Automatic color adjustment in a document processing environment

Details Automatic color adjustment in a document processing environment Automatic color adjustment in a document processing environment

1994-12-23

1997-03-04

Brinich, Stephen

Facsimile and static presentation processing

Natural color facsimile

Color correction

358520, G03F 300

Patent

active

056085486

ABSTRACT:
A system and method for automatically adjusting image color in a document processing system are discussed. The system operates by generating a digital representation of a printed document. The digital representation includes a plurality of pixels. A brightness value is calculated for each of the pixels, and a "brightest" list is generated comprising a plurality of the pixels having the largest brightness values. Also, a "darkest" list comprising a plurality of the pixels having the smallest brightness values is generated. An average bright color of pixels in the "brightest" list is generated, and an average dark color of pixels in the "darkest" list is generated. Red, green, and blue scaling functions each having a white point set equal to the average bright color and a black point set equal to the average dark color are generated. The digital representation is scaled in accordance with the red, green, and blue scaling functions to produce a modified image.

REFERENCES:
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patent: 4742387 (1988-05-01), Oshima
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patent: 5341464 (1994-08-01), Friedman et al.
patent: 5420704 (1995-05-01), Winkelman
patent: 5426582 (1995-06-01), Bossaert et al.

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