Method for displaying and printing multitone images derived from

Details Method for displaying and printing multitone images derived from Method for displaying and printing multitone images derived from

1991-06-14

1992-09-08

Fuller, Benjamin R.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358 75, H04N 123, H04N 146

Patent

active

051463466

ABSTRACT:
The method of displaying multitone images beginning with a grayscale original image capable of displaying a specific number of gray levels, which includes the steps of: (1) selecting a plurality of colors from the image, one for each of the multitones, each having a color value; (2) selecting a plurality of transfer functions, one for each of the selected colors; (3) converting each of the shades of gray, using the respective color values and the transfer functions, into a new color value; and (4) displaying the resultant multitone image on a video display terminal using the new color values in place of the shades of gray. The displayed image may be printed using one printing plate for each of the selected colors, and using the same transfer functions to convert the shades of gray to new gray values which are subsequently converted into halftone dots for each printing plate.

REFERENCES:
patent: 4719506 (1988-01-01), Van Buren
patent: 4998165 (1991-03-01), Lindstrom

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