Just passing through.  I used his OR gate to turn an image into transparency mask.  Just put the image to be masked (a colorful tattoo image on a white background) into the OR gate and sent the output as a pure black and white mask to the transparency input. Made it into a wonderful decal-like tattoo, with good colors and black was truly black.  (I've been experimenting with the late Shana's Inked series, turning them into Material Layers.)