Abstract
This chapter draws attention to the concepts of Luma and color differences. It provides detailed information on the B'-Y'. R'-Y' components, the basis for PBPR and CBCR, PBPR components used for analog interface, and CBCR used for digital interface. The chapter explains that if two color difference components having excursions identical to luma are to be formed, then PB and PR color difference components are used. One method of extending the color gamut of an R'G'B' system is to allow components to excurse below zero and above unity. Rec. 1361 is based upon Rec. 709 primaries, but enables the RGB tristimulus components to excurse from -1/4 to +4/3. In discussing conversions between high-definition television (HDTV) and standard-definition television (SDTV), the chapter explains that the differences among the EBU, SMPTE, and Rec. primaries are negligible for practical purposes. New equipment should be designed to Rec. 709. Also, SDTV and HDTV have effectively converged to the transfer function specified in Rec. 709. Consequently, R'G'B' coding uses essentially identical parameters worldwide, for SDTV and HDTV.
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