Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1986-05-05
1988-01-12
Groody, James J.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 76, G03F 308, G03F 310
Patent
active
047195061
ABSTRACT:
A process for color correcting an original color transparency in making individual plates for color printing comprises the steps of directing light through the transparency, adjusting the relative color densities of the primary color components (yellow, magenta and cyan) in the light to provide a desired color balance in the overall appearance of the transparency, determining the individual color densities of the primary color components at that desired color balance, determining the amounts of correction to the yellow, magenta and cyan dot percentages (dot sizes) in order to compensate for contamination of one or more colors in each of the three primary colors of printing inks, and scanning the color transparency. When the transparency is scanned, the individual color densities are initially electronically adjusted to respective amounts that are proportional to respective intensities of the primary components of the adjusted light through the transparency, and then are secondarily electronically adjusted by amounts that are proportional to respective amounts of correction to yellow, magenta and cyan dot percentages attributable to printing ink contamination. Scanning then generates yellow, magenta and black halftone separation films, which are corrected to compensate for printing ink contamination, for making four-color printing plates. Apparatus for carrying out the process includes a transparency viewer having the capability of varying the individual color densities, in combination with a scanner or digital imaging device for generating color halftone separation films.
REFERENCES:
patent: 4200365 (1980-04-01), Keondjian et al.
patent: 4310848 (1982-01-01), Carter et al.
patent: 4583186 (1986-04-01), Davis et al.
Crosfield Magnascan 625/635 E/M Operator's Manual, Issue 01, Crosfield Electronics, Ltd., London, England, date unknown.
Groody James J.
McCully Michael D.
Svihla Randall S.
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