Patent ID: 6084684
Filing Date: 2000-07-04
Classification: G06K

Abstract:
In a system for preparing an electronic document for printing with a plurality of inks applied to a corresponding plurality of separation plates, the inks having a print order, a method of determining an amount of spread of a first ink on a first plate with reference to a second ink on a second plate, the method comprising:obtaining a trap width;identifying one of the first and second inks as the upper ink according to the print order of the inks and the other ink as the lower ink;obtaining a lightness value LU for the upper ink;obtaining a lightness value LL for the lower ink;obtaining a solidity value SU for the upper ink;computing an upper factor UF for the upper-lower ink pair in accordance with the definition UF=(1-SU).times.LU/(LL+LU).