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4:1:1 In the 4:1:1 sampling format, for every four horizontal Y samples, there is one Cb and Cr value. Therefore, each sample in a 4:2:2 sampling format requires either 16-bits or 20-bits. Each component sample is typically represented as 8-bits or 10-bits. 4:2:2 In the 4:2:2 sampling format, for every two horizontal Y samples, there is one Cb and Cr value. Therefore, each sample in a 4:4:4 sampling format requires either 24-bits or 30 bits. YCbCr Sample Format Description 4:4:4 Each sample has a Y, a Cb, and a Cr value represented typically using 8-bits or 10-bits per component.
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The color information is represented as Cb and Cr with a nominal 8-bit range of 16240 range of values. The luma component Y is defined to have a nominal 8-bit range of 16235 range of values. The YCbCr color space was developed as part of ITU-R VT.601 during the development of a worldwide digital component video standard. One of the common color spaces in this format is the YCbCr color space format. The same can be achieved if the image color properties are stored directly in intensity and color format.ĭue to this reason, many video standards use luma and two color difference signals. For example: to modify the intensity or color of a given pixel, the three RGB values must be read from the frame buffer, the intensity or color calculated, desired modifications performed, new RGB values calculated, and written back into the frame buffer. Processing an image in RGB color space is usually not the most efficient method. So an RGB-based frame buffer must have the same pixel depth and display resolution for each RGB component. However, RGB is not very efficient in terms of bandwidth as all the three components have to be present in equal bandwidth to produce any color.
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Also, the system that is designed using the RGB color space takes advantage of a large number of existing software routines. Therefore, the choice of the RGB color space simplifies the architecture and design of the system. These three colors are used to create any desired color. These are three primary additive colors and are represented by a three-dimensional, Cartesian coordinate system. The red, green, and blue (RGB) color space is widely used in computer graphics. YIQ, YUV, and YCbCr – Used in video compression.A color space is a mathematical representation of a set of colors.