Hey @kip,

After admiring your work on Image library for a long time, I finally got a chance to use it in my project.

I have a mix task, that compiles the images from assets/images/* directory and puts them into priv/images/* directory.

It creates different variations for input images.

defmodule Mix.Tasks.Images.Compile do
  @moduledoc "Compile all images of projects, inspired by Benjamin Milde's elixir blog."
  @shortdoc "Compiles images"
  use Mix.Task

  @assets_folder "assets/images/"
  @image_sizes [300, 720, 960, 1200, 2000]

  @impl Mix.Task
  def run(_args) do
    src_paths =
      (@assets_folder <> "**/*.{png,webp,jpeg,jpg}")
      |> Path.wildcard()
      |> dbg()

    for src_path <- src_paths, size <- @image_sizes do
      file_name = src_path |> Path.rootname() |> Path.basename()
      ext = src_path |> Path.extname()

      path = src_path |> Path.split() |> Enum.drop(1) |> Path.join()
      dest_dir = "priv/static" |> Path.join(path) |> Path.dirname()
      dest_path = "#{dest_dir}/#{file_name}@#{size}#{ext}"

      {:ok, thumb} = Image.thumbnail(src_path, size)

      File.mkdir_p!(dest_dir)

      Image.write(thumb, dest_path,
        quality: 70,
        strip_metadata: true,
        minimize_file_size: true,
        compression: 6
      )
    end
  end
end

This produces following output: (For PNGs)

image980×705 52.9 KB

However, when I run the same code on WebP, it doesn’t work! Filename, may have changed, but the sizes remain the same.

What is your thoughts on tools like imgproxy?

https://github.com/imgproxy/imgproxy

After resize was done, I was thinking pre-compiling led to unnecessary resizing. For instance for images that are smaller than 500px, was being stretched to 1200px needlessly.

I will have to segregated folders and selectively resize them to different sizes, instead of resizing at runtime like imageproxy does.