Photocopying – Projection printing and copying cameras – Multicolor picture
Patent
1988-10-24
1990-05-29
Hix, L. T.
Photocopying
Projection printing and copying cameras
Multicolor picture
355 77, 358 80, G03B 2780
Patent
active
049299786
ABSTRACT:
A color correction method applicable to a digital processing type of color copier, whereby a set of color patches of respectively different sample colors is printed using a set of printing data values, the color patches are then scanned and analyzed to obtain color patch input data values by the color copier, and each of all of the possible input color data values that can be produced by the scanner/analyzer section of the color copier is then related to one of the color patch input data values which is closest thereto in a 3-dimensional color space. Each of these possible input color data values is thereby related to an appropriate color printing value, whereby a color correction table can be generated which provides correction accuracy that is independent of non-linearity of color printing characteristics.
REFERENCES:
patent: 4058828 (1977-11-01), Ladd
patent: 4402007 (1983-08-01), Yamada
patent: 4745466 (1988-05-01), Yoshida et al.
"The Specification of Colour Appearance. I. Concepts and Terms", by R. W. G. Hunt, Color Research and Application, vol. 2, No. 2, (1977), pp. 55-68.
Kanamori Katsuhiro
Kanno Yoshimitsu
Kawakami Hidehiko
Kotera Hiroaki
Kurosawa Toshiharu
Hix L. T,.
Matsushita Electric - Industrial Co., Ltd.
Rutledge D.
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