build_source_matrix()

bool fl::colorimetric_response::build_source_matrix ( const float xy_r[2], const float xy_g[2], const float xy_b[2], const float xy_w[2], float M_out[3][3] )

inline

Definition at line 208 of file colorimetric_response.h.

                                                                {
    float xyz_R[3], xyz_G[3], xyz_B[3], xyz_W[3];
    xyY_to_XYZ(xy_r[0], xy_r[1], 1.0f, xyz_R);
    xyY_to_XYZ(xy_g[0], xy_g[1], 1.0f, xyz_G);
    xyY_to_XYZ(xy_b[0], xy_b[1], 1.0f, xyz_B);
    xyY_to_XYZ(xy_w[0], xy_w[1], 1.0f, xyz_W);
 
    float P[3][3];
    P[0][0] = xyz_R[0]; P[0][1] = xyz_G[0]; P[0][2] = xyz_B[0];
    P[1][0] = xyz_R[1]; P[1][1] = xyz_G[1]; P[1][2] = xyz_B[1];
    P[2][0] = xyz_R[2]; P[2][1] = xyz_G[2]; P[2][2] = xyz_B[2];
 
    float P_inv[3][3];
    if (!invert3x3(P, P_inv)) {
        return false;
    }
    float k[3];
    matvec3(P_inv, xyz_W, k);
 
    M_out[0][0] = k[0] * xyz_R[0]; M_out[0][1] = k[1] * xyz_G[0]; M_out[0][2] = k[2] * xyz_B[0];
    M_out[1][0] = k[0] * xyz_R[1]; M_out[1][1] = k[1] * xyz_G[1]; M_out[1][2] = k[2] * xyz_B[1];
    M_out[2][0] = k[0] * xyz_R[2]; M_out[2][1] = k[1] * xyz_G[2]; M_out[2][2] = k[2] * xyz_B[2];
    return true;
}

References fl::FL_NO_EXCEPT, invert3x3(), matvec3(), fl::P(), and xyY_to_XYZ().

Referenced by build_rgb_colorimetric_cache().

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