This one of the developments of NTSC component coding, in which the B primary and white point were changed. The CRT gamma law is assumed to be 2.2. The white point is D65, chromaticity coordinates are:
R: xr=0.67 yr=0.33
G: xg=0.21 yg=0.71
B: xb=0.15 yb=0.06
White: xn=0.312713 yn=0.329016
The conversion equations for linear signals are:
X = 0.567*R + 0.190*G + 0.193*B
Y = 0.279*R + 0.643*G + 0.077*B
Z = 0.000*R + 0.073*G + 1.016*B
R = 2.042*X - 0.565*Y - 0.345*Z
G =-0.894*X + 1.815*Y + 0.032*Z
B = 0.064*X - 0.129*Y + 0.912*Z
The coding equations for non-linear signals are:
Y'= 0.2122*R' + 0.7013*G' + 0.0865*B' Pb=-0.1162*R' - 0.3838*G' + 0.5000*B' Pr= 0.5000*R' - 0.4451*G' - 0.0549*B'
R'= Y + 0.0000*Pb + 1.5756*Pr G'= Y - 0.2253*Pb + 0.5000*Pr B'= Y + 1.8270*Pb + 0.0000*Pr
The conversion equations relating SMPTE 240 RGB to EBU and 709 primaries are:
R240= 0.7466*Re + 0.2534*Ge + 0.0000*Be
G240= 0.0187*Re + 0..9813*Ge + 0.0000*Be
B240= 0.0185*Re + 0.0575*Ge + 0.9240*Be
Re= 1.3481*R240 - 0.3481*G240 + 0.0000*B240
Ge=-0.0257*R240 + 1.0257*G240 + 0.0000*B240
Be=-0.0254*R240 - 0.0568*G240 + 1.0822*B240
and:
R240= 0.7151*R709 + 0.2849*G709 + 0.0000*B709
G240= 0.0179*R709 + 0.9821*G709 + 0.0000*B709
B240= 0.0177*R709 + 0.0472*G709 + 0.9350*B709
R709= 1.4086*R240 - 0.4086*G240 + 0.0000*B240
G709=-0.0257*R240 + 1.0457*G240 + 0.0000*B240
B709=-0.0254*R240 - 0.0440*G240 + 1.0695*B240