Ive got this snippet that Im using to convert image files to tiff. I want to be informed when a file fails to convert. Imagemagick exits 0 when successfully run, so I figured the following snippet would report the issue. However no errors are being reported at all.

def image(filePath,dirPath,fileUUID,shortFile):
  try:
    os.system("convert " + filePath + " +compress " + dirPath + "/" + shortFile + ".tif")
  except OSError, e:
    print >>sys.stderr, "image conversion failed: %s" % (e.errno, e.strerror)
    sys.exit(-1)