| | Definition: | | Kodak's PhotoYCC colour space (for PhotoCD) is similar to YCbCr, except that Y is coded with lots of headroom and no footroom, and the scaling of Cb and Cr is different from that of Rec. 601-1 in order to accommodate a wider colour gamut:
Y_8bit = (255/1.402) * Y
C1_8bit = 156 + 111.40 * (Bgamma - Y)
C2_8bit = 137 + 135.64 * (Rgamma - Y)
The C1 and C2 components are subsequently subsampled by factors of two horizontally and vertically, but that subsampling should be considered a feature of the compression process and not of the colour space. |
Video Dictionary