java 处理图像的明暗度

import java.awt.BorderLayout; import java.awt.Color; import java.awt.Dimension; import java.awt.Font; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.GridLayout; import java.awt.Image; import java.awt.MediaTracker; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.image.BufferedImage; import java.awt.image.LookupOp; import java.awt.image.LookupTable; import java.awt.image.ShortLookupTable; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; public class ImageShading extends JFrame { private JPanel contentPane; private BorderLayout borderLayout1 = new BorderLayout(); // 添加的组件 private JPanel jpanel = new JPanel(); private JButton jb1 = new JButton(); private JButton jb2 = new JButton(); private JButton jb3 = new JButton(); private GridLayout gridLayout = new GridLayout(); // 创建ShowPanel类的实例 ShowPanel sp = new ShowPanel(); public void initial() { // 设置各组件的属性 contentPane = (JPanel) this.getContentPane(); contentPane.setLayout(borderLayout1); this.setSize(new Dimension(580, 440)); this.setTitle("图像的明暗处理演示"); jb1.setFont(new Font("Dialog", Font.BOLD, 13)); jb1.setText("Brighten"); jb1.addActionListener(new ActionListener() {// 添加事件监听器 public void actionPerformed(ActionEvent e) { jb1_actionPerformed(e); } }); jb2.setFont(new Font("Dialog", Font.BOLD, 13)); jb2.setText("Darken"); jb2.addActionListener(new ActionListener() {// 添加事件监听器 public void actionPerformed(ActionEvent e) { jb2_actionPerformed(e); } }); jb3.setFont(new Font("Dialog", Font.BOLD, 13)); jb3.setText("Reset"); jb3.addActionListener(new ActionListener() {// 添加事件监听器 public void actionPerformed(ActionEvent e) { jb3_actionPerformed(e); } }); jpanel.setLayout(gridLayout); jpanel.add(jb1, null); jpanel.add(jb2, null); jpanel.add(jb3, null); contentPane.add(jpanel, BorderLayout.SOUTH); // 在窗口中部添加ShowPanel面板 contentPane.add(sp, BorderLayout.CENTER); this.setVisible(true); } public void jb1_actionPerformed(ActionEvent e) { sp.brightImage();// 创建变亮查找表 sp.applyFilter();// 变亮源图像 sp.repaint();// 绘制变亮后的图像 } public void jb2_actionPerformed(ActionEvent e) { sp.darkImage();// 创建变暗查找表 sp.applyFilter();// 变暗源图像 sp.repaint();// 绘制变暗后的图像 } public void jb3_actionPerformed(ActionEvent e) { sp.reset();// 缓冲区图像为源图像 sp.repaint();// 绘制源图像 } public static void main(String[] args) { new ImageShading().initial(); } } class ShowPanel extends JPanel { private BorderLayout borderLayout = new BorderLayout(); // 定义新属性 Image image;// 源图像 BufferedImage bi;// 缓冲区图像 Graphics2D g2d;// 图像上下文 LookupTable lut;// 查找表 public ShowPanel() { this.setLayout(borderLayout); loadImage();// 加载图片 createBufferedImage();// 创建缓冲区图像 this .setSize(new Dimension(image.getWidth(this), image .getHeight(this)));// 设置面板大小 } public void loadImage() { // 加载图片 image = this.getToolkit().getImage( // 这里如果不填写一个存在的图片，程序会抛出空指针异常 ClassLoader.getSystemResource("hua.jpg"));// 创建Image对象 MediaTracker mt = new MediaTracker(this); mt.addImage(image, 1); try { mt.waitForAll(); } catch (Exception e) { e.printStackTrace();// 表示加载失败 } if (image.getWidth(this) == -1) { System.out.println("不能创建图象");// 如果不存在退出程序 System.exit(-1); } } public void createBufferedImage() { // 根据image对象创建一个缓冲区图像 bi = new BufferedImage(image.getWidth(this), image.getHeight(this), BufferedImage.TYPE_INT_ARGB); // 向缓冲区图像中输入原image对象的图象数据 g2d = bi.createGraphics(); g2d.drawImage(this.image, 0, 0, this);// 绘制缓冲区图像 } public void brightImage() { short[] brighten = new short[256];// 查找表的数据数组 short pixelValue; for (int i = 0; i < 256; i++) { pixelValue = (short) (i + 10);// 加亮源像素10个单位值 if (pixelValue > 255) {// 如果源像素加亮后的值超过255，则设为255 pixelValue = 255; } else if (pixelValue < 0) {// 如果源像素加亮后的值低于0，则设为0 pixelValue = 0; } brighten[i] = pixelValue;// 赋值 } lut = new ShortLookupTable(0, brighten);// 创建新的查找表，该表加亮源图像 } public void darkImage() { short[] darken = new short[256];// 查找表的数据数组 short pixelValue; for (int i = 0; i < 256; i++) { pixelValue = (short) (i - 10);// 变暗源像素10个单位值 if (pixelValue > 255) {// 如果源处理后的像素值超过255，则设为255 pixelValue = 255; } else if (pixelValue < 0) {// 如果处理后的像素值低于0，则设为0 pixelValue = 0; } darken[i] = pixelValue;// 赋值 } lut = new ShortLookupTable(0, darken);// 创建新的查找表，该表变暗源图像 } public void reset() { g2d.setColor(Color.black); g2d.clearRect(0, 0, image.getWidth(this), image.getHeight(this)); g2d.drawImage(this.image, 0, 0, this);// 绘制缓冲区图像 } public void applyFilter() { LookupOp lop = new LookupOp(lut, null);// 根据查找表，创建查找过滤器 lop.filter(bi, bi);// 过滤图像 } public void update(Graphics g) { g.clearRect(0, 0, this.getWidth(), this.getHeight()); paintComponent(g); } public void paintComponent(Graphics g) { super.paintComponent(g); Graphics2D g2 = (Graphics2D) g; g2.drawImage(bi, 0, 0, this); } }