func BenchmarkCopySrc(b *testing.B) {
	bench(b, color.RGBAModel, color.RGBAModel, nil, Src)
}

func BenchmarkNRGBAOver(b *testing.B) {
	bench(b, color.RGBAModel, color.NRGBAModel, nil, Over)
}

func BenchmarkNRGBASrc(b *testing.B) {
	bench(b, color.RGBAModel, color.NRGBAModel, nil, Src)
}

func BenchmarkYCbCr(b *testing.B) {
	bench(b, color.RGBAModel, color.YCbCrModel, nil, Over)
}