Photocopying – Contact printing – Light boxes
Patent
1989-08-17
1990-08-14
Grimley, A. T.
Photocopying
Contact printing
Light boxes
355246, 355204, G03G 1501
Patent
active
049491350
ABSTRACT:
While the human eye does not respond linearly to density and luminance changes, it does respond linearly to lightness L*. Equal increments on the L* scale do represent approximately equal steps in the perceived lightness of related colors. Near uniform color scales are available wherein equal differences in the color co-ordinates correspond to roughly equal visual differences. Accordingly, the disclosure relates to a visual-based process control method for copiers and printers which is based on a near uniform human visual response space rather than a density space. This gives a better control on the average for minimizing error in the human visual space than if the density space is used.
REFERENCES:
patent: 3799668 (1974-03-01), McVeigh
patent: 4058828 (1977-11-01), Ladd
patent: 4068940 (1978-01-01), Bobbe
patent: 4159174 (1979-06-01), Rising
patent: 4310237 (1982-01-01), Gengelbach
patent: 4350435 (1982-09-01), Fiske et al.
patent: 4385823 (1983-05-01), Kasper et al.
patent: 4451137 (1984-05-01), Farley
patent: 4843573 (1989-06-01), Taylor et al.
Hunt, Dr. R. W. G., "The Reproduction of Color", Uniform Color Spaces, (4th Edition, Van Nostrand Reinhold, 1987), pp. 114-123.
Eastman Kodak Company
Grimley A. T.
Royer William J.
Sales Milton S.
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