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YUV color model

The YUV color model is a color model used in the PAL television standard and in image compression. It uses the high bandwidthluminance signal (Y) and the two signals "U" and "V" obtained from the color difference signals B-Y and R-Y.

The U signal is obtained from the B-Y signal by a level reduction by a factor of 0.493 and is limited to 1.3 MHz in video bandwidth. The V signal corresponds to the R-Y signal, but is reduced in level by a factor of 0.877 and is also limited in bandwidth to 1.3 MHz.

This method was developed with the introduction of PAL and is used in PAL video and PAL television. The background is the backward compatibility of color signals for black and white televisions.

Relationship between YUV and red, green and blue

Relationship between YUV and red, green and blue

Therefore, in YUV, the brightness signal (Y) is transmitted with full bandwidth and the two color difference signals defined in two axes are transmitted with much smaller bandwidths. The YUV color model is part of the PAL television standard. There is a direct relationship between the YUV color model and the YPbPr color model via the color difference signals. The Pb signal is approximately 1.15 x the U signal and the Pr color signal is 0.81 x the V signal.

In video compression, the data of the color difference signals U and V can be reduced using color subsampling.

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Englisch: YUV color model
Updated at: 07.04.2010
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