LumaRed           239 3rdparty/libtiff/tif_color.c     { float f1 = 2-2*LumaRed;		int32 D1 = FIX(f1);
LumaRed           240 3rdparty/libtiff/tif_color.c       float f2 = LumaRed*f1/LumaGreen;	int32 D2 = -FIX(f2);