PImage imgOriginal;
PImage imgCopia = createImage(320,240,RGB);
PImage imgCopiacinza = createImage(320,240,RGB);
PImage imgCopiared = createImage(320,240,RGB);
PImage imgCopiayellow = createImage(320,240,RGB);
float r,g,b,juncao;

int pos;

void setup(){
  size(640,480);
  imgOriginal=loadImage("original.jpg");

  for (int x=0; x < 320; x++){
    for (int y=0; y < 240; y++){

      pos=(y*320+x);
      r=red(imgOriginal.pixels[pos]);
      g=green(imgOriginal.pixels[pos]);
      b=blue(imgOriginal.pixels[pos]);
      juncao = (0.3*r+0.59*g+0.11*b);
      imgCopia.pixels[pos] =  imgOriginal.pixels[pos];
      imgCopiacinza.pixels[pos] = color(juncao,juncao,juncao);
      imgCopiared.pixels[pos]= color(juncao+70,juncao,juncao);
      imgCopiayellow.pixels[pos]= color(juncao,juncao,juncao-100);
    }
  }


  for (int j=0; j <= 15000; j++){

      r=random(155);
      g=random(155);
      b=random(155);

      int rx = int(random(0,320));
      int ry = int(random(0,240));
      int pos2=(ry*320+rx);
      juncao = (0.3*r+0.59*g+0.11*b);

      imgCopia.pixels[pos2] = color(r,g,b);
      imgCopiacinza.pixels[pos2] = color(juncao,juncao,juncao);
      imgCopiared.pixels[pos2]= color(juncao+100,juncao,juncao);
      imgCopiayellow.pixels[pos2]= color(juncao,juncao,juncao-100);
}
  }

void draw(){
 image(imgCopia, 0, 0);
 image(imgCopiacinza, 320, 0);
 image(imgCopiared, 0, 240);
 image(imgCopiayellow, 320, 240);
}