import java.awt.Dimension;
import java.awt.Image;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.Iterator;
import javax.imageio.IIOParamController;
import javax.imageio.ImageIO;
import javax.imageio.ImageReader;
import javax.imageio.ImageReadParam;
import javax.imageio.ImageTypeSpecifier;
import javax.imageio.stream.ImageInputStream;

public class ImageReaderTest3 extends ImageReaderTest1 {
    public ImageReaderTest3(String filename) {
        super(filename);
    }

    protected Image 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);

                ImageReadParam param = reader.getDefaultReadParam();

                param.setSourceRegion(new Rectangle(200, 200, 400, 400));
                param.setDestinationOffset(new Point(50, 0));
                param.setSourceSubsampling(4, 2, 2, 1);
                
                Image image = reader.read(0, param);
                reader.dispose();

                return image;
            } catch (IOException ex) {
                ex.printStackTrace();
            }
        }

        return null;
    }
    
    public static void main(String[] args) {
        if (args.length == 1) {
            new ImageReaderTest3(args[0]);
        } else {
            System.out.println("Usage: java ImageReaderTest3 <filename>");
        }
    }
}