// OrderedDither applies a Bayer matrix to dither.
func OrderedDither(img image.Image, palette []color.Color) image.Image {

rImage := image.NewRGBA(img.Bounds())

matrix := [][]float64{
    {0, 4, 1, 5},
    {8, 12, 9, 13},
    {2, 6, 3, 7},
    {10, 6, 11, 15}}

for j := 0; j < img.Bounds().Max.Y; j++ {
    for i := 0; i < img.Bounds().Max.X; i++ {
        m := matrix[i%4][j%4] / 16
        oldPixel, _ := colorful.MakeColor(img.At(i, j))
        oldPixel.R = oldPixel.R*m + oldPixel.R
        oldPixel.G = oldPixel.G*m + oldPixel.G
        oldPixel.B = oldPixel.B*m + oldPixel.B
        newPixel := GetClosestColor(palette, oldPixel)
        r, g, b, _ := newPixel.RGBA()

        rImage.Set(i, j, color.RGBA{R: uint8(r), G: uint8(g), B: uint8(b), A: 255})
    }
}
return rImage