Optics: measuring and testing – By shade or color
Patent
1991-04-01
1993-04-27
Evans, F. L.
Optics: measuring and testing
By shade or color
356406, 356405, 395101, G01I 346
Patent
active
052067076
ABSTRACT:
A microcomputer controlled manual densitometer for the analysis of print control fields has a manual and an automatic operating mode. In the manual mode the measuring functions desired are selected by the operator, while in the automatic mode the measuring function is selected automatically on the basis of the type of the print control field measured. The densitometer is able to recognize the color of the print control field including overprint situations, and to distinguish between solid-tone fields including overprint situations, and to distinguish between full-tone fields and half-tone fields with two different nominal dot areas. For solid-tone fields the color and the solid-tone density, for overprint fields the ink trap and the overprint color and for half-tone fields the dot gain, the color and the nominal dot area, are detected and displayed. The color recognition is based on the relative variables of grayness and color hue error. Solid-tone and half-tone fields are distinguished by continuously updated, solid-tone density dependent dot area limits for corresponding density limits.
REFERENCES:
patent: 4947348 (1990-08-01), Van Arsdell
European Search Report.
Evans F. L.
Gretag Aktiengesellschaft
Hantis K. P.
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