java – 关于BufferedImage.getSubimage(int x,int y,int w,int

这是我的函数的快速伪代码细分

>使用ImageIO.read(文件文件)方法读入图像
>使用getSubimage()方法拆分图像,如下所示：

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

>使用ImageIO.write()方法将其写入images目录.

问题是程序似乎没有正确读取int x和int y参数.例如,使用300,300作为上面的参数,但它似乎不从坐标300,300中裁剪,而是从0,0而不管您输入什么值.

有什么建议！

谢谢！

顺便说一下,这是我方法中的代码：

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!");
    }   
}

似乎这不是方法的问题,因为它是文件格式的问题.有了GIF,它没有用.使用JPEG,它工作正常.

有人可以解释一下原因吗？

谢谢！