Automatic snow/beach correction for photographic printer

Details Automatic snow/beach correction for photographic printer Automatic snow/beach correction for photographic printer

1978-04-17

1979-09-18

Hix, L. T.

Photocopying

Projection printing and copying cameras

Multicolor picture

355 88, G03B 2778

Patent

active

041681215

ABSTRACT:
An automatic system for classifying photographic negatives containing snow or beach scenes measures the red, green, and blue densities of the negative to be printed. Signals indicative of red, green, and blue exposure times are derived from these measured densities, and the signal indicative of the blue exposure time is compared to the signals indicative of the red and green exposure times. The results of this comparison indicate whether a snow or beach scene is present. To determine the amount of density correction, if any, the densities of the negative at a plurality of points are measured. The extent of the density correction is determined by the number of points whose density is within a predetermined interval of the maximum density measured from any one of the points.

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