Under-color removal method and device therefor

Details Under-color removal method and device therefor Under-color removal method and device therefor

1989-12-28

1992-01-28

Brinich, Stephen

Facsimile and static presentation processing

Static presentation processing

Attribute control

358400, G03F 308

Patent

active

050847627

ABSTRACT:
A method and device for obtaining, by rapid and accurate calculation, a black-printer amount and a under-color amount to be removed in order to reproduce colors which are required on the prints. According to this invention, there is provided an under-color removal method and the device therefor including the steps of selecting a minimum density out of equivalent neutral densities of three primary colors in order to reproduce desired colors, calculating a black-printer amount of said selected equivalent neutral densities using a predetermined function, calculating the amounts of three primary color under-colors to be removed based on the three primary color equivalent neutral densities and the black-printer amount respectively and by means of a preset look-up table, subtracting the three primary color under-color removal amounts from the three primary color equivalent neutral densities, obtaining an amount of ink or dot percentage corresponding to a difference of the substraction and to the black-printer amount, and outputting the same.

REFERENCES:
patent: 4763190 (1988-08-01), Froelich
patent: 4897799 (1990-01-01), Le Gall et al.
patent: 4930007 (1990-05-01), Sugiura et al.
patent: 4985759 (1991-01-01), Ito
patent: 5016097 (1991-05-01), Shimano

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