Photographic printer and method of making a filter for a photogr

Details Photographic printer and method of making a filter for a photogr Photographic printer and method of making a filter for a photogr

1996-09-20

1999-01-05

Mathews, Alan A.

Photocopying

Projection printing and copying cameras

Illumination systems or details

355 80, 355125, 359888, G03B 2772

Patent

active

058568646

ABSTRACT:
A method of improving uneven illumination in a photographic printer having an original image position and a light source to illuminate the original image position, which light source may illuminate the original image position non-uniformly, the method comprising: first forming a mask by exposing a photographic element to the light source and processing the element to form a negative image of the light source at a filtering position between the light source and the original image position; and positioning the mask at the filtering position. A second aspect of the method uses an electronic processor and gathered illumination data, to generate a mask.

REFERENCES:
patent: 2155149 (1939-04-01), Rutherford
patent: 2224839 (1940-12-01), Steiner
patent: 2420141 (1947-05-01), Lessler
patent: 3312143 (1967-04-01), Karow et al.
patent: 4059481 (1977-11-01), Nagano
patent: 4298275 (1981-11-01), Critchlow et al.
patent: 4394089 (1983-07-01), McIntosh et al.
patent: 4472047 (1984-09-01), Stoudt
patent: 4575222 (1986-03-01), Ahern et al.

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