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Method and apparatus for changing specified color in a color image

  • US 5,719,639 A
  • Filed: 03/20/1996
  • Issued: 02/17/1998
  • Est. Priority Date: 03/29/1995
  • Status: Expired due to Term
First Claim
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1. A method of changing a color in a color image into another color, said method comprising the steps of:

  • (a) specifying first and second colors for defining a color range to be processed by color change operation;

    (b) specifying a substitute color, which is to be used as a color component of a changed color after said color change operation;

    (c) obtaining first and second color vectors representing said first and second colors in a color space;

    (d) obtaining a substitute color vector representing said substitute color in said color space;

    (e) obtaining a third color vector linearly independent of the first and second color vectors;

    (f) expressing a color of each pixel in said color image by a linear combination of said first through third color vectors, to thereby obtain first through third coefficients for said first through third color vectors; and

    (g) if said first coefficient for a current pixel is positive, executing the color change operation through combing said substitute color vector, said second color vector, and said third color vector while using said first through third coefficients as weighting factors, respectively, to thereby produce a changed-color vector representing a changed color of the current pixel.

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