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For each 8-bit luminance sample, the nominal value to represent black is 16, and the value for white is 235. Eight-bit code values from 1 through 15 provide footroom and can be used to accommodate transient signal content such as filter undershoots. Similarly, code values 236 through 254 provide
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At an ITU meeting in autumn 1981, CCIR Study Group 11 approved document 11/1027 describing the parameter values for a unified digital video format. This was adopted as Draft Rec. AA/11 "Encoding
Parameters for Digital Television for Studios" by the CCIR Plenary Assembly in February 1982, later
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The key feature allowing a globally accepted digital standard were the use of component coding and choosing a luminance sampling frequency that was a common multiple of the line frequencies used in analog standards. This "orthogonal" sampling approach originated from
Stanley Baron of NBC.
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signal, and thus the sampling includes data for the horizontal and vertical sync and blanking intervals. Regardless of the frame rate, the luminance sampling frequency is 13.5 MHz. The samples are uniformly
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Preparation preceded the CCIR approval, including laboratory testing around the world to validate the proposed parameter values. International negotiations and efforts to build consensus were led by figures like
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In the early 1980s, digital television equipment was beginning to emerge, but each manufacturer was developing their own proprietary digital versions of existing analog standards like
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The standard has been revised several times in its history. Its seventh edition, referred to as BT.601-7, was approved in March 2011 and was formally published in
October 2011.
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primaries) systems. Earlier versions of the standard (prior to BT.601-6, approved in
January 2007) did not contain an explicit definition of the color primaries.
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Rec. ITU-R BT.601 25th
Anniversary and still "in force" – the bridge that joined the analogue and digital worlds (1982–2007)
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and use the value 128 to encode the neutral color difference value, as used when encoding a white, grey or black area.
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The Rec. 601 video raster format has been re-used in a number of later standards, including the ISO/IEC
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headroom and can be used to accommodate transient signal content such as
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and 625-line 50 Hz signals, both with an active region covering 720
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For the vision capacities of organisms or machines, see
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64:Learn how and when to remove these messages
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53:or discuss these issues on the
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452:encoding system is known as
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578:BT.601 625-line color cube
567:BT.601 525-line color cube
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751:Transfer characteristics
368:Digital image processing
262:diagram, with 625-line (
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559:Primary chromaticities
482:Background and history
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1044:List of color spaces
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516:Richard Green
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116: –
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110:Find sources:
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88:single source
84:This article
82:
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1541:Color vision
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1049:Color models
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976:. Retrieved
972:
941:
921:ITU-R BT.656
876:
754:
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631:
595:NTSC SMPTE C
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485:
477:
458:
430:analog video
414:
410:
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272:NTSC SMPTE C
260:chromaticity
230:
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152:
142:
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121:
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85:
61:
54:
48:
47:Please help
44:
1576:Color space
1519: [
1474:ICC profile
1033:Color space
973:www.itu.int
768:gamma curve
612:White point
607:Color space
446:chrominance
432:signals in
1555:Categories
1364:Hexachrome
1173:Wide-gamut
1115:UVW (1964)
1110:YUV (1960)
1105:RGB (1931)
1100:XYZ (1931)
933:References
726:525 lines
697:625 lines
463:and ITU-T
427:interlaced
318:2011-03-08
190:improve it
125:newspapers
114:"Rec. 601"
50:improve it
1516:JIS Z8102
1299:Rec. 2100
1287:Rec. 2100
1282:Rec. 2020
1213:Rec. 2100
1208:Rec. 2020
911:Rec. 2020
847:≥
836:−
772:luminance
762:which is
757:nonlinear
533:quantized
442:luminance
387:/R-REC-BT
258:Rec. 601
206:June 2023
194:verifying
155:June 2023
95:talk page
56:talk page
1479:ISCC–NBS
1369:HSL, HSV
1354:Coloroid
1349:ColorADD
1277:Rec. 709
1272:Rec. 601
1203:Rec. 709
1193:Rec. 601
1178:ProPhoto
1135:CIECAM16
1130:CIECAM02
1082:CIECAM16
1067:CIECAM02
978:10 March
901:Rec. 709
885:See also
553:unsigned
543:domain.
356:, ITU-T
352:ISO/IEC
309:BT.601-7
283:Approved
247:Rec. 601
1499:Pantone
1494:Ostwald
1484:Munsell
1389:OSA-UCS
917:(UHDTV)
774:range:
703:0.3290
374:Website
326:Authors
316: (
296: (
188:Please
139:scholar
1539:
1339:CcMmYK
1188:DCI-P3
949:. ITU.
907:(HDTV)
873:Awards
850:0.018.
764:linear
744:0.070
738:0.595
732:0.340
721:0.060
715:0.600
709:0.330
700:0.3127
494:, and
411:BT.601
364:Domain
280:Status
141:
134:
127:
120:
112:
18:BT.601
1523:]
1384:Oklab
1332:Other
1323:YCoCg
1318:xvYCC
1306:YPbPr
1294:ICtCp
1267:YCbCr
1248:SECAM
1243:YDbDr
1183:scRGB
1168:Adobe
1077:CAM16
896:YCbCr
839:0.099
823:1.099
813:0.018
799:4.500
741:0.155
735:0.310
729:0.630
718:0.150
712:0.290
706:0.640
591:SECAM
541:YCbCr
492:SECAM
473:4:2:0
465:H.26x
450:color
401:ITU-R
358:H.26x
330:ITU-R
268:SECAM
146:JSTOR
132:books
1509:list
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