Color to monochrome conversion

Details Color to monochrome conversion Color to monochrome conversion

1989-09-18

1990-12-11

Oberley, Alvin E.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

358 30, 358166, G09G 500

Patent

active

049773984

ABSTRACT:
The present invention provides a contrast enhancing method and circuit for mapping color signals into signals for driving a display which is capable of displaying shades of gray. With the present invention a preliminary translation is first made between a foreground-background color combination and the various shades of gray that can be displayed. The contrast or separation between the foreground level of gray and the background level of gray produced by this preliminary translation is then compared to parameters set by the operator. If the preliminary translation provides the desired degree of separation between the foreground and the background gray levels, no further translation takes place; however, if the desired degree of separaton was not achieved by the preliminary translation, the system forces further separation between the foreground and background by taking the following action: (a) if the background was darker than the foreground, the background is made still darker and/or the foreground is made still lighter (b) if the background was lighter than the foreground the background is made still lighter and/or the foreground is made still darker.

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patent: 4755954 (1988-07-01), Netter
A Gair, Tonal Values: How to See Them, How to Paint Them, Quatro Publishing, 1987, pp. 6-7, and 18-33.
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Options & Adapters Technical Reference: IBM Color/Graphics Monitor Adapter, Publication S229-6912-00, P/N 6322509, Commercially Available from IBM Corporation, pp. 111-134.
PC Convertible, Technical Reference, Publication No. SA23-1047, Commercially Available from IBM Corporation, pp. 2-45 through 2-62.

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