Tone control of photographic images

Details Tone control of photographic images Tone control of photographic images

1992-06-03

1994-03-08

Baxter, Janet C.

Radiation imagery chemistry: process, composition, or product th

Achromatic image produced from chromatic reproduction image

430402, 430565, 430567, 430568, 430611, 430614, 430615, G03C 500

Patent

active

052926273

ABSTRACT:
Monocyclic and polycyclic azoles having the following formula modify the tone of a silver image formed from a fine grain radiation sensitive silver bromide or silver bromoiodide emulsion layer in which the silver bromide or silver bromoiodide grains have a mean equivalent circular diameter of less than 0.3 .mu.m. The azoles have the formula: ##STR1## wherein Z is --N.dbd. or --C(R.sup.5).dbd. where R.sup.5 is hydrogen, --NH.sub.2, aliphatic of 1 to 8 carbon atoms or aromatic of 1 to 8 carbon atoms;

REFERENCES:
patent: 4720447 (1988-01-01), De Keyzer et al.
patent: 4727017 (1988-02-01), Pollet et al.
patent: 4728601 (1988-03-01), Rowland et al.
patent: 4859565 (1989-08-01), De Keyzer et al.
James, T. H. ed. The Theory of the Photographic Process, 4th Edition, 1977, p. 100.

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