Reduce colors

Mix.install(
  [
    {:image, "~> 0.52"},
    {:kino, "~> 0.14"},
    {:scholar, "~> 0.3"},
    {:exla, "~> 0.8"}
  ],
  config: [
    nx: [
      default_backend: EXLA.Backend,
      default_defn_options: [compiler: EXLA]
    ]
  ]
)

Prepare image

{puppies_img, _} =
  "/home/livebook/vix/puppies.png"
  |> Image.open!()
  |> Image.split_alpha()

puppies_img

Reduce colors

Image.k_means!(puppies_img)

Image.k_means!(puppies_img, num_clusters: 8)
|> Enum.map(fn color ->
  Image.new!(100, 100, color: color)
end)
|> Kino.Layout.grid(columns: 8)

Image.reduce_colors!(puppies_img)

[
  puppies_img,
  Image.reduce_colors!(puppies_img, colors: 10),
  Image.reduce_colors!(puppies_img, colors: 8),
  Image.reduce_colors!(puppies_img, colors: 6),
  Image.reduce_colors!(puppies_img, colors: 4),
  Image.reduce_colors!(puppies_img, colors: 2)
]
|> Kino.Layout.grid(columns: 3)