twocolor_gene.pde

/* Created by sota1235
 * Date:2014/02/14
 */
 
PImage img, img2;
img = loadImage("path/image");
int w = img.width, h = img.height;

size(w, h);
img2 = createImage(w,h,RGB);

img.loadPixels();
img2.loadPixels();

for(int i=0;i<w*h;i++){
  if(brightness(img.pixels[i]) > 180) {
    img2.pixels[i] = color(255);
  } else {
    img2.pixels[i] = color(0);
  }
}

img.updatePixels();
img2.updatePixels();

image(img2, 0, 0);
save("path/");