sclass Image332 {
  int w;
  byte[] pixels;
  
  *() {} // for persistence
  
  *(RGBImage img) {
    w = img.getWidth();
    int h = img.getHeight();
    pixels = new byte[w*h];
    for y to h: for x to w:
      pixels[y*w+x] = to332(img.getInt(x, y));
  }
  
  int h() {
    ret l(pixels)/w;
  }
  
  RGBImage toRGB() {
    int h = h();
    RGBImage img = new RGBImage(w, h);
    for y to h: for x to w:
      img.setPixel(x, y, from332(pixels[y*w+x]));
    ret img;
  }
}