Java – about bufferedimage Instructions for getsubimage (int x, int y, int w, int h) methods?

I'm trying to segment the image. I encountered a small fault. I don't know why it happened

This is a quick pseudo code breakdown of my function

>Using imageio Read the image using the read method > split the image using the getsubimage () method as follows:

bufferedImage. getSubimage(300,300, bufferedImage.getWidth()/ columns,bufferedImage. getHeight()/ rows);

>Using imageio The write () method writes it to the images directory

The problem is that the program does not seem to read the int x and int y parameters correctly For example, use 300300 as the above parameter, but it doesn't seem to clip from the coordinates 300300, but from 0,0, no matter what value you enter

Any suggestions!

thank you!

By the way, this is the code in my method:

public static void splitImage(String imageFileName,String format,int rows,int columns) {
    // Load the image file
    File imageFile = new File(imageFileName);

    try {
        BufferedImage bufferedImage = ImageIO.read(imageFile);
        // Split the image up into corresponding number of sub-images
        BufferedImage[][] splitImages = new BufferedImage[rows][columns];

        for (int i = 0; i < splitImages.length; i++) {
            for (int j = 0; j < splitImages[i].length; j++) {
                splitImages[i][j] = bufferedImage.getSubimage(bufferedImage.getWidth() / columns * i,bufferedImage.getHeight() / rows * j,bufferedImage.getWidth() / columns,bufferedImage.getHeight() / rows);
            }
        }

        System.out.println(bufferedImage.getWidth() / columns + "\n" + bufferedImage.getHeight() / rows);

        splitImages[0][0] = bufferedImage.getSubimage(300,bufferedImage.getWidth() / columns * 2,bufferedImage.getHeight() / rows * 2);

        // Write that into the images directory

        for (int i = 0; i < splitImages.length; i++) {
            for (int j = 0; j < splitImages[i].length; j++) {
                imageName++;
                ImageIO.write(splitImages[i][j],format,new File("images/" + imageName + "." + format));
            }
        }

                ImageIO.write(splitImages[0][0],new File("images/" + imageName + "." + format));
    } catch (IOException e) {
        JOptionPane.showMessageDialog(null,"The image file doesn't exist!");
    }   
}

It seems that this is not a problem of method, because it is a problem of file format With GIF, it doesn't work Using JPEG, it works normally

Can anyone explain why?

thank you!

Solution

This is a Java error I believe it has been fixed in JDK 7, but I am not 100% sure (I think the actual fix has been reviewed sometime in September)

http://bugs.sun.com/view_bug.do?bug_id=6795544