Abstract: An optical image splitter disposed in the path of image-bearing light along an optical axis has a coated dichroic surface disposed at an angle of 15 degrees or less relative to incident light along the optical axis. The coated dichroic surface has a number of layers of material, the of layers including layers having a first refractive index, nL, and layers having a second refractive index, nH, greater than the first refractive index. The coated surface transmits light of at least a first wavelength range to form a first image at an image plane and reflects light of a second wavelength range to form a second image at the image plane.

Abstract: A method of recording an image of an object onto cinematographic color film comprises forming a number of successive images of the object through a single lens system onto each frame of the film, the successive images being recorded in light of different characteristics, for example different colors. In a preferred embodiment, each frame of the film is exposed successively to light of two or three different colors. The film is projected using a conventional projector, and when viewed through spectacles consisting of two appropriate filters gives a stereoscopic effect. The method can be used to produce a film which can also be viewed without spectacles, and is found to give enhanced sharpness and color saturation. The invention also includes a moving film camera having a mechanism for interposing a number of filters in the optical path successively during exposure of each frame so that successive images are overlaid on each frame.

Abstract: A method of obtaining images of different color intensities, combinations and relationships using at least two information images produced from a master image comprises, in one method cycle, positioning at least two information images successively in the same position, illuminating each information image with light flashes of a color selected from at least two primary colors and synchronising the resulting successive effects.The invention also includes an apparatus suitable for use with this method.

Abstract: A color image carrier such as positive film is brought into contact with a monochrome recording medium such as silver salt film. The color image carrier is illuminated with red, green and blue beams. These three color beams respectively can project coded information about diffraction gratings or slits which are different in angle or pitch in accordance with the respective colors. Thus, each color image carrier containing the coded information about each diffraction grating or slit is recorded on the monochrome recording medium.