US 11,841,272 B2
Method for adapting a lab setpoint color value of multicolored printed products
Nikolaus Pfeiffer, Heidelberg (DE); Stefan Schenk, Wiesenbach (DE); Bernd Utter, Schriesheim (DE); and Michael Hansen, Kiel (DE)
Assigned to Heidelberger Druckmaschinen AG, Heidelberg (DE)
Filed by Heidelberger Druckmaschinen AG, Heidelberg (DE)
Filed on Jan. 25, 2023, as Appl. No. 18/159,194.
Claims priority of application No. 10 2022 101 631.5 (DE), filed on Jan. 25, 2022.
Prior Publication US 2023/0236064 A1, Jul. 27, 2023
Int. Cl. H04N 1/54 (2006.01); G01J 3/46 (2006.01)
CPC G01J 3/463 (2013.01) [G01J 3/462 (2013.01); H04N 1/54 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A method of adapting a Lab setpoint color value of multicolored printed products where at least one special color is replaced with the use of an ICC color profile by a combination of at least two process colors participating in the replacement, the method comprising:
metrologically acquiring by a color measuring system at least one measurement point on the printed product that is assigned to the replaced special color and ascertaining therefrom a Lab actual color value of the measurement point by a computer;
using the ICC color profile or a matching standardized ICC color profile for a computer determination of a color composition of a Lab setpoint color value from the participating process colors;
ascertaining layer thicknesses of the participating process colors to achieve a predetermined Lab setpoint color value of the measurement point using a digital tool or a digital model; and
adapting at least the participating process colors using the ascertained changes of the layer thicknesses of the participating process colors.