The YPbPr color model is mainly used in the analog transmission of video signals from digital YCbCr color-coded sources like DVD or DVB, which is usually done via component video connection. It was originally specified and used briefly for analog HDTV.
YPbPr is often mistakenly referred to as YUV, also in manuals and case labels from the equipment manufacturer. In YUV, although it is to a related analog, but based on other conversion formulas color model. Contrary to widespread assumption is not used in YUV component video connections, but only the analogue PAL television ( Terrestrial, satellite and cable) and in the PAL transfer via composite video or S-Video.
Since the YPbPr signal the Helligkeits-/Luminanz-Information Y and the two Farbdifferenz-/Chrominanz-Informationen Pb and Pr transfers separately, no modulation or quadrature amplitude modulation is necessary. Characterized YPbPr provides a better image than the dye image- blanking - sync, or the composite video signal is Y / C and S-video.
YPbPr is - as its digital counterpart YCbCr - as one possible implementation of the ITU- R BT 601 ( formerly CCIR 601) described. There are also different implementations of it, the other standards with other calculation coefficients follow.
Calculation of YPbPr values from the gamma-corrected (ie linear in brightness ) color triplets R'G'B ':
Calculation of R'G'B values from YPbPr values :
The matrices are for the constants KB and KR from ITU -R BT 601:
Expressed by the constants formulas for conversion to Y'PbPr loud in general:
And for conversion to R'G'B ':