Tone rendition of halfstone images by projection exposure

Details Tone rendition of halfstone images by projection exposure Tone rendition of halfstone images by projection exposure

1994-04-15

1995-10-31

Neville, Thomas R.

Radiation imagery chemistry: process, composition, or product th

Effecting frontal radiation modification during exposure,...

430264, 430 22, 430 30, 430327, 1014011, 101395, 359893, G03C 504

Patent

active

054628415

ABSTRACT:
A method for producing a reproduction in reduced or enlarged size of a halftone original with improved tone rendition by the use of a continuous tone correction mask in conjunction with the halftone original applied in projection exposure.
It is a particular characteristic of the present invention that said improved tone rendition is obtained by using in said projection exposure a mask image, the maximum density (i.e. density at 3% dot value areas of the halftone original used in the projection exposure) is linearly directly proportional to the screen ruling of the halftone original used in the projection exposure (see FIG. 2 and 3).

REFERENCES:
patent: 4308326 (1991-12-01), Wirth
patent: 4708459 (1987-11-01), Cowan et al.
patent: 4997733 (1991-05-01), Carleer et al.
patent: 5010398 (1991-04-01), Nys et al.
patent: 5283140 (1994-02-01), Netz et al.

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