{
  stdenv,
  imagemagick,
  src,
}:
stdenv.mkDerivation {
  pname = "blur-image";
  version = "1.0";

  inherit src;

  buildInputs = [ imagemagick ];

  # input is a file, not a directory, skip unpackPhase
  unpackPhase = "true";

  # command taken from: https://old.reddit.com/r/swaywm/comments/oz3t7v/setting_a_blurred_background_with_swaylock_and/
  buildPhase = ''
    magick ${src} -filter Gaussian -resize 20% -blur 0x2.5 -resize 500% output.png
  '';

  installPhase = ''
    mv output.png $out
  '';
}