以编程方式更改 BMP 文件

Posted 2023-02-16

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【中文标题】以编程方式更改 BMP 文件【英文标题】：Programmatically alter a BMP file 【发布时间】：2012-04-11 15:47:37 【问题描述】：

我想加载一个 bmp 文件（在 Java 中）并在 Java 程序的语法中操作图像数据。我怎样才能做到这一点？我尝试只加载图像，如下所示：

   public static void main(String[] args) 
            System.out.println("START");
            loadbitmap lbm = new loadbitmap();
            lbm.loadBMPFile();
            System.out.println("END");
        

        private void loadBMPFile()
        
            
                try

                    FileInputStream fstream = new FileInputStream("sample_fingerprint_grayscale.bmp");
                    DataInputStream in = new DataInputStream(fstream);
                    BufferedReader br = new BufferedReader(new InputStreamReader(in));
                    String inputString;
                    while ((inputString = br.readLine()) != null)   

                        readBMPFile.add(inputString);
                    
                    in.close();
                
                catch (Exception e)
                    System.out.println("IN ERROR");
                    System.err.println("Error: " + e.getMessage());
                
                System.out.println("IN loadBMPFile");
                System.out.println("BMP size is " + readBMPFile.size());
                System.out.println(readBMPFile.get(2));

但是当我检查数据时，它并不真的存在。我是这方面的菜鸟，所以对正确方向的任何点表示赞赏。

这是输出：

START
IN loadBMPFile
BM¸U

(At this point there is a large amount of gibberish characters that won't paste into Stack Overflow)

END

我有一个十六进制阅读器（Frhed），可以将这些字符格式化为十六进制格式，我希望我可以将它们带入一个数组列表并从那里操作它们。

这是十六进制阅读器的输出：

BM<bh:b8>U<bh:01><bh:00><bh:00><bh:00><bh:00><bh:00>6<bh:04><bh:00><bh:00>(<bh:00><bh:00><bh:00><bh:f0><bh:00><bh:00><bh:00><bh:98><bh:fe><bh:ff><bh:ff><bh:01><bh:00><bh:08><bh:00><bh:00><bh:00><bh:00><bh:00><bh:82>Q<bh:01><bh:00><bh:12><bh:0b><bh:00><bh:00><bh:12><bh:0b><bh:00><bh:00><bh:00><bh:00><bh:00><bh:00><bh:00><bh:00><bh:00><bh:00><bh:00><bh:00><bh:00><bh:00><bh:01><bh:01><bh:01><bh:00><bh:02><bh:02><bh:02><bh:00><bh:03><bh:03><bh:03><bh:00><bh:04><bh:04><bh:04><bh:00><bh:05><bh:05><bh:05><bh:00><bh:06><bh:06><bh:06><bh:00><bh:07><bh:07><bh:07><bh:00><bh:08><bh:08><bh:08><bh:00><bh:09><bh:09><bh:09><bh:00>


<bh:00><bh:0b><bh:0b><bh:0b><bh:00><bh:0c><bh:0c><bh:0c><bh:00>


<bh:00><bh:0e><bh:0e><bh:0e><bh:00><bh:0f><bh:0f><bh:0f><bh:00><bh:10><bh:10><bh:10><bh:00><bh:11><bh:11><bh:11><bh:00><bh:12><bh:12><bh:12><bh:00><bh:13><bh:13><bh:13><bh:00><bh:14><bh:14><bh:14><bh:00><bh:15><bh:15><bh:15><bh:00><bh:16><bh:16><bh:16><bh:00><bh:17><bh:17><bh:17><bh:00><bh:18><bh:18><bh:18><bh:00><bh:19><bh:19><bh:19><bh:00><bh:1a><bh:1a><bh:1a><bh:00><bh:1b><bh:1b><bh:1b><bh:00><bh:1c><bh:1c><bh:1c><bh:00><bh:1d><bh:1d><bh:1d><bh:00><bh:1e><bh:1e><bh:1e><bh:00><bh:1f><bh:1f><bh:1f><bh:00>   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【问题讨论】：

您考虑过 BMP 文件的标题吗？而且这不是通过 line s 读取 BMP 的好方法。向我们展示一个示例输出。 @FlopCoder 我已经考虑了标题。我的计划是确定图像数据在文件中的起始位置，然后从数组中的位置对其进行操作。对于您的第二点，我开始明白将 BMP 读入字符串数组可能不是一个好方法。我已经用谷歌搜索了一段时间，但找不到如何读取 BMP 数据，所以我可以更改它。大多数谷歌结果都涉及加载图像以显示，这不是我需要的。感谢您的关注。 @CodeBlue 提供了示例输出。它看起来像是在加载数据，但不是十六进制形式，而是字符形式。 【参考方案1】：

使用javax.imageio.ImageIO。

BufferedImage img = ImageIO.read(new File("... .bmp"));

BufferedImage 也可以修改，非常适合修改。

【讨论】：

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