Source Code : how to convert png to pgm image?

how to convert png to pgm image?

i have created an image using java. it is in png format but i would like it to be in pgm format. anyone can help to edit my code (which fails to run)? thanks!

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01import java.awt.image.BufferedImage;

02import java.io.File;

03import javax.imageio.ImageIO;

04import java.io.ByteArrayOutputStream;

05

06public class example {

07public static void main(String[] argv) throws Exception {

08BufferedImage bufferedImage = ImageIO.read(new File("C:\\Documents and Settings\\home user\\Desktop\\test6\\image.png"));

09

10ImageIO.write(bufferedImage, "pgm", new File("C:\\Documents and Settings\\home user\\Desktop\\test6\\image.pgm"));

11}

12}