double rec601_625_x_R = 0.640, rec601_625_x_G = 0.290, rec601_625_x_B = 0.150;
double rec601_625_y_R = 0.330, rec601_625_y_G = 0.600, rec601_625_y_B = 0.060;
+// The D65 white point. Given in both Rec. 601 and 709.
double d65_x = 0.3127, d65_y = 0.3290;
ColorSpaceConversionEffect::ColorSpaceConversionEffect()