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Method for compensating image color when adjusting the contrast of a digital color image

  • US 6,438,264 B1
  • Filed: 12/31/1998
  • Issued: 08/20/2002
  • Est. Priority Date: 12/31/1998
  • Status: Expired due to Term
First Claim
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1. A method for processing a digital color image having a plurality of pixels, the method comprising the steps of:

  • (a) receiving a tone scale function;

    (b) calculating a local slope of the tone scale function for each pixel of the digital color image based on a ratio calculation evaluated for each pixel;

    (c) calculating a color saturation signal from the digital color image, and (d) adjusting the color saturation signal of the digital color image for each of the pixels based on the calculated local slope.

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