color

var (
	BGRModel = color.ModelFunc(func(c color.Color) color.Color {
		if y, ok := c.(color.YCbCr); ok {
			r, g, b := color.YCbCrToRGB(y.Y, y.Cb, y.Cr)
			return BGR{b, g, r}
		}
		r, g, b, _ := c.RGBA()
		return BGR{uint8(b), uint8(g), uint8(r)}
	})
)