Argument out of range exception

Question

What I'm trying to do is look at a list of sprites and make a list out of each pixel in the array. This is most likely a bit confusing, so let me show you my code.

 public List<Sprite> img = new List<Sprite>();
 
     public List<List<Color>> color = new List<List<Color>>();
 
     void Start(){
         //for every image
         for (int a = 0; a < img.Count; a++) {
             //for every pixel that image is wide
             for (int i = 0; i < img[a].texture.width; i++) {
                 //for every pixel that image is high
                 for (int j = 0; j < img[a].texture.height; j++) {
                     //new color for every pixel of image a
                     Color pixel = img[a].texture.GetPixel (i, j);
                     //add all the pixel colors to the list in the color list at index a
                     //error here
                     color[a].Add (pixel);
                 }
             }
         }
         Debug.Log (color.Count);
         Debug.Log (color[0].Count);
         Debug.Log (color[1].Count);
     }

I'm getting an argument out of range exception on line 16, and I'm not sure why. If anyone else does, it would be very much appreciated.

And if it makes anyone feel better, I also wrote this other description of what I want it to do. (sorry its sideways, I don't know how to fix it.)

alt text

Answer 1

Simple problem - you're calling color[a].Add (pixel), but there's no element [a] in color yet! So what you need to do is add a List for every image. Your script should actually look like this:

  public List<Sprite> img = new List<Sprite>();
  
      public List<List<Color>> color = new List<List<Color>>();
  
      void Start(){
          //for every image
          for (int a = 0; a < img.Count; a++) {
              color.Add(new List<Color>()) //THIS IS THE LINE I ADDED
              //for every pixel that image is wide
              for (int i = 0; i < img[a].texture.width; i++) {
                  //for every pixel that image is high
                  for (int j = 0; j < img[a].texture.height; j++) {
                      //new color for every pixel of image a
                      Color pixel = img[a].texture.GetPixel (i, j);
                      //add all the pixel colors to the list in the color list at index a
                      //error here
                      color[a].Add (pixel);
                  }
              }
          }
          Debug.Log (color.Count);
          Debug.Log (color[0].Count);
          Debug.Log (color[1].Count);
      }

Argument out of range exception

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