Pimage img;

void setup(){

  img = loadImage("wintersky.jpg");

float blueAverage (Pimage img){

  //Docs say to "load pixels" before doing anything with a Pimage

  img.loadPixels();

  

  //Keep track of number of pixels

  int numPixels = 0;

  

  //Keep track of cumulative blue value

  int blueSum = 0;

  

  for (int i = 0; i < img.pixels.length; i++) {

    //Increase pixel count by one

    numPixels++;

    

    //Increase blue sum by blue value of the color of the pixel at current index

    blueSum = blueSum + img.pixels[i].blue();

  }

  

  //Return the sum of the blue values, divided by the number of pixels

  return (float)blueSum/(float)numPixels;

}

Here's what I have so far. The question is to return the average number of blue pixels in that picture. 

How do I go further? THANK YOU!

I would like to have the snow accumulate on top of the umbrella and stay there as the umbrella moves to collect more snow. I'm taking a mandatory Computer Science class that uses Processing and have been only at it for five weeks. 

Here's my code so far ( note that the images will not show up on your processing. I've attached a screenshot.) 

Thanks, any help is appreciated!