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Color conversion method and apparatus

  • US 5,937,089 A
  • Filed: 10/13/1997
  • Issued: 08/10/1999
  • Est. Priority Date: 10/14/1996
  • Status: Expired due to Fees
First Claim
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1. A method of converting input colors reproducible by a first color image output device to output colors reproducible by a second color image output device, said input colors and said output colors being defined in a color coordinate system with separate lightness and chromaticity coordinates, comprising the steps of:

  • selecting an input white color having a maximum lightness reproducible by said first color image output device;

    selecting an input black color having a minimum lightness reproducible by said first color image output device;

    selecting an output white color having a maximum lightness reproducible by said second color image output device;

    selecting an output black color having a minimum lightness reproducible by said second color image output device;

    determining a scaling coefficient according to a ratio of a lightness difference between said output white color and said output black color to a lightness difference between said input white color and said input black color; and

    scaling said color coordinate system according to said scaling coefficient.

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