Thumbnails: Difference between revisions

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      # Other MimeTypes that include embedded jpeg may work as well (e.g. Nikon .nef, Sony .arf, etc)
      # Test other formats by adding them above
+  ];
+}</syntaxhighlight>
+'''exiv2-thumbnailer'''
+exiv2 can as well generate thumbnails for RAW camera formats by extracting their embedded JPEG or TIFF previews, making thumbnail creation fast without full RAW decoding. It may also support a wider range of RAW formats than gdk‑pixbuf, since it works directly with metadata rather than relying on codec‑level image loaders.<syntaxhighlight lang="nix">
+# configuration.nix
+{ pkgs, ... }:
+{
+  environment.systemPackages = [
+    # exiv2-based RAW thumbnailer (extracts embedded JPEG/TIFF)
+    (pkgs.writeShellApplication {
+      name = "exiv2-thumbnailer";
+      runtimeInputs = [ pkgs.exiv2 pkgs.imagemagick ];
+      text = ''
+        #!${pkgs.bash}/bin/bash
+        set -euo pipefail
+        tmpdir="$(mktemp -d)"
+        trap 'rm -rf "$tmpdir"' EXIT
+        exiv2 -l "$tmpdir" --extract p1 "$1"
+        base="$(basename "$1")"
+        preview="$tmpdir/${base%.*}-preview1.jpg"
+        [ ! -f "$preview" ] && preview="${preview%.*}.tif"
+        magick "$preview" -thumbnail "${3}x${3}>" -strip "png:$2"
+      '';
+    })
+    (pkgs.writeTextFile {
+      name = "exiv2-thumbnailer.thumbnailer";
+      destination = "/share/thumbnailers/exiv2-thumbnailer.thumbnailer";
+      text = ''
+        [Thumbnailer Entry]
+        TryExec=exiv2-thumbnailer
+        Exec=exiv2-thumbnailer %i %o
+        MimeType=image/x-adobe-dng;image/x-sony-arw;image/x-nikon-nef;
+      '';
+    })
    ];
 }
-</syntaxhighlight>
+</syntaxhighlight>For a more complete solution, see the NixOS port of [https://github.com/stackcoder/nixos-nautilus-raw-thumbnails nautilus‑raw‑thumbnails].
 ==== nufraw-thumbnailer ====