import java.awt.image.BufferedImage;
import java.awt.Image;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import javax.imageio.IIOImage;
import javax.imageio.ImageIO;
import javax.imageio.ImageReader;
import javax.imageio.ImageWriter;
import javax.imageio.stream.ImageInputStream;
import javax.imageio.stream.ImageOutputStream;

public class ImageWriterTest1 {
    public ImageWriterTest1() {}

    public ImageWriterTest1(String sourceFile, String destinationFile) {
        BufferedImage image = readImage(sourceFile);
        writeImage(image, destinationFile);
    }

    protected BufferedImage readImage(String filename) {
        Iterator readers = ImageIO.getImageReadersBySuffix(getSuffix(filename));
        
        if (readers.hasNext()) {
            ImageReader reader = (ImageReader)readers.next();
            
            try {
                ImageInputStream stream = ImageIO.createImageInputStream(new File(filename));
                reader.setInput(stream, true);

                return reader.read(0);
            } catch (IOException ex) {
                ex.printStackTrace();
            }
        }

        return null;
    }

    protected void writeImage(BufferedImage image, String filename) {
        Iterator writers = ImageIO.getImageWritersByFormatName(getSuffix(filename));
        
        if (writers.hasNext()) {
            ImageWriter writer = (ImageWriter)writers.next();

            try {
                ImageOutputStream stream = ImageIO.createImageOutputStream(new File(filename));
                writer.setOutput(stream);

                writer.write(image);
                writer.dispose();

                return;
            } catch (IOException ex) {
                ex.printStackTrace();
            }
        }
    }
    
    protected String getSuffix(String filename) {
        int i = filename.lastIndexOf('.');
        if(i>0 && i<filename.length()-1) {
            return filename.substring(i+1).toLowerCase();
        };
        
        return "";
    }

    public static void main(String[] args) {
        if (args.length == 2) {
            new ImageWriterTest1(args[0], args[1]);
        } else {
            System.out.println("Usage: java ImageWriterTest1 <source filename> <destination filename>");
        }
    }
}