Method and apparatus for detecting and printing color photograph

Details Method and apparatus for detecting and printing color photograph Method and apparatus for detecting and printing color photograph

1985-05-06

1987-02-10

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 75, 355 38, G03F 308, H04N 146, G03B 2780

Patent

active

046426841

ABSTRACT:
In automatic color printing, there is a need to identify scenes that have been exposed with a very narrow-band illuminant and to apply no color correction to such scenes. Narrow-band illuminant scenes are identified according to the present invention by scanning the original image in three primary colors to generate three color value distributions. The statistics of the three color value distributions are computed, and if the ratio of the standard deviations for any two of the color value distributions is greater than a first predetermined constant (e.g. 4.0) or less than a second predetermined constant (e.g. 0.25), no color correction is employed. The method is particularly useful in a scanning color photographic printer employing histogram modification to effect tone-scale and color balance adjustments.

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"Automatic Color Printing Techniques," by J. Hughes and J. K. Bowker; Image Technology, Apr./May, 1969, pp. 39-43.

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