Color information is computer-generated before embossing process. Photo-polymer is relatively new material. It gives very bright image on a flexible surface. Our holographic sunglasses are made with photo-polymer. One can look through normally, when on the other side they create extremely bright 3-D image.
Some holograms show motion.
They show a few different images, usually changing from side to side. Most commonly 2 or 3 channels are used. Stereograms are the ones that show a smooth movement. They are made of up to a few hundred frames - a little bit like a cartoon movie animation. They can be computer generated, made from digital video or movie tape - showing a short sequence of some action.