png2jpg.java

import java.awt.*; 
import java.awt.image.BufferedImage;
import javax.imageio.ImageIO;
import java.io.IOException;
/**
 * Converts a png file to a jpg file
 * WARNING: JPG does not support transparency! It will be replaced by white.
 * @param imgName Name of the image file
 */
public void png2jpg(String imgName) {
	String baseName = imgName.substring(0, imgName.lastIndexOf('.'));
	try {
		BufferedImage bufferedImage = ImageIO.read(new File(imgName));
		BufferedImage newBufferedImage = new BufferedImage(bufferedImage.getWidth(),
				bufferedImage.getHeight(), BufferedImage.TYPE_INT_RGB);
		newBufferedImage.createGraphics().drawImage(bufferedImage, 0, 0, Color.WHITE, null);
		// write to jpeg file
		ImageIO.write(newBufferedImage, "jpg", new File(baseName+"_converted.jpg"));
	} catch (IOException e) {
		e.printStackTrace();
	}
}