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Colour space used in the SECAM analog color TV standard From Wikipedia, the free encyclopedia
YDbDr, sometimes written , is the colour space[1] used in the SECAM (adopted in France and some countries of the former Eastern Bloc) analog colour television broadcasting standard.[2][3][4] It is very close to YUV (used on the PAL system) and its related colour spaces such as YIQ (used on the NTSC system), YPbPr and YCbCr.[5][6]
is composed of three components: , and . is the luminance, and are the chrominance components, representing the red and blue colour differences.[7]
The three component signals are created from an original (red, green and blue) source. The weighted values of , and are added together to produce a single signal, representing the overall brightness, or luminance, of that spot. The signal is then created by subtracting the from the blue signal of the original , and then scaling; and by subtracting the from the red, and then scaling by a different factor.
These formulae approximate the conversion between the RGB colour space and .
From RGB to YDbDr:
From YDbDr to RGB:
You may note that the component of is the same as the component of . and are related to the and components of the YUV colour space as follows:
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