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目录Java png图片修改像素rgba值ARGB与RGB、RGBA的区别Java png图片修改像素rgba值 import javax.imageio.ImageIO; i
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
public class ReadColorTest {
public static void setAlpha(String os) {
try {
ImageIcon imageIcon = new ImageIcon(os);
BufferedImage bufferedImage = new BufferedImage(imageIcon.getIconWidth(),imageIcon.getIconHeight()
, BufferedImage.TYPE_4BYTE_ABGR);
Graphics2D g2D = (Graphics2D) bufferedImage.getGraphics();
g2D.drawImage(imageIcon.getImage(), 0, 0,imageIcon.getImageObserver());
for (int j1 = bufferedImage.getMinY(); j1 < bufferedImage.getHeight(); j1++) {
for (int j2 = bufferedImage.getMinX(); j2 < bufferedImage.getWidth(); j2++) {
int pixel = bufferedImage.getRGB(j2, j1);//j2横坐标,j1竖坐标
int[] rgb = new int[3];
rgb[0] = (pixel & 0x00ff0000) >> 16;//按位与获取red然后右移
rgb[1] = (pixel & 0x0000ff00) >> 8;//..获取green...
rgb[2] = (pixel & 0x000000ff);
int a=(pixel & 0xff000000)>>>24;//无符号右移获取alpha值
if(comp(rgb[0],rgb[1],rgb[2])||a==0) {
pixel = pixel | 0xffffffff;//透明或偏向白色射为白色
}else {
pixel = (pixel & 0xff000000)| 0xff000000;//否则为黑色
}
bufferedImage.setRGB(j2, j1, pixel);
}
System.out.println();
}
g2D.drawImage(bufferedImage, 0, 0, imageIcon.getImageObserver());
ImageIO.write(bufferedImage, "png", new File("D:\\2.png"));
}
catch (Exception e) {
e.printStackTrace();
}
}
public static boolean comp(int r,int g,int b) {//判断二值化为黑还是白,true为白,false为黑
int i = 0;
if(r>200) {
i++;
}
if(g>200) {
i++;
}
if(b>200) {
i++;
}
if(i>=2) {
return true;
}else {
return false;
}
}
public static void main(String[] args) throws Exception {
setAlpha("H:\\Test\\3.png");
}
}
PNG是一种使用RGBA的图像格式。
以上为个人经验,希望能给大家一个参考,也希望大家多多支持编程网。
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本文标题: Java png图片修改像素rgba值的操作
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