void RGBtoLCH(COLORREF cr, double* L, double* C, double* H);
COLORREF LCHtoRGB(double L, double C, double H);
void RGBtoLAB(COLORREF cr, double* L, double* a, double* b);
COLORREF LABtoRGB(double L, double a, double b);
void RGBtoHSV(COLORREF cr, double* h, double* s, double* v);
COLORREF HSVtoRGB(double h, double s, double v);