Question

我有一个2D整数数组，我可以从BufferedImage方法获取“getRGB（）”。当我尝试将2D整数数组转换回BufferdImage时，我只得到一张黑色图片。

此方法

BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
    for (int i = 0; i < matrix.length; i++) {
        for (int j = 0; j < matrix[0].length; j++) {
            int pixel=matrix[i][j];
            System.out.println("The pixel in Matrix: "+pixel);
            bufferedImage.setRGB(i, j, pixel);
            System.out.println("The pixel in BufferedImage: "+bufferedImage.getRGB(i, j));
        }
    }

给出这个输出：

The pixel in Matrix: 0
The pixel in BufferedImage: -16777216
The pixel in Matrix: 721420288
The pixel in BufferedImage: -16777216
The pixel in Matrix: 738197504
The pixel in BufferedImage: -16777216
The pixel in Matrix: 520093696
The pixel in BufferedImage: -16777216
The pixel in Matrix: 503316480
The pixel in BufferedImage: -16777216

为什么每个Pixel都是“-16777216”？

谢谢！

更新

返回整数矩阵的方法

public int[][] getMatrixOfImage(BufferedImage bufferedImage) {
    int width = bufferedImage.getWidth(null);
    int height = bufferedImage.getHeight(null);
    int[][] pixels = new int[width][height];
    for (int i = 0; i < width; i++) {
        for (int j = 0; j < height; j++) {
            pixels[i][j] = bufferedImage.getRGB(i, j);
        }
    }

    return pixels;
}

Answer 1

所有像素似乎都是黑色的，具有不同的alpha值。您必须使用TYPE_INT_ARGB才能丢失Alpha通道。

Answer 2

如果您使用TYPE_INT_RGB，则可以这样做：

BufferedImage.getRaster().setPixels(xCord, YCord, Width, Height, IntArray);

java如何将int [] []转换为BufferedImage

2 个答案: