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Method and apparatus for controlling color image reproduction

  • US 6,057,931 A
  • Filed: 03/22/1996
  • Issued: 05/02/2000
  • Est. Priority Date: 07/12/1993
  • Status: Expired due to Term
First Claim
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1. A color control method for use in an image reproducing process where a color image is reduced to a plurality of pixels having different colors with each pixel having a color value, comprising the steps of:

  • (a) assigning to each pixel an HSL value corresponding to the color of the pixel, wherein each color value falls within an HSL color space and includes a hue component falling within a hue range, a saturation component falling within a saturation range, and a level component falling within a level range;

    (b) defining an HSL slice range, the step of defining the HSL slice range including the steps of;

    (1) defining a minimum and a maximum hue value;

    (2) defining a minimum and a maximum saturation value;

    (3) defining a minimum and maximum level value;

    (c) forming an HSL slice by selecting at least one pixel which falls within the HSL slice range, wherein said slice range is defined by outwardly scanning pixels in all directions beginning at a user-selected reference pixel to form a like-colored sector of pixels surrounded by a discontinuity border of differently colored pixels;

    (d) using the HSL range to determine which of the pixels of the color image are to be color corrected; and

    (e) color correcting the HSL slice such that the colors of the pixels contained within the HSL slice are altered.

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