Finds the average of a number of colours. Makes interesting palettes.

average_colour.pde

color a = color(255, 152, 145);
color b = color(52, 81, 255);

void setup(){
  size(500,500);
}

void draw(){
  fill(a);
  noStroke();
  rect(0,0, width/3f, height);
  fill(b);
  rect(width*2/3f, 0, width/3, height);
  fill(mean(a, b));
  rect(width/3f, 0, width/3f, height);
}

void mouseReleased(){
  b = color(random(255), random(255), random(255));
}

void keyReleased(){
  a = color(random(255), random(255), random(255));
}

int mean(color a, color... vals){
  float rsum = red(a);
  float gsum = green(a);
  float bsum = blue(a);
  
  for(int i = 0; i < vals.length; i ++){
    rsum += red(vals[i]);
    gsum += green(vals[i]);
    bsum += blue(vals[i]);
  } 
  
  int n = 1 + vals.length;
  float rmean = rsum/n;
  float gmean = gsum/n;
  float bmean = bsum/n;
  
  return color(rmean, gmean, bmean);
}