The Ewok movies proved an opportunity for ILM to hone a technique from 2001: A Space Odyssey. The technique, used in photographing matte paintings, is called latent image matte painting. In this technique, during live action photography, a section of the camera's lens is blocked off, remaining unexposed, and a painting is crafted to occupy that space. The film is rewound, the blocked areas reversed, and the painting photographed. Since the painting now exists on the original film, there is no generational quality loss.