Information about Xvycc
xvYCC or Extended-gamut YCC is a color space used in the video electronics of flat panel television sets, supporting 1.8 times as many colors as the sRGB color space.[1] xvYCC was specified by the IEC in October 2005 and published in January 2006 as IEC 61966-2-4. The wider spectrum of LED backlighting replacing cold cathodes has enabled this extension of the LCD display color gamut.
xvYCC uses the full range of values (1 to 254 in an 8-bit space) to represent colors. In BT.601 and BT.709, RGB colors are represented only by 8-bit values from 16 to 235. This limited range was established to allow for undershoot and overshoot, attributes of analog TV signaling. With digital TV signaling, there is no undershoot or overshoot, and the values from 1-15 and 235-254 can be used to represent real colors. In order to maintain backward-compatibility with earlier standards, the red (R), green (G), blue (B) and white standard colors are still calculated at the same indices in the color space. The wider ranges of digital values allow representation of deeper greens, deeper reds, and deeper blues - and of course intermediate colors previously beyond the boundary limit in the CCIR 601 color space.
Even the high-definition television color space defined by BT.709-5 encompasses only 45 per cent of the possible values with RGB indices of 1 to 254, since those indices are limited to 16 to 234 by the BT spec. The xvYCC standard uses 1 to 255, and can encode more than twice the number of color values. (The sRGB system is in between the BT.706-1 and xvYCC systems, allowing use of all combinations of R, G and B values from 16 to 235 - more combinations, but not so many as in xvYCC.)
In a paper published by Society for Information Display in 2006, the authors mapped the 769 colors in the Munsell Color Cascade to the BT.706-5 space and to the xvYCC space. 55% of the Munsell colors could be mapped to the sRGB gamut, but 100% of those colors could map to the xvYCC gamut.[2] Deeper hues can be created - for example a deeper red by giving the opposing color (green) a negative coefficient.
A mechanism for carrying the gamut boundary definition for xvYCC has been defined in the HDMI 1.3 Specification. Although HDMI 1.3's other new color feature — Deep Color — is not required to transport xvYCC color information, it is commonly associated with xvYCC because these features are used together in high-end CE systems to improve the viewing image quality. Above 480p and 576p, Deep Color systems should use Category 2 HDMI cables (indicated by a logo), which are qualified for link clock rates above 75MHz.[3]
xvYCC uses the full range of values (1 to 254 in an 8-bit space) to represent colors. In BT.601 and BT.709, RGB colors are represented only by 8-bit values from 16 to 235. This limited range was established to allow for undershoot and overshoot, attributes of analog TV signaling. With digital TV signaling, there is no undershoot or overshoot, and the values from 1-15 and 235-254 can be used to represent real colors. In order to maintain backward-compatibility with earlier standards, the red (R), green (G), blue (B) and white standard colors are still calculated at the same indices in the color space. The wider ranges of digital values allow representation of deeper greens, deeper reds, and deeper blues - and of course intermediate colors previously beyond the boundary limit in the CCIR 601 color space.
Even the high-definition television color space defined by BT.709-5 encompasses only 45 per cent of the possible values with RGB indices of 1 to 254, since those indices are limited to 16 to 234 by the BT spec. The xvYCC standard uses 1 to 255, and can encode more than twice the number of color values. (The sRGB system is in between the BT.706-1 and xvYCC systems, allowing use of all combinations of R, G and B values from 16 to 235 - more combinations, but not so many as in xvYCC.)
In a paper published by Society for Information Display in 2006, the authors mapped the 769 colors in the Munsell Color Cascade to the BT.706-5 space and to the xvYCC space. 55% of the Munsell colors could be mapped to the sRGB gamut, but 100% of those colors could map to the xvYCC gamut.[2] Deeper hues can be created - for example a deeper red by giving the opposing color (green) a negative coefficient.
A mechanism for carrying the gamut boundary definition for xvYCC has been defined in the HDMI 1.3 Specification. Although HDMI 1.3's other new color feature — Deep Color — is not required to transport xvYCC color information, it is commonly associated with xvYCC because these features are used together in high-end CE systems to improve the viewing image quality. Above 480p and 576p, Deep Color systems should use Category 2 HDMI cables (indicated by a logo), which are qualified for link clock rates above 75MHz.[3]
References
1. ^ HDMI 1.3 Update. HDMI Licensing (2006). Retrieved on 2006-08-30.
2. ^ Matsumoto et al, 19.2: xvYCC: A New Standard for Video Systems using Extended-Gamut YCC Color Space, SID '06 Digest, pp. 1130-1133. Available from [1]
3. ^ For EDTV modes (480p and 576p), even the 12-bit Deep Color data can be transported across the link using a clock well below the upper bandwidth limit of Category 1 cables.
2. ^ Matsumoto et al, 19.2: xvYCC: A New Standard for Video Systems using Extended-Gamut YCC Color Space, SID '06 Digest, pp. 1130-1133. Available from [1]
3. ^ For EDTV modes (480p and 576p), even the 12-bit Deep Color data can be transported across the link using a clock well below the upper bandwidth limit of Category 1 cables.
See also
- HDMI 1.3
- Deep Color
External links
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YCbCr or Y'CbCr is a family of color spaces used in video and digital photography systems. Y' is the luma component and Cb and Cr are the blue and red chroma components. The prime on the Y is to distinguish the luma from luminance.
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color space. For example, Adobe RGB and sRGB are two different absolute color spaces, both based on the RGB model.
In the most generic sense of the definition above, color spaces can be defined without the use of a color model.
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In the most generic sense of the definition above, color spaces can be defined without the use of a color model.
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Video (Latin for "I see", first person singular present, indicative of videre, "to see") is the technology of electronically capturing, recording, processing, storing, transmitting, and reconstructing a sequence of still images representing scenes in motion.
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sRGB is a standard RGB (Red Green Blue) color space created cooperatively by HP and Microsoft for use on monitors, printers, and the Internet. It was originally proposed in 1995 by Ralf Kuron of FOGRA as a pragmatic approach in connection to ICC.
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The International Electrotechnical Commission[1] (IEC) is a not-for-profit, non-governmental international standards organization that prepares and publishes International Standards for all electrical, electronic and related technologies – collectively known
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In order to distinguish standards published by the International Electrotechnical Commission numerically from other international standards, their number range was shifted in 1997 by adding 60000. So what used to be called IEC 27 is now officially IEC 60027, and so on.
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light-emitting diode (LED) is a semiconductor diode that emits incoherent narrow-spectrum light when electrically biased in the forward direction of the p-n junction. This effect is a form of electroluminescence.
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cold cathode is an element used within some Nixie tubes, gas discharge lamps, gas filled tubes, and vacuum tubes. Cold cathodes do not employ a cathode heater.
Cold cathode fluorescent lamps (CCFL) usually also called as cold cathodes.
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Cold cathode fluorescent lamps (CCFL) usually also called as cold cathodes.
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liquid crystal display (commonly abbreviated LCD) is a thin, flat display device made up of any number of color or monochrome pixels arrayed in front of a light source or reflector.
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The term overshoot has the following meanings:
In electronics "overshoot" can mean:
1. In the transition of any parameter from one value to another, the transitory value of the parameter that exceeds the final (steady state) value.
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Electronics
In electronics "overshoot" can mean:
1. In the transition of any parameter from one value to another, the transitory value of the parameter that exceeds the final (steady state) value.
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The term overshoot has the following meanings:
In electronics "overshoot" can mean:
1. In the transition of any parameter from one value to another, the transitory value of the parameter that exceeds the final (steady state) value.
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Electronics
In electronics "overshoot" can mean:
1. In the transition of any parameter from one value to another, the transitory value of the parameter that exceeds the final (steady state) value.
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In technology, especially computing (irrespective of platform), a product is said to be backward compatible (or downward compatible) when it is able to take the place of an older product, by interoperating with other products that were designed for the older product.
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CCIR 601 is the old name of a standard published by the CCIR (now ITU-R) for encoding interlaced analogue video signals in digital form. The new name of the standard is ITU-R BT.601, but the old name is still in common use in informal contexts.
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High-definition television (HDTV) is a digital television broadcasting system with a significantly higher resolution than traditional formats (NTSC, SECAM, PAL). While some early analog HDTV formats were broadcast in Europe and Japan, HDTV is usually broadcast digitally,
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sRGB is a standard RGB (Red Green Blue) color space created cooperatively by HP and Microsoft for use on monitors, printers, and the Internet. It was originally proposed in 1995 by Ralf Kuron of FOGRA as a pragmatic approach in connection to ICC.
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gamut, or color gamut (pronounced /ˈgæmət/), is a certain complete subset of colors. The most common usage refers to the subset of colors which can be accurately represented in a given circumstance,
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High-Definition Multimedia Interface (HDMI) is a licensable audio/video connector interface for transmitting uncompressed, encrypted digital streams. HDMI connects DRM-enforcing digital audio/video sources, such as a set-top box, a Blu-ray Disc player, a PC running Windows
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480p is the shorthand name for a video display resolution. The p stands for progressive scan, i.e. non-interlaced, while the 480 denotes a vertical resolution of 480 vertical scanning lines, usually with a horizontal resolution of 640 pixels and 4:3 aspect ratio
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576p is the shorthand name for a video mode. The p stands for progressive scan, i.e. non-interlaced, the 576 for a vertical resolution of 576 lines, usually with a horizontal resolution of 720 or 704 pixels. The frame rate can be given explicitly after the letter.
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Deep Color refers to the use of 30-bit, 36-bit, and 48-bit color in displays. This extra bit depth is required to reduce posterization with extended gamuts such as xvYCC, and therefore has been included as an optional part of the HDMI 1.3 standard.
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