Chrominance - Revision history

TheZacher5645: Matrix -> Rotation matrix link

2024-06-26T21:49:31Z

Matrix -> Rotation matrix link

← Previous revision		Revision as of 21:49, 26 June 2024
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	==Digital systems==		==Digital systems==
	Digital video and digital still photography systems sometimes use a luma/chroma decomposition for improved compression. For example, when an ordinary [[RGB]] digital image is compressed via the [[JPEG]] standard, the RGB color space is first converted (by a ~~rotation~~ [[~~matrix~~ ~~(mathematics)\|~~matrix]]) to a [[YCbCr]] color space, because the three components in that space have less correlation redundancy and because the chrominance components can then be subsampled by a factor of 2 or 4 to further compress the image. On decompression, the Y′CbCr space is rotated back to RGB.		Digital video and digital still photography systems sometimes use a luma/chroma decomposition for improved compression. For example, when an ordinary [[RGB]] digital image is compressed via the [[JPEG]] standard, the RGB color space is first converted (by a [[rotation matrix]]) to a [[YCbCr]] color space, because the three components in that space have less correlation redundancy and because the chrominance components can then be subsampled by a factor of 2 or 4 to further compress the image. On decompression, the Y′CbCr space is rotated back to RGB.

	==See also==		==See also==

DaGizza: ce

2023-12-13T23:13:58Z

← Previous revision		Revision as of 23:13, 13 December 2023
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	{{One source\|date=April 2023}}		{{One source\|date=April 2023}}
	[[File:Luma Chroma both.png\|thumb\|Luminance only, Chrominance only, and full color image.]]		[[File:Luma Chroma both.png\|thumb\|Luminance only, Chrominance only, and full color image.]]
	'''Chrominance''' (''chroma'' or ''C'' for short) is the signal used in [[video]] systems to convey the [[color]] information of the picture (see [[YUV]] color model), separately from the accompanying [[Luma (video)\|luma]] signal (or Y' for short). Chrominance is usually represented as two color-difference components: U = [[B-Y\|B′ − Y′]] (blue − luma) and V = [[R-Y\|R′ − Y′]] (red − luma). Each of these ~~difference~~ components may have scale factors and offsets applied to it, as specified by the applicable video standard.		'''Chrominance''' (''chroma'' or ''C'' for short) is the signal used in [[video]] systems to convey the [[color]] information of the picture (see [[YUV]] color model), separately from the accompanying [[Luma (video)\|luma]] signal (or Y' for short). Chrominance is usually represented as two color-difference components: U = [[B-Y\|B′ − Y′]] (blue − luma) and V = [[R-Y\|R′ − Y′]] (red − luma). Each of these different components may have scale factors and offsets applied to it, as specified by the applicable video standard.

	In [[composite video]] signals, the U and V signals modulate a color [[subcarrier]] signal, and the result is referred to as the chrominance signal; the [[Phase (waves)\|phase]] and [[amplitude]] of this modulated chrominance signal correspond approximately to the [[hue]] and [[Saturation (color theory)\|saturation]] of the color. In digital-video and still-image [[color space]]s such as [[Y′CbCr]], the luma and chrominance components are digital sample values.		In [[composite video]] signals, the U and V signals modulate a color [[subcarrier]] signal, and the result is referred to as the chrominance signal; the [[Phase (waves)\|phase]] and [[amplitude]] of this modulated chrominance signal correspond approximately to the [[hue]] and [[Saturation (color theory)\|saturation]] of the color. In digital-video and still-image [[color space]]s such as [[Y′CbCr]], the luma and chrominance components are digital sample values.

Me, Myself, and I are Here: /* See also */ alpha

2023-11-21T03:55:31Z

Billjones94 at 12:39, 15 October 2023

2023-10-15T12:39:13Z

← Previous revision		Revision as of 12:39, 15 October 2023
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	'''Chrominance''' (''chroma'' or ''C'' for short) is the signal used in [[video]] systems to convey the [[color]] information of the picture (see [[YUV]] color model), separately from the accompanying [[Luma (video)\|luma]] signal (or Y' for short). Chrominance is usually represented as two color-difference components: U = [[B-Y\|B′ − Y′]] (blue − luma) and V = [[R-Y\|R′ − Y′]] (red − luma). Each of these difference components may have scale factors and offsets applied to it, as specified by the applicable video standard.		'''Chrominance''' (''chroma'' or ''C'' for short) is the signal used in [[video]] systems to convey the [[color]] information of the picture (see [[YUV]] color model), separately from the accompanying [[Luma (video)\|luma]] signal (or Y' for short). Chrominance is usually represented as two color-difference components: U = [[B-Y\|B′ − Y′]] (blue − luma) and V = [[R-Y\|R′ − Y′]] (red − luma). Each of these difference components may have scale factors and offsets applied to it, as specified by the applicable video standard.

	In [[composite video]] signals, the U and V signals modulate a color [[subcarrier]] signal, and the result is referred to as the chrominance signal; the [[Phase (waves)\|phase]] and [[amplitude]] of this modulated chrominance signal correspond approximately to the [[hue]] and [[Saturation (color theory)\|saturation]] of the color. In digital-video and still-image [[color space]]s such as [[Y′CbCr]], the luma and chrominance components are digital sample values.		In [[composite video]] signals, the U and V signals modulate a color [[subcarrier]] signal, and the result is referred to as the chrominance signal; the [[Phase (waves)\|phase]] and [[amplitude]] of this modulated chrominance signal correspond approximately to the [[hue]] and [[Saturation (color theory)\|saturation]] of the color. In digital-video and still-image [[color space]]s such as [[Y′CbCr]], the luma and chrominance components are digital sample values.

	Separating [[RGB]] color signals into luma and chrominance allows the [[Bandwidth (signal processing)\|bandwidth]] of each to be determined separately. Typically, the chrominance bandwidth is reduced in analog composite video by reducing the bandwidth of a modulated color subcarrier, and in digital systems by [[chroma subsampling]].		Separating [[RGB]] color signals into luma and chrominance allows the [[Bandwidth (signal processing)\|bandwidth]] of each to be determined separately. Typically, the chrominance bandwidth is reduced in analog composite video by reducing the bandwidth of a modulated color subcarrier, and in digital systems by [[chroma subsampling]].

	==History==		==History==

99.165.47.46: "color space" is 2 words, according to Wikipedia

2023-07-17T07:26:16Z

"color space" is 2 words, according to Wikipedia

← Previous revision		Revision as of 07:26, 17 July 2023
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	==Digital systems==		==Digital systems==
	Digital video and digital still photography systems sometimes use a luma/chroma decomposition for improved compression. For example, when an ordinary [[RGB]] digital image is compressed via the [[JPEG]] standard, the RGB ~~colorspace~~ is first converted (by a rotation [[matrix (mathematics)\|matrix]]) to a [[YCbCr]] ~~colorspace~~, because the three components in that space have less correlation redundancy and because the chrominance components can then be subsampled by a factor of 2 or 4 to further compress the image. On decompression, the Y′CbCr space is rotated back to RGB.		Digital video and digital still photography systems sometimes use a luma/chroma decomposition for improved compression. For example, when an ordinary [[RGB]] digital image is compressed via the [[JPEG]] standard, the RGB color space is first converted (by a rotation [[matrix (mathematics)\|matrix]]) to a [[YCbCr]] color space, because the three components in that space have less correlation redundancy and because the chrominance components can then be subsampled by a factor of 2 or 4 to further compress the image. On decompression, the Y′CbCr space is rotated back to RGB.

	==See also==		==See also==

NintendoTTTEfan2005 at 17:16, 27 April 2023

2023-04-27T17:16:55Z

← Previous revision		Revision as of 17:16, 27 April 2023
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	{{Short description\|Colour in an image or video}}		{{Short description\|Colour in an image or video}}
			{{One source\|date=April 2023}}
	[[File:Luma Chroma both.png\|thumb\|Luminance only, Chrominance only, and full color image.]]		[[File:Luma Chroma both.png\|thumb\|Luminance only, Chrominance only, and full color image.]]
	'''Chrominance''' (''chroma'' or ''C'' for short) is the signal used in [[video]] systems to convey the [[color]] information of the picture (see [[YUV]] color model), separately from the accompanying [[Luma (video)\|luma]] signal (or Y' for short). Chrominance is usually represented as two color-difference components: U = [[B-Y\|B′ − Y′]] (blue − luma) and V = [[R-Y\|R′ − Y′]] (red − luma). Each of these difference components may have scale factors and offsets applied to it, as specified by the applicable video standard.		'''Chrominance''' (''chroma'' or ''C'' for short) is the signal used in [[video]] systems to convey the [[color]] information of the picture (see [[YUV]] color model), separately from the accompanying [[Luma (video)\|luma]] signal (or Y' for short). Chrominance is usually represented as two color-difference components: U = [[B-Y\|B′ − Y′]] (blue − luma) and V = [[R-Y\|R′ − Y′]] (red − luma). Each of these difference components may have scale factors and offsets applied to it, as specified by the applicable video standard.

RiygaHexblood: /* History */

2023-03-08T02:22:40Z

History

← Previous revision		Revision as of 02:22, 8 March 2023
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	==History==		==History==
	The idea of transmitting a [[color television]] signal with distinct [[Luma (video)\|luma]] and chrominance components originated with [[Georges Valensi]], who patented the idea in 1938.<ref>French patent 841335, issued Feb. 6, 1939; cited in U.S. Patent 2375966 [~~http~~://~~www~~.google.com/~~patents?id=dbhHAAAAEBAJ&printsec=abstract&zoom=4&dq=ininventor:valensi+color+television#PPA20~~,M1 "System of Television in Colors"], issued May 15, 1945.</ref> Valensi's patent application described:		The idea of transmitting a [[color television]] signal with distinct [[Luma (video)\|luma]] and chrominance components originated with [[Georges Valensi]], who patented the idea in 1938.<ref>French patent 841335, issued Feb. 6, 1939; cited in U.S. Patent 2375966 [https://patents.google.com/patent/US2375966A/en,M1 "System of Television in Colors"], issued May 15, 1945.</ref> Valensi's patent application described:

	<blockquote>		<blockquote>

Ffffrr: Adding local short description: "Colour in an image or video", overriding Wikidata description "colour in an image or video; part of information or signal describing the colour but not brightness (shade of grey)" (Shortdesc helper)

2022-04-15T08:00:19Z

Adding local short description: "Colour in an image or video", overriding Wikidata description "colour in an image or video; part of information or signal describing the colour but not brightness (shade of grey)" (Shortdesc helper)

← Previous revision		Revision as of 08:00, 15 April 2022
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			{{Short description\|Colour in an image or video}}
	[[File:Luma Chroma both.png\|thumb\|Luminance only, Chrominance only, and full color image.]]		[[File:Luma Chroma both.png\|thumb\|Luminance only, Chrominance only, and full color image.]]
	'''Chrominance''' (''chroma'' or ''C'' for short) is the signal used in [[video]] systems to convey the [[color]] information of the picture (see [[YUV]] color model), separately from the accompanying [[Luma (video)\|luma]] signal (or Y' for short). Chrominance is usually represented as two color-difference components: U = [[B-Y\|B′ − Y′]] (blue − luma) and V = [[R-Y\|R′ − Y′]] (red − luma). Each of these difference components may have scale factors and offsets applied to it, as specified by the applicable video standard.		'''Chrominance''' (''chroma'' or ''C'' for short) is the signal used in [[video]] systems to convey the [[color]] information of the picture (see [[YUV]] color model), separately from the accompanying [[Luma (video)\|luma]] signal (or Y' for short). Chrominance is usually represented as two color-difference components: U = [[B-Y\|B′ − Y′]] (blue − luma) and V = [[R-Y\|R′ − Y′]] (red − luma). Each of these difference components may have scale factors and offsets applied to it, as specified by the applicable video standard.

4throck at 08:53, 22 March 2022

2022-03-22T08:53:24Z

← Previous revision		Revision as of 08:53, 22 March 2022
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	[[File:Luma Chroma both.png\|thumb\|Luminance only, Chrominance only, and full color image.]]		[[File:Luma Chroma both.png\|thumb\|Luminance only, Chrominance only, and full color image.]]
	'''Chrominance''' (''chroma'' or ''C'' for short) is the signal used in [[video]] systems to convey the [[color]] information of the picture, separately from the accompanying [[Luma (video)\|luma]] signal (or Y' for short). Chrominance is usually represented as two color-difference components: U = [[B-Y\|B′ − Y′]] (blue − luma) and V = [[R-Y\|R′ − Y′]] (red − luma). Each of these difference components may have scale factors and offsets applied to it, as specified by the applicable video standard.		'''Chrominance''' (''chroma'' or ''C'' for short) is the signal used in [[video]] systems to convey the [[color]] information of the picture (see [[YUV]] color model), separately from the accompanying [[Luma (video)\|luma]] signal (or Y' for short). Chrominance is usually represented as two color-difference components: U = [[B-Y\|B′ − Y′]] (blue − luma) and V = [[R-Y\|R′ − Y′]] (red − luma). Each of these difference components may have scale factors and offsets applied to it, as specified by the applicable video standard.

	In [[composite video]] signals, the U and V signals modulate a color [[subcarrier]] signal, and the result is referred to as the chrominance signal; the [[Phase (waves)\|phase]] and [[amplitude]] of this modulated chrominance signal correspond approximately to the [[hue]] and [[Saturation (color theory)\|saturation]] of the color. In digital-video and still-image [[color space]]s such as [[Y′CbCr]], the luma and chrominance components are digital sample values.		In [[composite video]] signals, the U and V signals modulate a color [[subcarrier]] signal, and the result is referred to as the chrominance signal; the [[Phase (waves)\|phase]] and [[amplitude]] of this modulated chrominance signal correspond approximately to the [[hue]] and [[Saturation (color theory)\|saturation]] of the color. In digital-video and still-image [[color space]]s such as [[Y′CbCr]], the luma and chrominance components are digital sample values.

4throck at 08:50, 22 March 2022

2022-03-22T08:50:52Z

← Previous revision		Revision as of 08:50, 22 March 2022
Line 1:		Line 1:
	[[File:Luma Chroma both.png\|thumb\|Luminance only, Chrominance only, and full color image.]]		[[File:Luma Chroma both.png\|thumb\|Luminance only, Chrominance only, and full color image.]]
	'''Chrominance''' (''chroma'' or ''C'' for short) is the signal used in [[video]] systems to convey the [[color]] information of the picture, separately from the accompanying [[Luma (video)\|luma]] signal (or Y' for short). Chrominance is usually represented as two color-difference components: U = B′ − Y′ (blue − luma) and V = R′ − Y′ (red − luma). Each of these difference components may have scale factors and offsets applied to it, as specified by the applicable video standard.		'''Chrominance''' (''chroma'' or ''C'' for short) is the signal used in [[video]] systems to convey the [[color]] information of the picture, separately from the accompanying [[Luma (video)\|luma]] signal (or Y' for short). Chrominance is usually represented as two color-difference components: U = [[B-Y\|B′ − Y′]] (blue − luma) and V = [[R-Y\|R′ − Y′]] (red − luma). Each of these difference components may have scale factors and offsets applied to it, as specified by the applicable video standard.

	In [[composite video]] signals, the U and V signals modulate a color [[subcarrier]] signal, and the result is referred to as the chrominance signal; the [[Phase (waves)\|phase]] and [[amplitude]] of this modulated chrominance signal correspond approximately to the [[hue]] and [[Saturation (color theory)\|saturation]] of the color. In digital-video and still-image [[color space]]s such as [[Y′CbCr]], the luma and chrominance components are digital sample values.		In [[composite video]] signals, the U and V signals modulate a color [[subcarrier]] signal, and the result is referred to as the chrominance signal; the [[Phase (waves)\|phase]] and [[amplitude]] of this modulated chrominance signal correspond approximately to the [[hue]] and [[Saturation (color theory)\|saturation]] of the color. In digital-video and still-image [[color space]]s such as [[Y′CbCr]], the luma and chrominance components are digital sample values.

← Previous revision		Revision as of 23:13, 13 December 2023
Line 2:		Line 2:
	{{One source\|date=April 2023}}		{{One source\|date=April 2023}}
	[[File:Luma Chroma both.png\|thumb\|Luminance only, Chrominance only, and full color image.]]		[[File:Luma Chroma both.png\|thumb\|Luminance only, Chrominance only, and full color image.]]
	'''Chrominance''' (''chroma'' or ''C'' for short) is the signal used in [[video]] systems to convey the [[color]] information of the picture (see [[YUV]] color model), separately from the accompanying [[Luma (video)\|luma]] signal (or Y' for short). Chrominance is usually represented as two color-difference components: U = [[B-Y\|B′ − Y′]] (blue − luma) and V = [[R-Y\|R′ − Y′]] (red − luma). Each of these ~~difference~~ components may have scale factors and offsets applied to it, as specified by the applicable video standard.		'''Chrominance''' (''chroma'' or ''C'' for short) is the signal used in [[video]] systems to convey the [[color]] information of the picture (see [[YUV]] color model), separately from the accompanying [[Luma (video)\|luma]] signal (or Y' for short). Chrominance is usually represented as two color-difference components: U = [[B-Y\|B′ − Y′]] (blue − luma) and V = [[R-Y\|R′ − Y′]] (red − luma). Each of these different components may have scale factors and offsets applied to it, as specified by the applicable video standard.

	In [[composite video]] signals, the U and V signals modulate a color [[subcarrier]] signal, and the result is referred to as the chrominance signal; the [[Phase (waves)\|phase]] and [[amplitude]] of this modulated chrominance signal correspond approximately to the [[hue]] and [[Saturation (color theory)\|saturation]] of the color. In digital-video and still-image [[color space]]s such as [[Y′CbCr]], the luma and chrominance components are digital sample values.		In [[composite video]] signals, the U and V signals modulate a color [[subcarrier]] signal, and the result is referred to as the chrominance signal; the [[Phase (waves)\|phase]] and [[amplitude]] of this modulated chrominance signal correspond approximately to the [[hue]] and [[Saturation (color theory)\|saturation]] of the color. In digital-video and still-image [[color space]]s such as [[Y′CbCr]], the luma and chrominance components are digital sample values.

← Previous revision		Revision as of 03:55, 21 November 2023
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	==See also==		==See also==
⚫	* [[Luma (video)]]
	* [[Chroma subsampling]]		* [[Chroma subsampling]]
		⚫	* [[Luma (video)]]

	==References==		==References==

← Previous revision		Revision as of 17:16, 27 April 2023
Line 1:		Line 1:
	{{Short description\|Colour in an image or video}}		{{Short description\|Colour in an image or video}}
			{{One source\|date=April 2023}}
	[[File:Luma Chroma both.png\|thumb\|Luminance only, Chrominance only, and full color image.]]		[[File:Luma Chroma both.png\|thumb\|Luminance only, Chrominance only, and full color image.]]
	'''Chrominance''' (''chroma'' or ''C'' for short) is the signal used in [[video]] systems to convey the [[color]] information of the picture (see [[YUV]] color model), separately from the accompanying [[Luma (video)\|luma]] signal (or Y' for short). Chrominance is usually represented as two color-difference components: U = [[B-Y\|B′ − Y′]] (blue − luma) and V = [[R-Y\|R′ − Y′]] (red − luma). Each of these difference components may have scale factors and offsets applied to it, as specified by the applicable video standard.		'''Chrominance''' (''chroma'' or ''C'' for short) is the signal used in [[video]] systems to convey the [[color]] information of the picture (see [[YUV]] color model), separately from the accompanying [[Luma (video)\|luma]] signal (or Y' for short). Chrominance is usually represented as two color-difference components: U = [[B-Y\|B′ − Y′]] (blue − luma) and V = [[R-Y\|R′ − Y′]] (red − luma). Each of these difference components may have scale factors and offsets applied to it, as specified by the applicable video standard.

← Previous revision		Revision as of 08:00, 15 April 2022
Line 1:		Line 1:
			{{Short description\|Colour in an image or video}}
	[[File:Luma Chroma both.png\|thumb\|Luminance only, Chrominance only, and full color image.]]		[[File:Luma Chroma both.png\|thumb\|Luminance only, Chrominance only, and full color image.]]
	'''Chrominance''' (''chroma'' or ''C'' for short) is the signal used in [[video]] systems to convey the [[color]] information of the picture (see [[YUV]] color model), separately from the accompanying [[Luma (video)\|luma]] signal (or Y' for short). Chrominance is usually represented as two color-difference components: U = [[B-Y\|B′ − Y′]] (blue − luma) and V = [[R-Y\|R′ − Y′]] (red − luma). Each of these difference components may have scale factors and offsets applied to it, as specified by the applicable video standard.		'''Chrominance''' (''chroma'' or ''C'' for short) is the signal used in [[video]] systems to convey the [[color]] information of the picture (see [[YUV]] color model), separately from the accompanying [[Luma (video)\|luma]] signal (or Y' for short). Chrominance is usually represented as two color-difference components: U = [[B-Y\|B′ − Y′]] (blue − luma) and V = [[R-Y\|R′ − Y′]] (red − luma). Each of these difference components may have scale factors and offsets applied to it, as specified by the applicable video standard.

← Previous revision		Revision as of 08:53, 22 March 2022
Line 1:		Line 1:
	[[File:Luma Chroma both.png\|thumb\|Luminance only, Chrominance only, and full color image.]]		[[File:Luma Chroma both.png\|thumb\|Luminance only, Chrominance only, and full color image.]]
	'''Chrominance''' (''chroma'' or ''C'' for short) is the signal used in [[video]] systems to convey the [[color]] information of the picture, separately from the accompanying [[Luma (video)\|luma]] signal (or Y' for short). Chrominance is usually represented as two color-difference components: U = [[B-Y\|B′ − Y′]] (blue − luma) and V = [[R-Y\|R′ − Y′]] (red − luma). Each of these difference components may have scale factors and offsets applied to it, as specified by the applicable video standard.		'''Chrominance''' (''chroma'' or ''C'' for short) is the signal used in [[video]] systems to convey the [[color]] information of the picture (see [[YUV]] color model), separately from the accompanying [[Luma (video)\|luma]] signal (or Y' for short). Chrominance is usually represented as two color-difference components: U = [[B-Y\|B′ − Y′]] (blue − luma) and V = [[R-Y\|R′ − Y′]] (red − luma). Each of these difference components may have scale factors and offsets applied to it, as specified by the applicable video standard.

	In [[composite video]] signals, the U and V signals modulate a color [[subcarrier]] signal, and the result is referred to as the chrominance signal; the [[Phase (waves)\|phase]] and [[amplitude]] of this modulated chrominance signal correspond approximately to the [[hue]] and [[Saturation (color theory)\|saturation]] of the color. In digital-video and still-image [[color space]]s such as [[Y′CbCr]], the luma and chrominance components are digital sample values.		In [[composite video]] signals, the U and V signals modulate a color [[subcarrier]] signal, and the result is referred to as the chrominance signal; the [[Phase (waves)\|phase]] and [[amplitude]] of this modulated chrominance signal correspond approximately to the [[hue]] and [[Saturation (color theory)\|saturation]] of the color. In digital-video and still-image [[color space]]s such as [[Y′CbCr]], the luma and chrominance components are digital sample values.