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Color conversion definition creating method, color conversion definition creating apparatus, and color conversion definition creating program storage medium

  • US 7,403,315 B2
  • Filed: 04/04/2003
  • Issued: 07/22/2008
  • Est. Priority Date: 04/04/2002
  • Status: Expired due to Fees
First Claim
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1. A color conversion definition creating method of creating a color conversion definition converting coordinate points within a color reproduction area of a first device mediating between an image and image data, in a first RGB color space, depending on the first device, into coordinate points within a color reproduction area of printing in a CMYK color space for printing, the color conversion definition creating method comprising:

  • a first color conversion definition creating step of creating a first color conversion definition for converting the coordinate points within the color reproduction area of the first device in the first RGB color space into coordinate points within a color reproduction area of a second device mediating between an image and image data, in a second RGB color space, depending on the second device, the color reproduction area of the second device being closer to the color reproduction area of the printing than the first device; and

    a second color conversion definition creating step of creating a second color conversion definition for converting the coordinate points within the color reproduction area of the second device in the second RGB color space into coordinate points within a color reproduction area of printing in a CMYK color space,wherein the first color conversion definition creating step is a step of creating a color conversion definition defining an association between the coordinate points in the first RGB color space and the coordinate points in the second RGB color space via a first coordinate conversion step, a second coordinate conversion step, and a third coordinate conversion step,the first coordinate conversion step converting coordinate points within the color reproduction area of the first device in the first RGB color space depending on the first device into the coordinate points within the color reproduction area of the first device transferred to a common color space of device non-dependence,the second coordinate conversion step converting the coordinate points within the color reproduction area of the first device transferred to the common color space, which is obtained by the first coordinate conversion step, into the coordinate points within the color reproduction area of the second device transferred to the common color space, andthe third coordinate conversion step converting the coordinate points within the color reproduction area of the second device transferred to the common color space, which is obtained by the second coordinate conversion step, into the coordinate points within the color reproduction area of the second device in the second RGB color space, andwherein when a first coordinate point within the color reproduction area of the first device transferred to the common color space is converted into a second coordinate point within the color reproduction area of the second device transferred to the common color space, the second coordinate conversion step includes a first step of;

    determining a first reference coordinate point in the color reproduction area of the first device transferred to the common color space, in accordance with the first coordinate point;

    determining a second reference coordinate point associated with the first reference coordinate point, in the color reproduction area of the second device transferred to the common color space, in accordance with a first algorithm including a coordinate operation in at least either one of the first RGB color space and the second RGB color space; and

    determining the second coordinate point associated with the first coordinate point in accordance with a second algorithm using a basic difference vector that is representative of a difference between the first reference coordinate point and the second reference coordinate point.

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