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 There are several different color space systems and notations used to define color video. Video cameras analyze the image to create video signals for the three primary colors: Red, Green, and Blue. They are referred to as “components” of the video signal since each carries part of the information in the image.
A/D Conversion
Video Conversion from analog to digital takes place in three steps:
signal preparation, sampling, and digitizing. By definition, there are two types of component signals: RGB and Y,R-Y,B-Y. R-Y and B-Y are the color difference signals used to carry the color information while Y carries the luminance.
Y’CBCR
Y’CbCr is the color space used for all digital component video formats. Y’ is the luma component and Cb and Cr are the blue and red chroma components. Cb is B-Y and Cr is R-Y. Y’CbCr is not an
absolute color space. It is a way of encoding RGB information. The actual color displayed depends on the actual RGB colorants used to display the image.
YIQ
YIQ is a color space optionally used by the NTSC video system, mainly in North and Central America, and Japan. The Y component represents the black-and-white portion of the signal, whereas the I and Q parts are the color difference components.
YUV
The YUV color model is used by the NTSC and PAL video systems. In the YUV color space model, Y is the luminance component while the U and V are the color difference components. YUV signals are created from an original RGB source. The weighted values of R, G, and B are added together to calculate the Y signal. Color is determined by the chrominance data in U and V. U and V are difference values. They are derived by subtracting the luminance value from the blue and from the red-luminance component. YUV is not an absolute color space.
About the Author:
Mark Pommett produces wedding videos in Los Angeles . He is the founder of Vegas Wedding Videography, a Los Angeles Wedding Videographer studio specializing in beautiful wedding films.
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Analog and Digital Color Space