Question

我有一个尺寸为[10] [5]的2D数组，我试图将其转换为图像。这是我尝试过的代码，但它似乎并没有保存图像。我做错了什么？

public class GrayScale {

   BufferedImage  image;
   int width;
   int height;

   public GrayScale() {

       try {
          int[][] yourmatrix = new int[][]{
             { 0,  1, 0, 0, 234,  0, 0,   0, 0, 1 },
             { 0,  0, 0, 1,   0,  0, 1,   0, 0, 0 },
             { 0, 45, 0, 0,   0,  0, 0, 231, 0, 0 },
             { 0,  0, 0, 1,   0,  0, 1,   0, 0, 0 },
             { 0,  1, 0, 0,   0, 89, 0,   0, 0, 1 }
          };    

          width = yourmatrix.length;
          height = yourmatrix[0].length;

          for(int i=0; i<height; i++){

             for(int j=0; j<width; j++){
                 int u = yourmatrix[i][j];

                 image.setRGB(j,i,u);
             }
          }

          File ouptut = new File("C:\\Users\\Pratik\\Desktop\\UPWORK\\JAVA\\grayscale.jpg");
          ImageIO.write(image, "jpg", ouptut);

       } catch (Exception e) {}
    }


   static public void main(String args[]) throws Exception{
      GrayScale obj = new GrayScale();
   }
}

Answer 1

初始化宽度和高度后，您必须初始化BufferedImage：

image = new BufferedImage(width, height, BufferedImage.TYPE_BYTE_GRAY);

图片类型可能会有所不同，但由于构造函数的名称为GrayScale，我认为您需要TYPE_BYTE_GRAY。

Answer 2

工作示例：

public class GrayScale {
    int width;
    int height;
    BufferedImage  image;

    GrayScale() {

       try {
          int[][] yourmatrix = new int[][]{
             { 0,  1, 0, 0, 234,  0, 0,   0, 0, 1 },
             { 0,  0, 0, 1,   0,  0, 1,   0, 0, 0 },
             { 0, 45, 0, 0,   0,  0, 0, 231, 0, 0 },
             { 0,  0, 0, 1,   0,  0, 1,   0, 0, 0 },
             { 0,  1, 0, 0,   0, 89, 0,   0, 0, 1 }
          };    

          width = yourmatrix[0].length;
          height = yourmatrix.length;

          image = new BufferedImage(width, height, BufferedImage.TYPE_BYTE_GRAY);

          for(int i=0; i<height; i++){

             for(int j=0; j<width; j++){
                 int u = yourmatrix[i][j];

                 image.setRGB(j,i,u);
             }
          }

          File ouptut = new File("C:\\Others\\grayscale.jpg");
          ImageIO.write(image, "jpg", ouptut);

       }
       catch (Exception e)
       {
       }
    }
}

更正：
1.宽度和高度组件重新排列
2.在正确的地方定义的“图像”对象

从2D阵列创建图像

2 个答案: