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xvYCC

xvYCC or extended-gamut YCbCr is a color space that can be used in the video electronics of television sets to support a gamut 1.8 times as large as that of the sRGB color space. xvYCC was proposed by Sony, specified by the IEC in October 2005 and published in January 2006 as IEC 61966-2-4. Its predecessor, Kodak Photo CD uses the same OETF as xvYCC.

Sony's x.v.Color logo

xvYCC-encoded video retains the same color primaries and white point as BT.709, and uses either a BT.601 or BT.709 RGB-to-YCC conversion matrix and encoding. This allows it to travel through existing digital limited range YCC data paths, and any colors within the normal gamut will be compatible. It works by allowing negative RGB inputs and expanding the output chroma. These are used to encode more saturated colors by using a greater part of the RGB values that can be encoded in the YCbCr signal compared with those used in Broadcast Safe Level. The extra-gamut colors can then be displayed by a device whose underlying technology is not limited by the standard primaries.

In a paper published by Society for Information Display in 2006, the authors mapped the 769 colors in the Munsell Color Cascade (so called Michael Pointer's gamut) to the BT.709 space and to the xvYCC space. About 55% of the Munsell colors could be mapped to the sRGB gamut, but 100% of those colors map to within the xvYCC gamut. Deeper hues can be created – for example a deeper cyan by giving the opposing primary (red) a negative coefficient. The quantization range of the xvYCC601 and xvYCC709 colorimetries is always Limited Range.

Contents

xvYCC was motivated by the fact that modern display and capture technologies often have underlying RGB primaries with significantly higher saturation than the traditional CRT displays (serving as the basis of sRGB and Rec. 709), allowing them to handle a wider color gamut. But these devices have been unable to do this without upsetting basic calibration, as all existing video storage and transmission systems are based on CRT primaries, and are hence limited to the CRT gamut.

xvYCC expands the chroma values to 1-254 while keeping the luma (Y) value range at 16-235 (though Superwhite may be supported), the same as Rec. 709. First the OETF (TransferCharacteristics 11 per H.273 as originally specified by first amendment to H.264) is expanded to allow negative RGB inputs such that:

V = { 1.099 ( L ) 0.45 + 0.099 L 0.018 4.500 L 0.018 < L < 0.018 1.099 L 0.45 0.099 L 0.018 {\displaystyle V={\begin{cases}-1.099(-L)^{0.45}+0.099&L\leq -0.018\\4.500L&-0.018<L<0.018\\1.099L^{0.45}-0.099&L\geq 0.018\end{cases}}}

Here 1.099 number has the value 1 + 5.5 * β = 1.099296826809442... and β has the value 0.018053968510807..., while 0.099 is 1.099 - 1.

The YCC encoding matrix is unchanged, and can follow either Rec. 709 or Rec. 601 (MatrixCoefficients 1 and 5).

The possible range for non-linear R’G’B’601 is between -1.0732 and 2.0835 and for R’G’B’709 is between -1.1206 and 2.1305. That is achieved when YCC values are "1, 1, any" and "254, 254, any" in B' component.

xvYCC709 covers 37.19% of CIE 1976 u'v', while BT.709 only 33.24%.

The last step encodes the values to a binary number (quantization). It is basically unchanged, except that a bit-depth n of more than 8 bits can be selected:

Y x v n = 2 n 8 ( 219 × Y + 16 ) C b x v n = 2 n 8 ( 224 × C b + 128 ) C r x v n = 2 n 8 ( 224 × C r + 128 ) {\displaystyle {\begin{aligned}Y_{{\rm {xv}}\ n}&=\left\lfloor 2^{n-8}(219\times Y+16)\right\rceil \\Cb_{{\rm {xv}}\ n}&=\left\lfloor 2^{n-8}(224\times Cb+128)\right\rceil \\Cr_{{\rm {xv}}\ n}&=\left\lfloor 2^{n-8}(224\times Cr+128)\right\rceil \\\end{aligned}}}

Example

With negative primary amounts allowed, a cyan that lies outside the basic gamut of the primaries can be encoded as "green plus blue minus red". Since the 16-255 Y range is used (255 value is reserved in HDMI standard for synchronization but may be in files) and since the values of Cb and Cr are only little restricted, a lot of high saturated colors outside the 0–255 RGB space can be encoded. For example, if YCbCr is 255, 128, 128, in the case of a full level YCbCr encoding (0–255), then the corresponding R'G'B' is 255, 255, 255 which is the maximum encodable luminance value in this color space. But if Y=255 and Cr and/or Cb are not 128, this codes for the maximum luminance but with an added color: one primary must necessarily be above 255 and cannot be converted to R'G'B'. Adapted software and hardware must be used during production to not clip the video data levels that are above the sRGB space. This is almost never the case for software working with an RGB core.

The more complex example is YCbCr BT.709 values 139, 151, 24 (that is RGB -21, 182, 181). That is out-of-gamut for BT.709, but is not for sYCC and xvYCC709, and to convert those values to display gamut you would convert to XYZ (0.27018, 0.40327, 0.54109) and then to display gamut.

The XYZ matrix is as specified in Nvidia docs.

A mechanism for signaling xvYCC support and transmitting the gamut boundary definition for xvYCC has been defined in the HDMI 1.3 Specification. No new mechanism is required for transmitting the xvYCC data itself, as it is compatible with HDMI's existing YCbCr formats, but the display needs to signal its readiness to accept the extra-gamut xvYCC values (in Colorimetry block of EDID, flags xvYCC709 and xvYCC601), and the source needs to signal the actual gamut in use in AVI InfoFrame and use gamut metadata packets to help the display to intelligently adapt extreme colors to its own gamut limitations.

This should not be confused with HDMI 1.3's other new color feature, deep color. This is a separate feature that increases the precision of brightness and color information, and is independent of xvYCC.

xvYCC is not supported by DVD-Video but is supported by the high-definition recording format AVCHD and PlayStation 3 and Blu-ray. It is also supported by some cameras, like Sony HDR-CX405, that does actually tag the video as xvYCC with BT.709 inside Sony's XAVC.

On January 7, 2013, Sony announced that it would release "Mastered in 4K" Blu-ray Disc titles which are sourced at 4K and encoded at 1080p. "Mastered in 4K" 1080p Blu-ray Disc titles can be played on existing Blu-ray Disc players and will support a larger color space using xvYCC.

On May 30, 2013, Eye IO announced that their encoding technology was licensed by Sony Pictures Entertainment to deliver 4K Ultra HD video with their "Sony 4K Video Unlimited Service". Eye IO encodes their video assets at 3840 x 2160 and includes support for the xvYCC color space.

The following graphics hardware support xvYCC color space when connected to a display device supporting xvYCC:

  • AMD Mobility Radeon HD 4000 series and newer models
  • AMD Radeon HD 5000 series and newer models
  • AMD 785G, 880G and 890GX chipsets with integrated graphics
  • Intel HD Graphics integrated on some CPUs (except Pentium G6950 and Celeron G1101)
  • nVidia GeForce 200 series and newer models
  1. "HDMI 1.3 Update"(PDF). HDMI Licensing. 2006. Retrieved2006-08-30.
  2. "新動画用拡張色空間 xvYCC(IEC61966-2-4)"(PDF).
  3. "Color gamuts of Rec709 and xvYCC". res18h39.netlify.app. Retrieved2021-01-29.
  4. "xvYCC". Sony Global. Archived from the original on August 29, 2009. Retrieved2009-08-13.
  5. Tatsuhiko Matsumoto; Yoshihide Shimpuku; Takehiro Nakatsue; Shuichi Haga; Hiroaki Eto; Yoshiyuki Akiyama & Naoya Katoh (2006). 19.2: xvYCC: A New Standard for Video Systems using Extended-Gamut YCC Color Space. SID INTERNATIONAL SYMPOSIUM. Society for Information Display. pp. 1130–1133. doi:10.1889/1.2433175.
  6. "A DTV Profile for Uncompressed High Speed Digital Interfaces (ANSI/CTA-861-H)". Consumer Technology Association®. p. 44. Retrieved2021-03-11.
  7. Naoya Katoh (2007). "New" Extended-gamut Color Space for Video Applications; xvYCC (IEC61966-2-4)(PDF). Hollywood Post Alliance. Archived from the original(PDF) on 2021-03-31. Retrieved2009-08-13.
  8. "H.273: Coding-independent code points for video signal type identification". www.itu.int. Retrieved2020-12-25.
  9. "IEC 61966-2-4:2006 | IEC Webstore". webstore.iec.ch. Retrieved2021-01-29.
  10. Xu Yan; Li Yan; Li Guiling (May 2009). "A kind of nonlinear quantization method to extend the color gamut of DTV system". 2009 IEEE 13th International Symposium on Consumer Electronics: 141–143. doi:10.1109/ISCE.2009.5156953.
  11. "Color Calculator". res18h39.netlify.app. Retrieved25 January 2021.
  12. "NVIDIA 2D Image And Signal Performance Primitives (NPP): RGBToXYZ". docs.nvidia.com. Retrieved2021-01-29.
  13. "XAVC-S: How to export time/date metadata to subtitles (srt)?". www.videohelp.com.
  14. Richard Lawler (2013-01-07). "Sony to launch 4K digital distribution network this summer, 'mastered in 4K' Blu-ray discs". Engadget. Retrieved2013-05-30.
  15. Seamus Byrne (2013-05-01). "Sony 'mastered in 4K' Blu-rays a mixed blessing". CNET. Retrieved2013-05-30.
  16. "What is Mastered in 4K and does it make a difference?". Trusted Reviews. 2014-03-10. Retrieved2020-12-24.
  17. "eyeIO Delivers Unprecedented Viewing Experience for Sony Pictures Content on Sony 4K UltraHD TVs". Eye IO, LLC. 2013-05-30. Retrieved2013-06-05.
  18. Todd Sprangler (2013-05-30). "Sony Gears Up for 4K Ultra HD Internet Movie Service". Variety. Retrieved2013-06-05.

xvYCC
xvYCC Language Watch Edit xvYCC or extended gamut YCbCr is a color space that can be used in the video electronics of television sets to support a gamut 1 8 times as large as that of the sRGB color space 1 2 3 xvYCC was proposed by Sony 4 specified by the IEC in October 2005 and published in January 2006 as IEC 61966 2 4 Its predecessor Kodak Photo CD uses the same OETF as xvYCC Sony s x v Color logo xvYCC encoded video retains the same color primaries and white point as BT 709 and uses either a BT 601 or BT 709 RGB to YCC conversion matrix and encoding 4 This allows it to travel through existing digital limited range YCC data paths and any colors within the normal gamut will be compatible 4 It works by allowing negative RGB inputs and expanding the output chroma These are used to encode more saturated colors by using a greater part of the RGB values that can be encoded in the YCbCr signal compared with those used in Broadcast Safe Level 4 The extra gamut colors can then be displayed by a device whose underlying technology is not limited by the standard primaries 4 In a paper published by Society for Information Display in 2006 the authors mapped the 769 colors in the Munsell Color Cascade so called Michael Pointer s gamut to the BT 709 space and to the xvYCC space About 55 of the Munsell colors could be mapped to the sRGB gamut but 100 of those colors map to within the xvYCC gamut 5 Deeper hues can be created for example a deeper cyan by giving the opposing primary red a negative coefficient The quantization range of the xvYCC601 and xvYCC709 colorimetries is always Limited Range 6 Contents 1 Background 2 Definition 2 1 Example 3 Adoption 4 History 5 Hardware support 6 References 7 External linksBackground EditxvYCC was motivated by the fact that modern display and capture technologies often have underlying RGB primaries with significantly higher saturation than the traditional CRT displays serving as the basis of sRGB and Rec 709 allowing them to handle a wider color gamut But these devices have been unable to do this without upsetting basic calibration as all existing video storage and transmission systems are based on CRT primaries and are hence limited to the CRT gamut 7 Definition EditxvYCC expands the chroma values to 1 254 while keeping the luma Y value range at 16 235 though Superwhite may be supported the same as Rec 709 First the OETF TransferCharacteristics 11 per H 273 8 as originally specified by first amendment to H 264 is expanded to allow negative RGB inputs such that 5 V 1 099 L 0 45 0 099 L 0 018 4 500 L 0 018 lt L lt 0 018 1 099 L 0 45 0 099 L 0 018 displaystyle V begin cases 1 099 L 0 45 0 099 amp L leq 0 018 4 500L amp 0 018 lt L lt 0 018 1 099L 0 45 0 099 amp L geq 0 018 end cases Here 1 099 number has the value 1 5 5 b 1 099296826809442 and b has the value 0 018053968510807 while 0 099 is 1 099 1 8 The YCC encoding matrix is unchanged and can follow either Rec 709 or Rec 601 MatrixCoefficients 1 and 5 5 The possible range for non linear R G B 601 is between 1 0732 and 2 0835 and for R G B 709 is between 1 1206 and 2 1305 9 That is achieved when YCC values are 1 1 any and 254 254 any in B component xvYCC709 covers 37 19 of CIE 1976 u v while BT 709 only 33 24 10 The last step encodes the values to a binary number quantization It is basically unchanged except that a bit depth n of more than 8 bits can be selected 5 Y x v n 2 n 8 219 Y 16 C b x v n 2 n 8 224 C b 128 C r x v n 2 n 8 224 C r 128 displaystyle begin aligned Y rm xv n amp left lfloor 2 n 8 219 times Y 16 right rceil Cb rm xv n amp left lfloor 2 n 8 224 times Cb 128 right rceil Cr rm xv n amp left lfloor 2 n 8 224 times Cr 128 right rceil end aligned Example Edit With negative primary amounts allowed a cyan that lies outside the basic gamut of the primaries can be encoded as green plus blue minus red 4 Since the 16 255 Y range is used 255 value is reserved in HDMI standard for synchronization but may be in files and since the values of Cb and Cr are only little restricted a lot of high saturated colors outside the 0 255 RGB space can be encoded For example if YCbCr is 255 128 128 in the case of a full level YCbCr encoding 0 255 then the corresponding R G B is 255 255 255 which is the maximum encodable luminance value in this color space But if Y 255 and Cr and or Cb are not 128 this codes for the maximum luminance but with an added color one primary must necessarily be above 255 and cannot be converted to R G B Adapted software and hardware must be used during production to not clip the video data levels that are above the sRGB space This is almost never the case for software working with an RGB core The more complex example is YCbCr BT 709 values 139 151 24 that is RGB 21 182 181 That is out of gamut for BT 709 but is not for sYCC and xvYCC709 and to convert those values to display gamut you would convert to XYZ 0 27018 0 40327 0 54109 and then to display gamut 11 The XYZ matrix is as specified in Nvidia docs 12 Adoption EditA mechanism for signaling xvYCC support and transmitting the gamut boundary definition for xvYCC has been defined in the HDMI 1 3 Specification No new mechanism is required for transmitting the xvYCC data itself as it is compatible with HDMI s existing YCbCr formats but the display needs to signal its readiness to accept the extra gamut xvYCC values in Colorimetry block of EDID flags xvYCC709 and xvYCC601 and the source needs to signal the actual gamut in use in AVI InfoFrame and use gamut metadata packets to help the display to intelligently adapt extreme colors to its own gamut limitations This should not be confused with HDMI 1 3 s other new color feature deep color This is a separate feature that increases the precision of brightness and color information and is independent of xvYCC xvYCC is not supported by DVD Video but is supported by the high definition recording format AVCHD and PlayStation 3 and Blu ray It is also supported by some cameras like Sony HDR CX405 that does actually tag the video as xvYCC with BT 709 inside Sony s XAVC 13 History EditOn January 7 2013 Sony announced that it would release Mastered in 4K Blu ray Disc titles which are sourced at 4K and encoded at 1080p 14 Mastered in 4K 1080p Blu ray Disc titles can be played on existing Blu ray Disc players and will support a larger color space using xvYCC 14 15 16 On May 30 2013 Eye IO announced that their encoding technology was licensed by Sony Pictures Entertainment to deliver 4K Ultra HD video with their Sony 4K Video Unlimited Service 17 18 Eye IO encodes their video assets at 3840 x 2160 and includes support for the xvYCC color space 17 18 Hardware support EditThe following graphics hardware support xvYCC color space when connected to a display device supporting xvYCC AMD Mobility Radeon HD 4000 series and newer models AMD Radeon HD 5000 series and newer models AMD 785G 880G and 890GX chipsets with integrated graphics Intel HD Graphics integrated on some CPUs except Pentium G6950 and Celeron G1101 nVidia GeForce 200 series and newer modelsReferences Edit HDMI 1 3 Update PDF HDMI Licensing 2006 Retrieved 2006 08 30 新動画用拡張色空間 xvYCC IEC61966 2 4 PDF Color gamuts of Rec709 and xvYCC res18h39 netlify app Retrieved 2021 01 29 a b c d e f xvYCC Sony Global Archived from the original on August 29 2009 Retrieved 2009 08 13 a b c d Tatsuhiko Matsumoto Yoshihide Shimpuku Takehiro Nakatsue Shuichi Haga Hiroaki Eto Yoshiyuki Akiyama amp Naoya Katoh 2006 19 2 xvYCC A New Standard for Video Systems using Extended Gamut YCC Color Space SID INTERNATIONAL SYMPOSIUM Society for Information Display pp 1130 1133 doi 10 1889 1 2433175 A DTV Profile for Uncompressed High Speed Digital Interfaces ANSI CTA 861 H Consumer Technology Association p 44 Retrieved 2021 03 11 Naoya Katoh 2007 New Extended gamut Color Space for Video Applications xvYCC IEC61966 2 4 PDF Hollywood Post Alliance Archived from the original PDF on 2021 03 31 Retrieved 2009 08 13 a b H 273 Coding independent code points for video signal type identification www itu int Retrieved 2020 12 25 IEC 61966 2 4 2006 IEC Webstore webstore iec ch Retrieved 2021 01 29 Xu Yan Li Yan Li Guiling May 2009 A kind of nonlinear quantization method to extend the color gamut of DTV system 2009 IEEE 13th International Symposium on Consumer Electronics 141 143 doi 10 1109 ISCE 2009 5156953 Color Calculator res18h39 netlify app Retrieved 25 January 2021 NVIDIA 2D Image And Signal Performance Primitives NPP RGBToXYZ docs nvidia com Retrieved 2021 01 29 XAVC S How to export time date metadata to subtitles srt www videohelp com a b Richard Lawler 2013 01 07 Sony to launch 4K digital distribution network this summer mastered in 4K Blu ray discs Engadget Retrieved 2013 05 30 Seamus Byrne 2013 05 01 Sony mastered in 4K Blu rays a mixed blessing CNET Retrieved 2013 05 30 What is Mastered in 4K and does it make a difference Trusted Reviews 2014 03 10 Retrieved 2020 12 24 a b eyeIO Delivers Unprecedented Viewing Experience for Sony Pictures Content on Sony 4K UltraHD TVs Eye IO LLC 2013 05 30 Retrieved 2013 06 05 a b Todd Sprangler 2013 05 30 Sony Gears Up for 4K Ultra HD Internet Movie Service Variety Retrieved 2013 06 05 External links EditIEC Web Store for IEC 61966 2 4 Retrieved from https en wikipedia org w index php title XvYCC amp oldid 1045394382, wikipedia, wiki, book,

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