引言: 請問要如何讀取圖片裡的所有像素？會不會是將圖片放入由ImageIcon宣告的變數裡面，再用別的方式將圖片換成像素來顯示呢？

import java.awt.*;
import java.awt.image.*;
import javax.swing.*;    public class GrayImage extends JFrame
{ JLabel view = new JLabel("");
  public GrayImage()
  { super("Test ImageIcon");
    getContentPane().add(view);
    toGray("lena.jpg");  // give the filename you want to process.
    pack();
    setVisible(true);
    show();        addWindowListener ( new java.awt.event.WindowAdapter () {
        public void windowClosing (java.awt.event.WindowEvent evt) {
          System.exit(0);
        }
      }
    );
  }      public void toGray(String fname)
  { ImageIcon imgIcon = new ImageIcon(fname);        BufferedImage image = new BufferedImage(
                            imgIcon.getIconWidth(), imgIcon.getIconHeight(),
                            BufferedImage.TYPE_INT_ARGB
                        );
    Graphics2D g2d = (Graphics2D) image.createGraphics();
    g2d.drawImage(imgIcon.getImage(), 0,0, null);
    imgIcon = null;
    g2d.dispose();        WritableRaster raster = image.getRaster();        int value, r, g, b, gray;        for (int y=0; y