Contact screen for contrast control

Details Contact screen for contrast control Contact screen for contrast control

1985-08-20

1987-06-23

Corbin, John K.

G02B 500

Patent

active

046748385

ABSTRACT:
A contact screen for controlling contrast in producing color reproductions by the two-sheet diffusion transfer process yields sharply defined edges and faithful color reproductions without a screen structure if every screen element has a constant measured density from edge to edge that is in the range between 0.90 and 1.40 and if the integral density of the contact screen is between 0.30 and 0.40; the covered surface area occupied by the screen elements amounts to between 40% and 50% of the total surface area of the contact screen. The contact screen can be used for both opaque originals and transparencies.

REFERENCES:
patent: 3493381 (1970-02-01), Maurer
patent: 4262070 (1981-04-01), Liu

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