Halftone: The reproduction of continuous-tone subjects such as photographs through a contact halftone screen, which converts the image into dots with equal spacing and different sizes.
Hologram: The pattern on a photosensitive material or embossed into a polymeric film structure resulting from an interference pattern created by a laser light striking an object, then merging with a reference beam of the same light.
Hot Stamping: An image producing method utilizing support film which carriers a colored metallic substance, which can be transferred using heat and pressure. Most commonly used to create metallic effects.