本篇文章给大家谈谈java将图片透明,以及生成透明图片对应的知识点,希望对各位有所帮助,不要忘了收藏本站喔。
本文目录一览:
1、java中怎么设背景图片透明2、java将一张png图片中的黑色改为透明?3、java 图片如何让白色变透明
java中怎么设背景图片透明
java不能设背景图片透明,除非连窗体一起透明了。
背景图片透明了,还要背景图片干啥?
还是说背景图片周围有一些不想要的颜色?
这个只能处理图片,把需要的颜色留下,不需要的颜色删除就行了。
java将一张png图片中的黑色改为透明?
1.用 BufferedImage img = new BufferedImage(w,h,BufferedImage.TYPE_INT_ARGB)创建内存图;
2.读入png图片;
3.把所有黑色点的(r,g,b,a)中的a赋值为0。
java 图片如何让白色变透明
代码:
package com.picture;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.regex.Pattern;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JOptionPane;
public class Picture {
public static void convert(String path) {
// TODO Auto-generated constructor stub
try {
BufferedImage image = ImageIO.read(new File(path));
ImageIcon imageIcon = new ImageIcon(image);
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());
int alpha = 0;
for (int j1 = bufferedImage.getMinY(); j1 bufferedImage
.getHeight(); j1++) {
for (int j2 = bufferedImage.getMinX(); j2 bufferedImage
.getWidth(); j2++) {
int rgb = bufferedImage.getRGB(j2, j1);
if (colorInRange(rgb))
alpha = 0;
else
alpha = 255;
rgb = (alpha 24) | (rgb 0x00ffffff);
bufferedImage.setRGB(j2, j1, rgb);
}
}
g2D.drawImage(bufferedImage, 0, 0, imageIcon.getImageObserver());
// 生成图片为PNG
String outFile = path.substring(0, path.lastIndexOf(“.”));
ImageIO.write(bufferedImage, “png”, new File(outFile + “.png”));
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public static boolean colorInRange(int color) {
int red = (color 0xff0000) 16;
int green = (color 0x00ff00) 8;
int blue = (color 0x0000ff);
if (red = color_range green = color_range blue = color_range)
return true;
return false;
}
public static int color_range = 210;
public static Pattern pattern = Pattern.compile(“[0-9]*”);
public static boolean isNo(String str) {
return pattern.matcher(str).matches();
}
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
String path = JOptionPane.showInputDialog(null, “请输入图片目录”);
if (path == null || !new File(path).isDirectory()) {
JOptionPane.showMessageDialog(null, “输入目录有误!”);
return;
}
String color = JOptionPane.showInputDialog(null, “请输入色差范围0~255(建议10~50)”);
if (isNo(color)) {
color_range = 255 – Integer.parseInt(color);
File file = new File(path);
String[] files = file.list();
for (int i = 0; i files.length; i++) {
String ext = files[i].substring(files[i].lastIndexOf(“.”) + 1);
if (ext.equals(“jpg”)) {
convert(path + “//” + files[i]);
}
}
JOptionPane.showMessageDialog(null, “转换完成!”);
} else {
JOptionPane.showMessageDialog(null, “输入的数字有误!”);
}
}
}
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