Education and demonstration – Visual art or craft – artistic adornment – or color training... – Color display
Patent
1990-12-11
1992-12-29
Apley, Richard J.
Education and demonstration
Visual art or craft, artistic adornment, or color training...
Color display
434104, G09B 1900
Patent
active
051747588
ABSTRACT:
A color swatch arrangement for use in selecting colors for four-color offset printing, and a method for creating such an arrangement, involves dividing the visible spectrum into a plurality of distinct hues, and determining the proportions of yellow, red, and blue dot densities needed to create color swatches of each distinct hue. A series of lighter-and-lighter tint swatches associated with each distinct hue are created by reducing each of the yellow, red, and blue dot densities in steps. A series of darker shade swatches is created by adding a proportion of black dot density to each distinct hue and all the stepped lighter tints created from it, and a series of darker-and-darker shade swatches are produced by adding greater proportions of black dot density in stages to all the stepped lighter tints.
REFERENCES:
patent: 173408 (1876-02-01), Leggett
patent: 4104809 (1978-08-01), Day et al.
patent: 4629428 (1986-12-01), Phillips
patent: 4717954 (1988-01-01), Fujita et al.
patent: 4878977 (1989-11-01), Kueppers
patent: 4966461 (1990-10-01), Hopper
Apley Richard J.
Crosby D. F.
Levine Alan H.
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