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The scope of the terms Y′UV, YUV, YCbCr, YPbPr, etc., is sometimes ambiguous and overlapping. Y′UV is the separation used in PAL. YDbDr is the format used in SECAM and PAL-N, unusually based on non-gamma-corrected (linear) RGB, making the Y component true luminance. Y′IQ is the format used in NTSC television.
RGB files are typically encoded in 8, 12, 16 or 24 bits per pixel. In these examples, we will assume 24 bits per pixel, which is written as RGB888. The standard byte format is simply r0, g0, b0, r1, g1, b1, .... YCbCr Packed pixel formats are often referred to as "YUV". Such files can be encoded in 12, 16 or 24 bits per pixel.
In YUV systems, since U and V both contain information in the orange-blue range, both components must be given the same amount of bandwidth as I to achieve similar color fidelity. Very few television sets perform true I and Q decoding, due to the high costs of such an implementation.
AviSynth filters work in many RGB and YUV color spaces to allow all kinds of video input and output. [8] Certain functions only work on specific color spaces, requiring conversion – for example, most videos are distributed in a YUV color space, but most color correction is done in one of the RGB spaces. A color-correcting script might look ...
The practical result of these different gamma values per color channel is that what looks clean and neutral on a YUV screen looks like it has a slight pink tint on an RGB screen if no proper YUV --> RGB conversion is applied. The complimentary case is where unconverted RGB footage is shown on a YUV monitor and turns out slightly greenish.
Judd was the first to employ this type of transformation, and many others were to follow. Converting this RGB space to chromaticities one finds [4] [clarification needed The following formulae do not agree with u=R/(R+G+B) and v=G/(R+G+B)] Judd's UCS, with the Planckian locus and the isotherms from 1,000K to 10,000K, perpendicular to the locus.
Initially, 4:1:1 chroma subsampling of the DV format was not considered to be broadcast quality and was only acceptable for low-end and consumer applications. [ 3 ] [ 4 ] However, DV -based formats (some of which use 4:1:1 chroma subsampling) have been used professionally in electronic news gathering and in playout servers.
Hexadecimal 8-bit RGB representations of the main 125 colors. A color in the RGB color model is described by indicating how much of each of the red, green, and blue is included. The color is expressed as an RGB triplet (r,g,b), each component of which can vary from zero to a defined maximum value. If all the components are at zero the result is ...