1、实现抽象类AbstractBufferedImageOp ——————读取和写入像素数据操作

package chapter4;

import java.awt.image.BufferedImage;

public class AbstractBufferedImageOp {

//读取像素数据
public int[] getRGB(BufferedImage image,int x, int y, int width, int height,int[] pixels){
int type = image.getType();
if(type == BufferedImage.TYPE_INT_ARGB || type == BufferedImage.TYPE_INT_RGB){
return (int[]) image.getRaster().getDataElements(x,y,width,height,pixels);
}else{
return image.getRGB(x,y,width,height,pixels,0,width);
}
}
//写入像素数据
public void setRGB(BufferedImage image,int x, int y, int width, int height, int[] pixels){
int type =image.getType();
if(type == BufferedImage.TYPE_INT_ARGB || type == BufferedImage.TYPE_INT_RGB){
image.getRaster().setDataElements(x,y,width,height,pixels);
}else {
image.setRGB(x,y,width,height,pixels,0,width);
}
}
public BufferedImage creatCompatibleDestImage(BufferedImage src,BufferedImage dest){

return new BufferedImage(src.getWidth(),src.getHeight(),BufferedImage.TYPE_INT_RGB);
}
}

2、实现照片泛黄代码————SepiaToneFilter类

package chapter4;

import java.awt.image.BufferedImage;

public class SepiaToneFilter extends AbstractBufferedImageOp{
public BufferedImage filter(BufferedImage src, BufferedImage dest){
int width = src.getWidth();
int height = src.getHeight();

if(dest == null){
dest = creatCompatibleDestImage(src,null);
}
int[] inpixels = new int[width*height];
int[] outpixels = new int[width*height];
getRGB(src,0,0,width,height,inpixels);
int index = 0;
for(int row=0;row<height;row++){
int ta=0, tr=0, tg=0,tb=0;
for(int col=0;col<width;col++){
index = row*width+col;
ta = (inpixels[index] >> 24) & 0xff;
tr = (inpixels[index] >> 16) & 0xff;
tg = (inpixels[index] >> 8) & 0xff;
tb = (inpixels[index]) & 0xff;

int fr = (int) colorBlend(noise(),(tr*0.393)+(tg*0.769)+(tb*0.189),tr);
int fg = (int) colorBlend(noise(),(tr*0.349)+(tg*0.686)+(tb*0.189),tg);
int fb = (int) colorBlend(noise(),(tr*0.272)+(tg*0.534)+(tb*0.131),tb);

outpixels[index] = (ta<<24) | clamp(fr) << 16 | clamp(fg) << 8 | clamp(fb);
}
}
setRGB(dest,0,0,width,height,outpixels);
return dest;
}
//设置权重系数
public double noise(){
return Math.random()*0.5+0.5;
}
//计算新的像素值=新的像素值+原来像素值-原来像素值*权重系数
public double colorBlend(double scale, double dest, double src){
return (scale*dest+(1-scale)*src);
}
/* c<0 0
c>255 255
* 0<c<255 c
* */
public static int clamp(int c){
return c>255 ? 255:((c<0) ? 0:c);
}
public String toString(){
return "Sepia Tone Effect - Effect from Photoshop App";
}
}

3、在ImagePanel类上加入滤镜操作

package chapter4;

import javax.swing.*;
import java.awt.*;
import java.awt.image.BufferedImage;

public class ImageJPanel extends JPanel {
private static final long serialVersionUID = 1L;
private BufferedImage sourceImage;
private BufferedImage destImage;

public ImageJPanel(){}
public BufferedImage getSourceImage() {
return sourceImage;
}

public void setSourceImage(BufferedImage sourceImage) {
this.sourceImage = sourceImage;
}

public BufferedImage getDestImage() {
return destImage;
}

public void setDestImage(BufferedImage destImage) {
this.destImage = destImage;
}

public void process(){
SepiaToneFilter filter = new SepiaToneFilter();
destImage = filter.filter(sourceImage,null);
}

public void paintComponent(Graphics g){
Graphics2D g2d = (Graphics2D) g.create();
g2d.clearRect(0,0,this.getWidth(),this.getHeight());

if(sourceImage != null){
g2d.drawImage(sourceImage,0,0,sourceImage.getWidth(),sourceImage.getHeight(),null);
if(destImage != null){
g2d.drawImage(destImage,sourceImage.getWidth()+10,0,destImage.getWidth(),destImage.getHeight(),null);
}
}

}

}

4、在UI_MainUI类中运行

package chapter4;

import javax.imageio.ImageIO;
import javax.swing.*;
import javax.swing.filechooser.FileNameExtensionFilter;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

/**
* Created by LENOVO on 18-1-29.
*/
public class UI_MainUI extends JFrame implements ActionListener{
private static final long serialVersionUID = 1L;
private static final String IMG_CMD = "选择图像...";
private static final String PROCESS_CMD = "处理";

private JButton imgBtn;
private JButton processBtn;
private ImageJPanel imageJPanel;

private BufferedImage srcImage;
public UI_MainUI(){
setTitle("JFrame UI —演示");
imgBtn = new JButton(IMG_CMD);
processBtn = new JButton(PROCESS_CMD);

JPanel btnJpanel = new JPanel();
btnJpanel.setLayout(new FlowLayout(FlowLayout.RIGHT));
btnJpanel.add(imgBtn);
btnJpanel.add(processBtn);

imageJPanel = new ImageJPanel();
getContentPane().setLayout(new BorderLayout());
getContentPane().add(imageJPanel,BorderLayout.CENTER);
getContentPane().add(btnJpanel,BorderLayout.SOUTH);

setupActionListener();

}

public void setupActionListener(){
imgBtn.addActionListener(this);
processBtn.addActionListener(this);
}

@Override
public void actionPerformed(ActionEvent e) {
if(SwingUtilities.isEventDispatchThread()){
System.out.println("Event Dispatch Thred!!");
}
if(srcImage == null){

try {
JOptionPane.showMessageDialog(this,"请先选择图像源文件");
JFileChooser chooser = new JFileChooser();
chooser.showOpenDialog(null);
setFileTypeFilter(chooser);
File f = chooser.getSelectedFile();
if(f != null){
srcImage = ImageIO.read(f);
imageJPanel.setSourceImage(srcImage);//图像面板添加图像
imageJPanel.repaint();
}
} catch (IOException e1) {
e1.printStackTrace();
}
return ;
}
if (IMG_CMD.equals(e.getActionCommand())){
if(srcImage == null){

try {
JOptionPane.showMessageDialog(this,"请先选择图像源文件");
JFileChooser chooser = new JFileChooser();
chooser.showOpenDialog(null);
File f = chooser.getSelectedFile();
if(f != null){
srcImage = ImageIO.read(f);
imageJPanel.setSourceImage(srcImage);//图像面板添加图像
imageJPanel.repaint();
}
} catch (IOException e1) {
e1.printStackTrace();
}
}
}else if(PROCESS_CMD.equals(e.getActionCommand())){
imageJPanel.process();
imageJPanel.repaint();
}
}
public void setFileTypeFilter(JFileChooser chooser){
FileNameExtensionFilter filter = new FileNameExtensionFilter("JPG & PNG Images","jpg","png");
chooser.setFileFilter(filter);
}
public void openView(){
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setPreferredSize(new Dimension(800,600));
pack();
setVisible(true);
}
public static void main(String args[]){
UI_MainUI ui = new UI_MainUI();
ui.openView();
}
}