Added.

git_diff_image

@@ -0,0 +1,64 @@
+#!/bin/bash
+
+set -eu
+set -o pipefail
+
+name="$1"
+f1="$2"
+f2="$5"
+
+name1="a/$name"
+name2="b/$name"
+
+
+if diff "$f1" "$f2" >/dev/null
+then
+  exit 0
+fi
+
+
+exif() {
+  local b=$(basename "$1")
+  local d=$(mktemp -t "$b")
+  exiftool "$1" | grep -v "File Name" | \
+                  grep -v "Directory" | \
+                  grep -v "File Inode Change" | \
+                  grep -v "File Modification Date/Time" | \
+                  grep -v "File Permissions" \
+     >"$d"
+  echo "$d"
+}
+
+
+diff_clean_names() {
+  diff -u "$1" --label "$name1" "$2" --label "$name2" || true
+}
+
+
+if which -s exiftool
+then
+  d1=$(exif "$f1")
+  d2=$(exif "$f2")
+  diff_clean_names "$d1" "$d2"
+else
+  diff_clean_names "$f1" "$f2"
+fi
+
+if [ -z "${GIT_DIFF_IMAGE_ENABLED-}" ] || \
+   ! which -s compare || \
+   ! which -s montage
+then
+  exit 0
+fi
+
+if compare "$f1" "$f2" /dev/null
+then
+  exit 0
+fi
+
+bn=$(basename "$f1")
+destfile=$(mktemp -t "$bn").png
+
+compare "$f1" "$f2" png:- | \
+  montage -geometry +4+4 "$f1" - "$f2" png:- >"$destfile" 2>/dev/null || true
+open "$destfile"