/usr/share/radiance/rgb_ycc.cal is in radiance-materials 4R1+20120125-1.
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{
Convert between RGB and YCbCr color spaces
Greg Ward Sept. 2004
}
YCC2R(Y,Cb,Cr) : Y + 1.402*Cr;
YCC2G(Y,Cb,Cr) : Y - 0.34413*Cb - 0.71438*Cr;
YCC2B(Y,Cb,Cr) : Y + 1.772*Cb;
RGB2Y(R,G,B) : 0.299*R + 0.587*G + 0.114*B;
RGB2Cb(R,G,B) : -0.16874*R + -0.33126*G + 0.5*B;
RGB2Cr(R,G,B) : 0.5*R + -0.41869*G + -0.08131*B;
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