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Topic: YCbCr

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	YourArt.com >> Encyclopedia >> YCbCr (Site not responding. Last check: 2007-11-04)
		YCbCr signals (prior to scaling and offsets to place the signals into digital form) are called YPbPr, and are created from the corresponding gamma-adjusted RGB (red, green and blue) source using two defined constants Kb and Kr as follows:
		This form of YCbCr is used primarily for older standard-definition television systems, as it uses an RGB model that fits the phosphor emission characteristics of older CRTs.
		Since the equations defining YCbCr are formed in a way that rotates the entire nominal RGB color cube and scales it to fit within a (larger) YCbCr color cube, there are some points within the YCbCr color cube that cannot be represented in the corresponding RGB domain (at least not within the nominal RGB range).
	www.yourart.com /research/encyclopedia.cgi?subject=/YCbCr (1136 words)

	LibTiff Mailing List Archive, "Re: Jpeg and YCbCr", by Joris Van Damme
		2005.05.26 01:50 "Re: Jpeg and YCbCr", by Kelvin Zhong
		2005.05.26 10:02 "Re: Jpeg and YCbCr", by Kelvin Zhong
		2005.05.26 08:58 "Re: Jpeg and YCbCr", by Kelvin Zhong
	www.asmail.be /msg0054753769.html (721 words)

	RFC 4175 (rfc4175) - RTP Payload Format for Uncompressed Video
		In the case of YCbCr components, the Cb and Cr components are horizontally sub-sampled by a factor of two (4:2:2 color encoding).
		If YCbCr format data is being transported, this is the pixel offset of the luminance sample; if RGB format data is being transported, it is the pixel offset of the red sample; if BGR format data is being transported, it is the pixel offset of the blue sample.
		For YCbCr 4:1:1 format video, the Cb and Cr components are horizontally sub-sampled by a factor of four (each Cb and Cr sample corresponds to four Y components).
	www.faqs.org /rfcs/rfc4175.html (4558 words)

	HDTVoice.com - High-Definition Television Talk - Samsung DVD HD850 HDMI Format???? (Site not responding. Last check: 2007-11-04)
		YCbCr data range of 16-235 (240 for Cb and Cr), where 16 is fl and 235/240 is white.
		YCbCr (4:2:2) is 8-bit and YCbCr (4:4:4) is 10-bit which means there is more information stored to represent the brightness and color values of the pixel and that creates a better looking picture.
		The letters, RGB and YCbCr (or YPbPr), represent the type of data recorded, while the three numbers,4:4:4 and 4:2:2, represent how detailed the data is sampled.
	www.hdtvoice.com /voice/showthread.php?p=120199 (2069 words)

	Determining the best Color Space for compression (Site not responding. Last check: 2007-11-04)
		This experiment also shows that the distorion of YCbCr images is smaller than the visual effect of subsamping in the Lab color space.
		For example in a color space in which the interchannel cross correlation is high, information will be coded redundantly and and this will lead to lower compression ratios.
		Comparisons between YCbCr and other color spaces that take into account these criterions can be found in [3].
	www.stanford.edu /~esetton/experiments2.htm (568 words)

	YCbCr and YPbPr--whats the difference?
		YCbCr is a colour space used in video systems.
		YCbCr signals are created from an original RGB (red, green and blue) source
		YCbCr was defined in the ITU-601 (formerly CCIR-601) standard for use with
	www.dvd-software.info /forums/ftopic11500.html (646 words)

	RGB2YCC
		The color components of RGB pixels in a raw pixmap file may be interleaved or non-interleaved.
		A common compression technique for YCbCr images is to downsample the Cb & Cr component planes.
		converts an RGB face image in a raw pixmap file to the YCbCr colorspace and downsamples the Cb and Cr component planes by a factor of 4 in both dimensions.
	ffpis.sourceforge.net /man/rgb2ycc.html (666 words)

	CIVP (Color Image and Video Processing) Applications - Vector Median Filter
		In this implementation, fast parallel VMF implementation is evaluated in YCbCr color spcace on a 4,096 node SIMD array.
		In this way, VMF can be implemented in YCbCr color space that perfectly separates the intensity and color information and allows more flexible processing of luminance data independent of chrominance.
		Figure 1 shows representations of original tank image, 12% (4% of each R, G, and B) ‘salt and pepper?noise image, and recovered image using VMF in YCbCr color space.
	users.ece.gatech.edu /~jmkim/simpil/c_vmf.html (314 words)

	HDTV Magazine - HDTV Forum - View topic - HDMI - video levels and color space
		YCbCr is based on DVI-video for video content and uses a video, Y, range of 16-235 and a color, Cb and Cr, range of 16-240.
		When HDMI uses the expected YCbCr encoding it must also use the correct color space based on whether the source is HD, ITU Rec.
		In this case the HDMI source is supposed to detect this fact and provide RGB encoding from the native YCbCr that is provided on a DVD movie for DVI since DVI is for the most part RGB for displays.
	www.hdtvmagazine.com /forum/viewtopic.php?t=5317 (871 words)

	rgb2ycbcr(1): convert non-YCbCr TIFF images to ... - Linux man page
		images to YCbCr images by transforming and sampling pixel data.
		If multiple files are specified on the command line each source file is converted to a separate directory in the destination file.
		Set the vertical sampling dimension to one of: 1, 2 (default), or 4.
	www.die.net /doc/linux/man/man1/rgb2ycbcr.1.html (213 words)

	YCbCr 4:2:0 - MultimediaWiki
		YCbCr 4:2:0 indicates a planar YCbCr colorspace where a 2x2 block of pixels in an image is represented by 4 Y samples, 1 for each pixel, but all 4 pixels share a Cb sample and a Cr sample.
		YCbCr 4:2:0 can be transported within a general purpose container format.
		When the data is designated with a FourCC of I420 all of the Y data appears first, followed by the Cb data, then then Cr data.
	wiki.multimedia.cx /index.php?title=YUV_4:2:0 (160 words)

	ColorSpace.str (Version 1.0) (Site not responding. Last check: 2007-11-04)
		Converts a pixel in YCbCr format to a pixel in RGB format according to Recommendation ITU-R BT.
		Converts a pixel in YCbCr format to a pixel in RGB format according to Recommendation ITU-R BT.709 for color space transformations.
		This function's transformation coefficients were calculated using MATLAB and an inverse matrix transform based on the RGB to YCbCr conversion.
	www.cag.lcs.mit.edu /streamit/mpeg/ColorSpace.str.html (219 words)

	YCC2RGB
		The color components of YCbCr pixels in a raw pixmap file may be interleaved or non-interleaved.
		It is possible that the component planes of the input YCbCr image have been previously downsampled.
		converts RGB pixmaps to the YCbCr colorspace, and it conducts downsampling of the resulting YCbCr component planes upon request.
	ffpis.sourceforge.net /man/ycc2rgb.html (747 words)

	ycbcr2rgb :: Functions (Image Processing Toolbox)
		The output image is of the same class as the input image.
		The YUV color space used by many video devices is similar, but not identical, to the YCbCr color space.
		rgb = imread('board.tif'); ycbcr = rgb2ycbcr(rgb); rgb2 = ycbcr2rgb(ycbcr);
	www.mathworks.com /access/helpdesk/help/toolbox/images/ycbcr2rgb.shtml (164 words)

	Color (Image Processing Toolbox) (Site not responding. Last check: 2007-11-04)
		The YCbCr color space is widely used for digital video.
		YCbCr data can be double precision, but the color space is particularly well suited to
		For example, these commands convert the flowers image to YCbCr format.
	www-rohan.sdsu.edu /doc/matlab/toolbox/images/color10.html (137 words)

	YCbCr levels and the Video Mixing Renderer 9 - virtualdub.org (Site not responding. Last check: 2007-11-04)
		The VMR7/9 being referred to are the DirectShow Video Mixing Renderers, which are filters that render final video on the screen in a player like Windows Media Player.
		YCbCr data, which is frequently 8 bits per channel, nominally has a range of 16-235 for the luminance (Y) channel, where 16 represents fl and 235 represents white.
		This is sometimes a point of confusion because JPEG JFIF specifies a slightly different encoding where YCbCr values are encoded with the full 0-255 range; mixing these up causes contrast shifts in the video.
	www.virtualdub.org /blog/pivot/entry.php?id=92 (1870 words)

	COLOR
		TIFFYCbCrToRGBInit() used to initialize YCbCr to RGB conversion state.
		Allocating and freeing of the ycbcr structure belongs to programmer.
		luma is a float array of three values representing proportions of the red, green and blue in luminance, Y (see section 21 of the TIFF 6.0 specification, where the YCbCr images discussed).
	www.math.ucla.edu /computing/docindex/tiff-man-200.html (505 words)

	[Gimp-developer] YCbCr (de)compose support [PATCH] (Site not responding. Last check: 2007-11-04)
		BT.470-2 (== BT.624-4 seems to be == BT.601) and > > YCbCr ITU-R Rec.
		y/cb/cr certainly not (i didnt really think about it, its just edited copyandpaste from the other converters) > I'd > prefer some more descriptive names but I guess it's not that easy > since these conversions are of a very technical nature.
		i changed Y,Cb,Cr to brightness, blueness, redness in the patch on the bug-report, that should be more descriptive [...] Michael
	lists.xcf.berkeley.edu /lists/gimp-developer/2002-October/007526.html (180 words)

	[magick-developers] YCbCr 4:2:2 (fourcc 2yuv) supported? (Site not responding. Last check: 2007-11-04)
		Previous message: [magick-developers] YCbCr 4:2:2 (fourcc 2yuv) supported?
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		This is the format used > > >in the fourcc 2yuv marked avi file.
	www.imagemagick.org /pipermail/magick-developers/2002-April/000471.html (244 words)

	Roxen Community: RFC 4175 RTP Payload Format for Uncompressed Video (Standards Track) (Site not responding. Last check: 2007-11-04)
		When packetizing progressive scan 4:2:0 YCbCr video, samples from two consecutive scan lines are included in each packet.
		The scan line number in the payload header is set to that of the first scan line of the pair:
		Although these positions do not affect the packetization order of chrominance and luminance samples, the information is needed for interpolation prior to display and therefore should be signaled to the receiver.
	community.roxen.com /developers/idocs/rfc/rfc4175.html (4698 words)

	rgb2ycbcr (Image Processing Toolbox) (Site not responding. Last check: 2007-11-04)
		-by-3 matrix that contains the YCbCr luminance (Y) and chrominance (Cb and Cr) color components as columns.
		Each row represents the equivalent color to the corresponding row in the RGB colormap.
		If the input is an RGB image, it can be of class
	www.tau.ac.il /cc/pages/docs/matlab/help/toolbox/images/rgb2ycbcr.html (80 words)

	ycbcr2rgb (Image Processing Toolbox) (Site not responding. Last check: 2007-11-04)
		-by-3 and contains the YCbCr luminance (Y) and chrominance (Cb and Cr) color values as columns, then
		If the input is a YCbCr image, it can be of class
		If the input is a colormap, the input and output colormaps are both of class
	www-rohan.sdsu.edu /doc/matlab/toolbox/images/ycbcr2rgb.html (71 words)

	MATLAB Central - Newsreader - RGB Map and YCbCr images
		MATLAB Central - Newsreader - RGB Map and YCbCr images
		MATLAB Central > comp.soft-sys.matlab > archive > RGB Map and YCbCr images
		E-mail me when replies are made to this thread
	newsreader.mathworks.com /WebX?14@502.CMu0bJAvfLu.0@.ef2076f (265 words)

	YCbCr Visualization [Archive] - PhotoshopTechniques Forums (Site not responding. Last check: 2007-11-04)
		I'd like to visualize the 3 color-components of the YCbCr System (meaning Y = luminance, Cb = Chrominance Blue, Cr = Crominance Red).
		I'm using Photoshop 7.0 and there doesn't seem to be a mode for this.
		A few links said that YCbCr is sometimes confused with YUV, so I imagine that YCbCr looks something like YUV in 3d space.
	www.photoshoptechniques.com /forum/archive/index.php/t-10401.html (166 words)

	Java Advanced Imaging API Download Page
		This is an optional file for use with the ICC-related color classes only.
		Linear Y part of YCbCr for Color Conversion Support
		For comments, suggestions, or questions, please fill out our feedback form.
	java.sun.com /products/java-media/jai/downloads/download-1_1.html (167 words)

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