printing an image from Processing

ImageToPrinter.pde

import java.io.FileInputStream;
import java.io.IOException;

import javax.print.Doc;
import javax.print.DocFlavor;
import javax.print.DocPrintJob;
import javax.print.PrintException;
import javax.print.PrintService;
import javax.print.PrintServiceLookup;
import javax.print.SimpleDoc;
import javax.print.attribute.HashPrintRequestAttributeSet;
import javax.print.attribute.PrintRequestAttributeSet;
import javax.print.attribute.standard.Copies;

void setup() {
}

void draw() {
}

void mousePressed() {
  try {
    PrintRequestAttributeSet pras = new HashPrintRequestAttributeSet();
    pras.add(new Copies(1));
    PrintService pss[] = PrintServiceLookup.lookupPrintServices(DocFlavor.INPUT_STREAM.GIF, pras);
    if (pss.length == 0)
      throw new RuntimeException("No printer services available.");
    PrintService ps = pss[0];
    System.out.println("Printing to " + ps);
    DocPrintJob job = ps.createPrintJob();
    FileInputStream fin = new FileInputStream(dataPath("file.png"));
    Doc doc = new SimpleDoc(fin, DocFlavor.INPUT_STREAM.GIF, null);
    job.print(doc, pras);
    fin.close();
  } 
  catch (Exception e) {
    e.printStackTrace();
  }
}