Make it easier to diff images.

flutter · Jun 21, 2018 · eb27268 · eb27268
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diff --git a/.gitattributes b/.gitattributes
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+*.png diff=image
diff --git a/README.md b/README.md
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 A repository for golden image files that are used by tests in https://github.com/flutter/flutter.
 
 See: https://github.com/flutter/flutter/wiki/Writing-a-golden-file-test-for-package%3Aflutter
+
+## Getting diffs for golden images
+
+If you have ImageMagick and you want to use it to show diffs of files
+in this repo, add the following to your `~/.gitconfig`:
+
+```
+[diff "image"]
+    command = /path/to/this/repo/diff-images.sh
+```
diff --git a/diff-images.sh b/diff-images.sh
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+#!/bin/sh
+compare $2 $1 png:- | montage -geometry +4+4 $2 - $1 png:- | display -title "$1" -