Process for visually detecting a color drift in a polychrome rep

Details Process for visually detecting a color drift in a polychrome rep Process for visually detecting a color drift in a polychrome rep

1989-11-02

1991-08-20

Evans, F. L.

Optics: measuring and testing

By shade or color

356403, G01J 346

Patent

active

050408976

ABSTRACT:
The invention relates to the printing industry, and is based on the comparison of a reproduction under inspection with a reference polychrome graphic representation. Respective reference axes (A.sub.1, A.sub.2) are defined for the reference representation and the reproduction under inspection. These axes are normal to and go through an equivalent point of the representation and reproduction, respectively. The two latter are rotated around their reference axes, producing whirling images (D.sub.1, D.sub.2) formed of concentric color rings (a.sub.1, a.sub.2, . . . a.sub.n and a'.sub.1, a'.sub.2, . . . a'.sub.n) each having a set width and shade, and forming a basis for detecting a possible color drift.

REFERENCES:
patent: 1151395 (1915-08-01), Roberts
patent: 1924747 (1933-08-01), Nickerson
patent: 2054195 (1936-09-01), Forrest et al.
patent: 2221916 (1940-11-01), Forrest et al.
patent: 2953963 (1960-09-01), Bulkley et al.

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