-#!/bin/sh
-# this is the default converter if no one other was
-# defined by the user in edit->preferences->converter
-#
-# the user can also redefine this default converter
-# with an own shell script in ~/.lyx/scripts
-#
-# converts an image from $1 to $2 format
-convert -depth 8 $1 $2
-exit 0
+#! /bin/sh
+
+# file convertDefault.sh
+# This file is part of LyX, the document processor.
+# Licence details can be found in the file COPYING.
+
+# author Herbert Voß
+
+# Full author contact details are available in file CREDITS.
+
+# The default converter if no other has been defined by the user from the
+# Conversion->Converter tab of the Preferences dialog.
+
+# The user can also redefine this default converter, placing their
+# replacement in ~/.lyx/scripts
+
+# converts an image from $1 to $2 format
+convert -depth 8 "$1" "$2" || {
+ echo "$0 ERROR" >&2
+ echo "Execution of \"convert\" failed." >&2
+ exit 1
+}