paletted.Pix[i] = uint8(rnd.Intn(256))
	}

	b.SetBytes(640 * 480 * 1)
	b.ReportAllocs()
	b.ResetTimer()
	for i := 0; i < b.N; i++ {
		Encode(io.Discard, paletted, nil)
	}
}

func BenchmarkEncodeRandomRGBA(b *testing.B) {
	rgba := image.NewRGBA(image.Rect(0, 0, 640, 480))
	bo := rgba.Bounds()
	rnd := rand.New(rand.NewSource(123))
	for y := bo.Min.Y; y < bo.Max.Y; y++ {
		for x := bo.Min.X; x < bo.Max.X; x++ {