Gradation display control apparatus for converting color data de

Details Gradation display control apparatus for converting color data de Gradation display control apparatus for converting color data de

1992-07-24

1994-03-29

Oberley, Alvin E.

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

345147, 345 3, G09G 300

Patent

active

052988937

ABSTRACT:
Color data is converted into specific number of gradation data. A table is provided storing a correspondence between gradation data and color data. The gradation data is computed based on Gradation data=K SIN (.alpha.x+.beta.) 0.ltoreq.x.ltoreq.n wherein K is a constant, x is a color data, .beta. defines phase and contributes to modify the gradation data for the color data, and .alpha. defines frequency and contributes to modify a degree of the modification. Two color data having large luminance levels are converted into gradation data having a large difference in gradation level. Control data for changing the values of .alpha. and .beta. in the above equation is input from a keyboard. A user can arbitrarily change the gradation data to be set in the conversion table from the keyboard.

REFERENCES:
patent: 4737772 (1988-04-01), Nishi et al.
patent: 4751502 (1988-06-01), Ishii et al.

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