Y = 0.2990R+0.5870G+0.1140B;
Cb=-0.1687R-0.3313G+0.5000B+128;
Cr= 0.5000R-0.4187G-0.0813B+128;
RGB --> YCbCr
// |Y | |16 | |65.738 129.057 25.06 | |R|
// |Cb| = |128| + (1/256)* |-37.945 -74.494 112.43| *|G|
// |Cr | |128| |112.439 -94.154 -18.28| |B|
Y = 0.256789*R + 0.504129*G + 0.097906*B + 16
Cb = -0.148223*R - 0.290992*G + 0.439215*B + 128
Cr = 0.439215*R - 0.367789*G - 0.071426*B + 128
YCbCr --> RGB
//|R| |298.082 0 408.58 | |Y -16 |
//|G| = (1/256)*|298.082 -100.291 -208.12| * |Cb-128|
//|B| |298.082 516.411 0 | |Cr -128|
R = 1.164383*(y-16) + 0 + 1.596027*(v - 128)
G = 1.164383*(y- 16) - 0.391762*(u - 128) - 0.812969*(v - 128)
B = (1.164383*(y- 16) + 2.017230*(u - 128) + 0
RGB --> gray
Gray = 0.299 * red + 0.587 * green + 0.114 * blue;