!7

module Grayscale extends DynImageSurface {
  start {
    ownResource(onClipboardImage(voidfunc(final BufferedImage img) {
      temp enter();
      thread { setImage(new BWImage(img)); }
    }));
  }
  
  BWImage getBWImage() { ret toBWImage(getImage()); }
  
  visualize {
    ret withCenteredButtons(super.visualize(),
      "Auto-contrast", rThread { setImage(bwAutoContrast(getBWImage())) },
      "Contrast+", rThread { setImage(bwContrast(1.1, getBWImage())) }
    );
  }
}