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diff --git a/apps/plugins/puzzles/icons/crop.sh b/apps/plugins/puzzles/icons/crop.sh
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+++ b/apps/plugins/puzzles/icons/crop.sh
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+#!/bin/sh 
+
+# Crop one image into another, after first checking that the source
+# image has the expected size in pixels.
+#
+# This is used in the Puzzles icon build scripts to construct icons
+# which are zoomed in on a particular sub-area of the puzzle's
+# basic screenshot. This way I can define crop areas in pixels,
+# while not having to worry too much that if I adjust the source
+# puzzle so as to alter the layout the crop area might start
+# hitting the wrong bit of picture. Most layout changes I can
+# conveniently imagine will also alter the overall image size, so
+# this script will give a build error and alert me to the fact that
+# I need to fiddle with the icon makefile.
+
+infile="$1"
+outfile="$2"
+insize="$3"
+crop="$4"
+
+# Special case: if no input size or crop parameter was specified at
+# all, we just copy the input to the output file.
+
+if test $# -lt 3; then
+  cp "$infile" "$outfile"
+  exit 0
+fi
+
+# Check the input image size.
+realsize=`identify -format %wx%h "$infile"`
+if test "x$insize" != "x$realsize"; then
+  echo "crop.sh: '$infile' has wrong initial size: $realsize != $insize" >&2
+  exit 1
+fi
+
+# And crop.
+convert -crop "$crop" "$infile" "$outfile"