Pictorial digital image processing incorporating adjustments to compensate for dynamic range differences

  • US 6,628,823 B1
  • Filed: 02/21/2003
  • Issued: 09/30/2003
  • Est. Priority Date: 03/24/1997
  • Status: Expired due to Term
First Claim
Patent Images

1. A method of pictorial digital image processing of an original image comprising the steps of:

  • collecting statistics of an original image;

    obtaining density capabilities of an output device to be used for producing a reproduction;

    determining both an original pictorial dynamic range from the statistics of the original image and a reproduction pictorial dynamic range from the density capabilities of the output device;

    constructing a tone reproduction curve relating the statistics of the original image to the visual density capabilities of the output device, based on a comparison between the original pictorial dynamic range and the reproduction pictorial dynamic range; and

    transforming the original image into color space values, using the tone reproduction curve, for producing the reproduction with the output device.

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