+import os, re, sys
+
+# We may need some extra options only supported by recent convert versions
+re_version = re.compile(r'^Version:.*ImageMagick\s*(\d*)\.(\d*)\.(\d*).*$')
+fout = os.popen('convert -version 2>&1')
+output = fout.readline()
+fout.close()
+version = re_version.match(output)
+
+# Imagemagick by default
+gm = 0
+
+if version != None:
+ major = int(version.group(1))
+ minor = int(version.group(2))
+ patch = int(version.group(3))
+ version = hex(major * 65536 + minor * 256 + patch)
+else:
+ # Try GraphicsMagick
+ re_version = re.compile(r'^GraphicsMagick.*http:..www.GraphicsMagick.org.*$')
+ version = re_version.match(output)
+ if version != None:
+ gm = 1
+
+opts = "-depth 8"
+
+# If supported, add the -define option for pdf source formats
+if sys.argv[1][:4] == 'pdf:' and (version >= 0x060206 or gm):
+ opts = '-define pdf:use-cropbox=true ' + opts
+
+# If supported, add the -flatten option for ppm target formats (see bug 4749)
+if sys.argv[2][:4] == 'ppm:' and (version >= 0x060305 or gm):
+ opts = opts + ' -flatten'
+
+if os.system(r'convert %s "%s" "%s"' % (opts, sys.argv[1], sys.argv[2])) != 0: