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Method of converting colorimetric values, and color image output apparatus

  • US 6,522,778 B1
  • Filed: 03/08/1999
  • Issued: 02/18/2003
  • Est. Priority Date: 03/11/1998
  • Status: Expired due to Term
First Claim
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1. A method of converting colorimetric values, comprising the steps of:

  • measuring a gray chart having equal gradations of hues of image data with a first colorimeter to obtain a measure reflectivity Rλ

    1;

    measuring a gray chart having one or more gray patches and having a constant reflectivity irrespective of the wavelength within a visible wavelength range at predeterimined wavelength intervals dλ

    , with a second colorimeter and said first colorimeter to obtain a reflectivity at each of the wavelength intervals;

    determining colorimetric values X, Y, Z according to the equations;

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