Method and device for selecting the appropriate contrast grade p

Details Method and device for selecting the appropriate contrast grade p Method and device for selecting the appropriate contrast grade p

1988-09-14

1989-12-05

Hayes, Monroe H.

Photocopying

Projection printing and copying cameras

Illumination systems or details

355 77, G03B 2772

Patent

active

048856070

ABSTRACT:
A device and method for selecting a contrast grade of paper or variable-contrast filter for printing a black and white negative utilizing a clear substrate having a plurality of sections, each section having a different color equivalent to a different variable contrast filter and each section having approximately the same density.

REFERENCES:
patent: 2226167 (1940-12-01), Gillon
patent: 4351608 (1982-09-01), Coote et al.

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