Attempt at recoloring the background declaratively

hm/style.nix

@@ -11,18 +11,20 @@ let
     { command = "nuit"; polarity = "dark"; }
   ];
   cfg = config.frogeye.desktop.phasesBrightness;
+  bg = builtins.fetchurl {
+    url = "https://get.wallhere.com/photo/sunlight-abstract-minimalism-green-simple-circle-light-leaf-wave-material-line-wing-computer-wallpaper-font-close-up-macro-photography-124350.png";
+    sha256 = "sha256:1zfq3f3v34i45mi72pkfqphm8kbhczsg260xjfl6dbydy91d7y93";
+  };
+  bg_nored = pkgs.runCommand "bg.png" { env.GIMP2_DIRECTORY = "/tmp"; } ''
+    ${pkgs.gimp}/bin/gimp ${bg} --no-interface --no-data --no-fonts bg.png -b "(gimp-levels 2 1 0 255 1 0 0)" -b "(file-png-save-defaults 1 1 2 '$out' '$out')" -b "(gimp-quit 1)"
+  '';
 in
 {
   imports = [ (import stylix).homeManagerModules.stylix ];
 
   stylix = {
     base16Scheme = "${pkgs.base16-schemes}/share/themes/solarized-${polarity}.yaml";
-    image = builtins.fetchurl {
+    image = bg_nored; # The background is set on some occasions, autorandr + feh do the rest
-      url = "https://get.wallhere.com/photo/sunlight-abstract-minimalism-green-simple-circle-light-leaf-wave-material-line-wing-computer-wallpaper-font-close-up-macro-photography-124350.png";
-      sha256 = "sha256:1zfq3f3v34i45mi72pkfqphm8kbhczsg260xjfl6dbydy91d7y93";
-    };
-    # The background is set on some occasions, autorandr + feh do the rest
-
     fonts = {
       monospace = {
         package = pkgs.nerdfonts.override {