LumaBlue          241 3rdparty/libtiff/tif_color.c       float f3 = 2-2*LumaBlue;		int32 D3 = FIX(f3);
LumaBlue          242 3rdparty/libtiff/tif_color.c       float f4 = LumaBlue*f3/LumaGreen;	int32 D4 = -FIX(f4);