Optics: measuring and testing – By shade or color
Patent
1980-04-24
1982-01-12
McGraw, Vincent P.
Optics: measuring and testing
By shade or color
356422, 356425, G01J 346, G01J 352
Patent
active
043102484
ABSTRACT:
A color control system for color separation, developing and printing fields including a plurality of strips of film with each strip containing color information and combining to form a color proof. A proof can be analyzed by eye or compared with a control wedge with conforming color information. The proof includes grey balance material visible from highlight through shadow to render grey when all colors are trapping correctly and show color differences on the proof when the colors are not trapping correctly. Color change indicators are on the proof to indicate unacceptable two color combination or an excess of a percentage of a contaminating color in a three color arrangement. Slur controls are on the proof to determine color slurring and permit the analysis of the percentage of color slurring when the proof is compared with later proofs or a control wedge. Highlight and shadow dots are provided to be viewed at chosen times to assure that the dots remain equal to each other with respect to each color in highlight and shadow at all times. Thus the color characteristics and color changes can be monitored at all times to enable the operator to make appropriate mechanical adjustments so that color control is maintained at a high quality level. Also, solid color patches of various colors can be provided to permit direct densitometer readings for comparison with recommended readings as a further color analysis check.
REFERENCES:
patent: 3890048 (1975-06-01), Abbondio et al.
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