#include "colorspace_conversion_effect.h"
#include "util.h"
+#include "d65.h"
using namespace Eigen;
static const double rec601_625_x_R = 0.640, rec601_625_x_G = 0.290, rec601_625_x_B = 0.150;
static const 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.
-static const double d65_x = 0.3127, d65_y = 0.3290;
-
ColorspaceConversionEffect::ColorspaceConversionEffect()
: source_space(COLORSPACE_sRGB),
destination_space(COLORSPACE_sRGB)
double z_G = 1.0 - x_G - y_G;
double z_B = 1.0 - x_B - y_B;
- // Find the XYZ coordinates of D65 (white point for both Rec. 601 and 709),
- // normalized so that Y=1.
- Vector3d d65_XYZ(
- d65_x / d65_y,
- 1.0,
- (1.0 - d65_x - d65_y) / d65_y
- );
-
// We have, for each primary (example is with red):
//
// X_R / (X_R + Y_R + Z_R) = x_R
temp(2,1) = z_G / y_G;
temp(2,2) = z_B / y_B;
+ Vector3d d65_XYZ(d65_X, d65_Y, d65_Z);
Vector3d Y_RGB = temp.inverse() * d65_XYZ;
// Now convert xyY -> XYZ.