Question

I have a 30 x 40 pixel .bmp file that I want to load into inputData that is declared like the following:

byte[][] inputData = new byte[30][40];

I relatively new to programming, so any one can tell me what classes should I being using to do so? thanks!

I don’t know how to access the .bmp file in the same package and assign the corresponding (x, y) position onto my 2-D byte array. So far I have the following:

for (int x = 0; x < inputData.length; x++)
{
    for (int y = 0; y < inputData[x].length; y++)
    {
        // inputData[x][y] =
    }
}

Answer 1

You can use the ImageIO in Java 5+ to read a BMP file into a BufferedImage. The BufferedImage can already convert to int[]

In your case, extracting the green channel into the byte array:

BufferedImage img = ImageIO.read(new File("example.bmp"));
// you should stop here
byte[][] green = new byte[30][40];
for(int x=0; x<30; x++){
  for(int y=0; y<40; y++){
     int color = img.getRGB(x,y);
     //alpha[x][y] = (byte)(color>>24);
     //red[x][y] = (byte)(color>>16);
     green[x][y] = (byte)(color>>8);
     //blue[x][y] = (byte)(color);
  }
}
byte[][] inputData = green;