Abstract: An electronic color image capture system includes an optical section for separating an input image into its separate color content and directing the separate color content toward an imaging section, which generates a plurality of color image signals from the input image. The spectral responses of the optical section and the imaging section are selected so as to cascade together to provide all-positive, symmetrical system curves modeled upon red, green and blue color matching functions representative of the human visual system. The color matching functions are derived from three monochromatic light sources and contain no more than three positive lobes as well as one or more negative lobes, wherein the areas under the color matching functions determined by (a) summation of all negative lobes and (b) overlap between the green and red color matching functions are minimized.

Abstract: An electronically originated image is converted into a modified electronic image simulating an image originated from a film system and converted into an electronically displayed image. The technique employed is based on a set of electronic camera system spectral product curves that are substantially approximated by a linear combination of a set of spectral product curves characteristic of the film system. An image is captured having red, green and blue exposure signals resulting from these electronic camera system spectral product curves, and the red, green and blue exposure signals are then converted into a modified electronic image simulating an image originated from a film system and converted into an electronically displayed image. Because of the linear approximation between the spectral product curves, the conversion step can be performed by a matrixing operation.

Abstract: An electronic color image capture system includes an optical section for separating an input image into its separate color content and directing the separate color content toward an imaging section, which generates a plurality of color image signals from the input image. The spectral responses of the optical section and the imaging section are selected so as to cascade together to provide all-positive, symmetrical system curves modeled upon red, green and blue color matching functions representative of the human visual system. The color matching functions are derived from three monochromatic light sources and contain no more than three positive lobes as well as one or more negative lobes, wherein the areas under the color matching functions determined by (a) summation of all negative lobes and (b) overlap between the green and red color matching functions are minimized.