Photoprinting method with means to determing the original light

Details Photoprinting method with means to determing the original light Photoprinting method with means to determing the original light

1995-01-24

1997-11-11

Grimley, Arthur T.

Photocopying

Projection printing and copying cameras

Multicolor picture

355 68, 355 77, 356 41, 356404, G03B 2780, G03B 2772

Patent

active

056869835

ABSTRACT:
An object of the present invention is to estimate subject illuminating light using the minimum number of on-photography information. When no flashes of light exist, color differences R-G and G-B are calculated based on image information detected by an image sensor and the calculated color differences are plotted on color coordinates. It is further determined whether R-G and G-B distributions fall within a fluorescent-lamp light region or a tungsten light region (106). If it is determined that the distributions fall within the fluorescent-lamp light region, then the subject illuminating light is estimated as light such as a night view or fireworks, which is emitted from a light source other than the fluorescent subject illuminating light is estimated as the fluorescent-lamp light when within the tungsten light region, then the subject illuminating light is illuminating light is estimated as light obtained by mixing the tungsten light used as a principal part with light emitted from other light source is changed based on the estimated subject illuminating light to execute a printing process.

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patent: 5467168 (1995-11-01), Kinjo et al.
patent: 5475493 (1995-12-01), Yamana

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