Method for color balance determination

Details Method for color balance determination Method for color balance determination

1996-03-22

1999-09-28

Metjahic, Safet

Photocopying

Projection printing and copying cameras

Multicolor picture

355 35, 355 83, G03B 2780

Patent

active

059597208

ABSTRACT:
A method of color balance determination for use by a color copying apparatus utilizing a gray estimate established as a functional relationship among at least three basic color density values measured from regions within multiple image frames of a film order. This functional relationship is preferably a fitted line to a set of measured density values from which density values from regions of high color saturation have been excluded. To discriminate these high color saturation regions, the color saturation is determined relative to a gray point calculated as a weighted average of minimum density and image average density values. Further improvement in the gray estimate is achieved by limiting the set of measured density values to regions of high modulance ("edge effect") within the image frames.

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