typedef Color_traits<Color_def<Pixel_traits<2>, 0,5,5,6,11,5> > Bgr16;
typedef Color_traits<Color_def<Pixel_traits<3>, 16,8,8,8,0,8> > Rgb24;
typedef Color_traits<Color_def<Pixel_traits<4>, 16,8,8,8,0,8> > Rgb32;
+typedef Color_traits<Color_def<Pixel_traits<4>, 0,8,8,8,16,8> > Bgr32;
typedef Color_traits<Color_def<Pixel_traits<4>, 16,8,8,8,0,8,24,8> > Rgba32;
}