LumaGreen         240 3rdparty/libtiff/tif_color.c       float f2 = LumaRed*f1/LumaGreen;	int32 D2 = -FIX(f2);
LumaGreen         242 3rdparty/libtiff/tif_color.c       float f4 = LumaBlue*f3/LumaGreen;	int32 D4 = -FIX(f4);