Method and system for displaying color on a computer output devi

Details Method and system for displaying color on a computer output devi Method and system for displaying color on a computer output devi

1990-05-22

1996-01-16

Jankus, Almis R.

395129, G06T 1700

Patent

active

054855586

ABSTRACT:
A method and system for generating a dither pattern for a specified color is provided. In a preferred embodiment of the present invention, a system generates a dither pattern corresponding to a specified RGB value. The dither pattern contains a specified number of pels, each pel capable of being set to each color in a set of active colors. Each active color has a corresponding RGB value. Each RGB value is defined as a point in a three dimensional coordinate system having a red, green, and blue component. The coordinate system has a plurality of non-overlapping, spaces with each vertex representing an active color. One space is designated as a mapping space. The system maps the specified RGB value to the mapping space from an original space containing the specified RGB value. The system then determines the four active colors whose corresponding RGB values are closest to the mapped RGB value. The system then determines the number of pels in the dither patter to set to each determined active color based on the distance between the RGB value corresponding to the determined active color and the mapped RGB value. The system then maps the determined active colors to the original space. Finally, the system sets the pels in the dither pattern to the mapped active colors based on the determined number of pels for that color.

REFERENCES:
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patent: 5070413 (1991-12-01), Sullivan et al.
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patent: 5287195 (1994-02-01), Blumer
Jarvis, J. F., C. N. Judice, and W. H. Ninke, "A Survey of Techniques for the Display of Continuous Tone Pictures on Bilevel Displays," Computer Graphics and Image Processing 5:13-40, 1976.

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