 8 bit/channel encoding : For other N-bit/channel encoding (N > 8): In op RGB encoding process, negative opRGB tristimulus values and opRGB greater than 1.00 are not retained by simple clipping. For 8 bit/channel encoding (the resulting values shall be limited to a range from 0 to 255): For other N bit/channel (N > 8) encoding (the resulting values shall be limited to a range from 0 to ):

3.7 Digital video coding system colorimetric characteristics referred toMpeg-2, mpeg-4, mpeg-4/avc

Digital video coding system colorimetric characteristics specified in MPEG-2 – H.262 | 13818-2 3.15, 3.16, MPEG-4 – 14496-2 3.17, 3.18, H.264 | MPEG-4/AVC – 14496-10 3.19 are shown in the Tables 3.9, 3.10, 3.11, which combine according data from Tables 6-7, 6-8, 6-9 from standard 13818-2, Tables 6-8, 6-9, 6-10 from standard 14496-2 and Tables E-2, E-3, E-4 from standard 14496-10.

Primaries chromaticity coordinates and reference white for given parameter values of color_primaries are shown it Table 3.9.

Opto-electronic conversion characteristics – transfer primaries channels characteristics for given parameter values of transfer_characteristics are shown in Table 3.10. Table specifies:

– relative luminance levels – image components;

V– relative levels of gamma-corrected signals – image components ( );

– normalized luminance signal, ;

, – color-difference signals normalized to .

Luminance signals and color-difference signals matrixes coefficients for given parameter values of transfer_characteristics are shown in Table 3.11. For maintaining form of coefficient definitions, accepted in standards, matrixes coefficients of ITU-T H.262 | ISO/IEC 13818-2 and ISO/IEC 14496-2 standards are given in 3 column; matrixes coefficients of ITU-T H.264 | ISO/IEC 14496-10 standard are given in 4 column through K_R and K_B, used for matrix conversion description as following:

(3.154)

(3.155)

(3.156)

with exception of cases when transfer_characteristics values are equal to 0 and 8.

Value 8 in ITU-T H.262 | ISO/IEC 13818-2, ISO/IEC 14496-2 and ITU-T H.264 | ISO/IEC 14496-10 accords to signal coding , processed by algorithms specified in these standards, where signals are in terms of .

Value 0 in ITU-T H.264 | ISO/IEC 14496-10 accords to coding space signals coding processed by algorithms specified in Annex E.2 of standard ITU-T H.264 | ISO/IEC 14496-10.

TABLE 3.9 Digital video coding system colour primaries referred to MPEG-2, MPEG-4, MPEG-4/AVC

color_primaries	Systems and standards	Primaries and reference white chromaticity coordinates
0	Forbidden (ISO/IEC 13818-2 and ISO/IEC 14486-2)
	Reserved (ISO/IEC 14486-10)	For future use ITU-T/ISO/IEC
1	Recommendation ITU-R BT.709-5 [3.6] Recommendation INTO-R BT.1361 [3.9], conventional color gamut system and extended color gamut system IEC 61966-2-4 [3.13] SMPTE 170M [3/2] (functionally the same as the value)
						x	y
				Red		0.640	0.330
				Green		0.300	0.600
				Blue		0.150	0.060
				White D65		0.3127	0.3290
2	Unspecified	Image characteristics are unknown or are determined by the application
3	Reserved	For future use by ITU-T | ISO/IEC
4	ITU-R Recommendation BT.470-6 system M (historically) ITU-R Recommendation BT.1700 [3.3], 625 PAL or 625 SECAM (ISO/IEC 14486-10) NTSC 1953 Recommendation for transmission standards for color television US FCC Title 47 Code of Federal Regulations (2004) 73.682 (a) (20)
						x	y
				Red		0.67	0.33
				Green		0.21	0.71
				Blue		0.14	0.08
				White C		0.310	0.316
5	ITU-R Recommendation BT.1700 [3.3] 625 PAL or 625 SECAM ITU-R Recommendation BT.1358 [3.5] 625 ITU-R Recommendation BT.601-6 [3.4] 625 (ISO/IEC 13818-2 and 14486-2) ITU-R Recommendation BT.470-6 systems B, G (historically)
						x	y
					Red	0.64	0.33
					Green	0.29	0.60
					Blue	0.15	0.06
					White D65	0.3127	0.3290