Optics: measuring and testing – By shade or color
Patent
1997-12-10
2000-10-03
Font, Frank G.
Optics: measuring and testing
By shade or color
3562435, 356408, 356443, 356404, 347131, 428212, 430 30, G01J 346, G01N 2125, B32B 702, G03C 500
Patent
active
061280909
ABSTRACT:
A visual control strip for imageable media such as a printing plate, a photographic film or a printable substrate is described wherein the visual control strip is to be applied to the imageable medium. The control strip includes a plurality of first control fields having differing grey tone values which are relatively insensitive to the processing variables which influence the size of the spots or dots produced on the imaged medium. The control strip also includes at least one second control field which is relatively sensitive to these process variables. The second control field is located immediately adjacent to the first insensitive control fields for ease of comparison. The second sensitive control field has a target grey tone value which may typically be 25%, 50% or 75%. To improve assessment of exposure parameters, the insensitive fields are completely surrounded by a sensitive field or vice versa.
Methods of using the strip are also described for both traditional or photomechanical and digital reproduction methods.
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The URGA/FORGA Digital Control Wedge and its Application. By Dr. K. Munger.
The URGA/FORGA Postscript Control Strip in Practical Use Part 2. By U. Schmitt Fogra Mitt. vol. 43, No. 148 Aug. 1994, pp.-22-24.
Cauwenberge Jan Van
hunsel Johan Van
Agfa Gevaert N.V.
Font Frank G.
Kelley Edward L.
Merecki John A.
Punnoose Roy M.
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