Method and apparatus for preparing polychromatic printing plates

Details Method and apparatus for preparing polychromatic printing plates Method and apparatus for preparing polychromatic printing plates

1992-02-28

1994-06-21

Coles, Sr., Edward L.

Facsimile and static presentation processing

Natural color facsimile

Measuring, testing, and calibrating

358515, 358299, H04N 123, H04N 146

Patent

active

053232488

ABSTRACT:
A method of processing a file of recorded color separation values of color elements for use in preparing polychromatic printing plates in order to reduce or eliminate defects caused by misregistration by printing, includes the steps (a) defining a pluralitY of predetermined color types; (b) identifying the color pairs where there is a change in color between adjacent color elements; and (c) for each color pair, determining whether or not to make a frame according to first predetermined criteria based on specific combination of color types in the pair, and then according to second predetermined criteria based on the difference in luminance between corresponding color separations in the respective pair For those color pairs in which a frame is to be generated, the location of the frame is determined according to third predetermined criteria based on specific combinations of color types in the pair, and then according to fourth predetermined criteria based on the sum of the luminances of each color in the color pair.

REFERENCES:
patent: 4583116 (1986-04-01), Hennig
patent: 5113249 (1992-05-01), Yosefi

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