-#!/bin/bash
-# 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"
+ echo "Execution of \"convert\" failed."
+ exit 1
+}
+
+# It appears that convert succeeded, but we know better than to trust it ;-)
+# convert is passed strings in the form "FMT:FILENAME", so use the ':' to
+# delimit the two parts.
+# Note that Win32 filenames have the form 'C:\my\file',
+# so use everything from the first ':' to the end of the line.
+FILE=`echo "$2" | cut -d ':' -f 2-`
+
+test -f "$FILE" || {
+ echo "$0 ERROR"
+ echo "Unable to find file \"${FILE}\""
+ exit 1
+}
+
+echo "$0 generated file \"${FILE}\" successfully."