将白色背景图片变透明

来源：互联网发布：中建七局华北公司知乎编辑：程序博客网时间：2024/05/17 08:12

--非常牛：

package test;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 stubtry {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;elsealpha = 255;rgb = (alpha << 24) | (rgb & 0x00ffffff);bufferedImage.setRGB(j2, j1, rgb);}}g2D.drawImage(bufferedImage, 0, 0, imageIcon.getImageObserver());// 生成图片为PNGString outFile = path.substring(0, path.lastIndexOf("."));ImageIO.write(bufferedImage, "png", new File(outFile + ".png"));} catch (IOException e) {// TODO Auto-generated catch blocke.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 stubString 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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