Process for making photo-mechanical drop-out mask

Details Process for making photo-mechanical drop-out mask Process for making photo-mechanical drop-out mask

1977-06-02

1978-09-12

Kimlin, Edward C.

Gas separation: apparatus

Apparatus for selective diffusion of gases

Immobilized liquid membrane

96 6, 96 17, 96 383, 96 44, 355125, G03C 704, G03C 716, G03C 506

Patent

active

041134850

ABSTRACT:
A photograph of an object is made on color film in a conventional manner. Then the object is back-lighted only to silhouette it and a second photograph is made using the same film. The two films are developed simultaneously so as to subject them to identical processing conditions. Using the photograph taken while the object was back-lighted, a contact exposure is made on a high contrast film to produce a negative. After development of this negative, it and the initial, front-lighted, photograph of the object are employed on a scanner to produce the color separations for printing purposes.

REFERENCES:
patent: 1670195 (1928-05-01), Gerland
Erwin Jaffe, et al. Color Separation For Offset Lithography with an Introduction to Masking, 1960-Lithographic Technical Foundation, Inc., N.Y., pp. 81 and 82.

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