indicates a color difference signal between red (R) and a luminance component, as part of a luminance (Y) and chrominance (C) color model. It has different meanings depending on the exact model used: V in YUV, a generic model used for analog and digital image formats Cr in YCbCr, used for digital images and video Pr in YPbPr, used in analog component video Dr in YDbDr, used in analog SECAM
See also B-Y – The corresponding signal for blue