Method of converting light data to color data with use of matrix

Details Method of converting light data to color data with use of matrix Method of converting light data to color data with use of matrix

1988-05-09

1990-03-20

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 75, H04N 140

Patent

active

049105892

ABSTRACT:
A color converting method in a color image reading apparatus operable to read image information by optically scanning a color transcript, which method comprises the steps of dividing a color space determined by light data of R, G and B into n areas, at the time light data of R, G and B obtained from light reflected from the color transcript are converted into Y (yellow), M (magenta) and C (cyan) data, which are color data for an ink, by the use of matrix coefficients; and converting the light data into color data with the use of matrix coefficients obtained by an approximate equation fixed for each area.

REFERENCES:
patent: 2790844 (1957-04-01), Neugebauer
patent: 2799722 (1957-07-01), Neugebauer
patent: 4307962 (1981-12-01), Jung
patent: 4458265 (1984-07-01), Yoshida et al.
patent: 4643563 (1987-02-01), Sayanagi
patent: 4683492 (1987-07-01), Sugiura et al.

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