Ensure IO is properly closed

gistfile1.scala

def convert(command: String, fileIn: String, fileOut: String): Unit = {
  val input = new FileInputStream(fileIn)
  val output = new FileOutputStream(fileOut)
  val converter = new MagickConverter("(no name)", command)
  try {
    converter.process(input, output)
  } finally {
    input.close()
    output.close()
  }
}