测试 

 1 public static void create_4bit(File file) throws IOException {
 2 
 3         if (!file.exists()) {
 4             System.err.println("文件不存在！" + file.getAbsolutePath());
 5             return;
 6         }
 7         
 8         int width = (int) Math.ceil(Math.sqrt(file.length() * 2));
 9         width = width % 2 == 0 ? width : width + 1;//宽度必须为偶数，读取的时候是成对读取的，2个像素为1个字节数据
10         int height = (int) Math.ceil((double) file.length() / (double) (width / 2));
11         System.out.println(width + " " + height);
12 
13         BufferedImage buffer = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
14         FileInputStream fis = new FileInputStream(file);
15 
16         byte[] b = new byte[1024];
17         int s, count = 0, x = 0, y = 0;
18 
19         while ((s = fis.read(b)) != -1) {
20             for (int i = 0; i < s; i++) {
21 
22                 String hex = String.format("%02X", b[i]);
23                 Color rgb = ColorTable.HEX_VALUES_4BIT[Integer.parseInt(hex.substring(0, 1), 16)];
24                 buffer.setRGB(x, y, rgb.getRGB());
25                 rgb = ColorTable.HEX_VALUES_4BIT[Integer.parseInt(hex.substring(1, 2), 16)];
26                 buffer.setRGB(x + 1, y, rgb.getRGB());
27                 count++;
28                 x += 2;
29                 if (count % (width / 2) == 0) {
30                     x = 0;
31                     y++;
32                 }
33             }
34         }
35         System.out.println(y);
36         fis.close();
37         if (!ImageIO.write(buffer, "png", new File("2.png")))
38             System.err.println("执行失败！");
39     }

测试

posted @ 2020-07-05 10:42  zzj6  阅读(110)  评论(0)    收藏  举报