Hello. I just began to use processing and I am quite lost in trying to polarize the RGB values of a picture. Here is my code so far and I would be very grateful if anyone can give some help. Thanks!

// Shaun Chun

int imageWidth, imageHeight, width, height, colorAvg;
float averageRed, sumRed;
String imageFilename;
PImage image;

// This method sizes the output panel based on the size of the given image.

void setup() {
 imageFilename = "picasso-weeping-woman-1937.jpg";
 loadPicassoImage(imageFilename);
 imageWidth = image.width;
 imageHeight = image.height;
 width = imageWidth;
 height = imageHeight;
 size(width, height);
 background(255);
 displayPicassoImage();
 polarize();
}

void draw() {
 polarize();
}

void loadPicassoImage(String filename) {
 image = loadImage(filename);
}

void displayPicassoImage() {
 image(image, 0, 0);
}



// Polarizes the red value of all the pixels.

void polarize () {
 
 sumRed = 0;

 for (int i = 0; i < imageWidth; i++) {
   for (int j = 0; j < imageHeight; j++) {
     sumRed += red(image.get(i, j));
   }
 }
 
averageRed = sumRed / (width * height);
 color c;
 
 for (int i = 0; i < imageWidth; i++) {
   for (int j = 0; j < imageHeight; j++) {
     if (red(image.get(i, j)) > averageRed)
     {
       image.set(0, 0, color(red(255)));
     }
     else {
       image.set(0, 0, color(red(0)));
     }
   }
 }

}