Method of adjusting brightness of photographic print

Details Method of adjusting brightness of photographic print Method of adjusting brightness of photographic print

1996-10-16

1999-02-23

Moses, Richard

Photocopying

Projection printing and copying cameras

Multicolor picture

358518, G03B 2772

Patent

active

058750215

ABSTRACT:
In a photographic printer, red, green and blue light beams are modulated respectively according to red, green and blue image signals DR, DG and DB each made up of image signal components representing densities of respective picture elements, and a color image is recorded on a color photosensitive material by scanning the photosensitive material with the modulated light beams. Picture elements which are of brightness not higher than a first predetermined brightness close to the shadow or not lower than a second predetermined brightness close to a highlight and are of chroma not higher than a predetermined chroma are detected on the basis of the image signals DR, DG and DB. The image signal components for the detected picture elements which form a continuous region in the image are excluded from the image signals DR, DG and DB, thereby obtaining image signals DR', DG' and DB'. The brightness of the photographic print obtained is adjusted on the basis of the mean of the densities represented by the image signal components of the image signals DR', DG' and DB'.

REFERENCES:
patent: 5434649 (1995-07-01), Hasuo et al.
patent: 5477317 (1995-12-01), Edmunds et al.
patent: 5696840 (1997-12-01), Usami
patent: 5699451 (1993-10-01), Birgmeir et al.
patent: 5712924 (1995-10-01), Fujimoto et al.
patent: 5719689 (1995-10-01), Terada

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