【java】一些图片印章的处理方法

 

 1 import javax.imageio.ImageIO;
 2 import javax.swing.*;
 3 import java.awt.*;
 4 import java.awt.image.BufferedImage;
 5 import java.io.File;
 6 import java.io.FileInputStream;
 7 import java.io.InputStream;
 8 
 9 public class ImageUtils {
10 
11     /**
12      * 生成缩略图
13      * @param sourcePath
14      * @param outputPath
15      * @param x1
16      * @param y1
17      * @param w
18      * @param h
19      */
20     public static void createThumbnail(String sourcePath, String outputPath, int x1, int y1, int w, int h) {
21         File inputfile = new File(sourcePath);
22         File outfile = new File(outputPath);
23         Thumbnails.of(inputfile).sourceRegion(x1, y1, w, h)
24                 .size(w, h).outputFormat("png").toFile(outfile);
25     }
26 
27     /**
28      * 将图章图片透明化
29      * @param sourcePath
30      * @param outputPath
31      */
32     public static void transparentImage(String sourcePath, String outputPath) {
33         InputStream is = null;
34         try {
35             File file = new File(sourcePath);
36             is = new FileInputStream(file);
37             // 如果是MultipartFile类型，那么自身也有转换成流的方法：is = file.getInputStream();
38             BufferedImage bi = ImageIO.read(is);
39             Image image = (Image) bi;
40             ImageIcon imageIcon = new ImageIcon(image);
41             BufferedImage bufferedImage = new BufferedImage(imageIcon.getIconWidth(), imageIcon.getIconHeight(),
42                     BufferedImage.TYPE_4BYTE_ABGR);
43             Graphics2D g2D = (Graphics2D) bufferedImage.getGraphics();
44             g2D.drawImage(imageIcon.getImage(), 0, 0, imageIcon.getImageObserver());
45             int alpha = 0;
46             for (int j1 = bufferedImage.getMinY(); j1 < bufferedImage.getHeight(); j1++) {
47                 for (int j2 = bufferedImage.getMinX(); j2 < bufferedImage.getWidth(); j2++) {
48                     int rgb = bufferedImage.getRGB(j2, j1);
49                     int R = (rgb & 0xff0000) >> 16;
50                     int G = (rgb & 0xff00) >> 8;
51                     int B = (rgb & 0xff);
52                     if (((255 - R) < 30) && ((255 - G) < 30) && ((255 - B) < 30)) {
53                         rgb = ((alpha + 1) << 24) | (rgb & 0x00ffffff);
54                     }
55                     bufferedImage.setRGB(j2, j1, rgb);
56                 }
57             }
58             g2D.drawImage(bufferedImage, 0, 0, imageIcon.getImageObserver());
59             ImageIO.write(bufferedImage, "png", new File(outputPath));// 直接输出文件
60         } catch (Exception e) {
61             e.printStackTrace();
62         } finally {
63             if (is != null) {
64                 try {
65                     is.close();
66                 } catch (Exception e) {
67                 }
68             }
69         }
70     }
71 }

 

posted @ 2021-05-17 16:20  SpringCore  阅读(808)  评论(0)    收藏  举报