Heidelberger Druckmaschinen Ag

Bernd Utter

Nikolaus Pfeiffer

Martin Mayer

Manfred Schneider

Helmut Siegeritz

Stefan Schenk

Michael Hansen

Ulf Delang

Friedrich Heuss

A method of adapting a Lab setpoint color value of multicolored printed products, wherein a special color is replaced by process colors using an ICC color profile. A measurement point that is assigned to the replaced special color on the printed product is metrologically acquired using a color measuring system and a Lab actual color value of the measurement point is calculated. The ICC color profile or a standardized ICC color profile is used for computing the color composition of the Lab setpoint color value from the participating process colors. Changes of the layer thicknesses of the participating process colors are ascertained to achieve a predetermined Lab setpoint color value of the measurement point using a digital tool or a digital model. The participating process colors are adapted using the ascertained changes of their layer thicknesses.

Method for adapting a lab setpoint color value of multicolored printed products

A method for the automated generation of reference color values for color control purposes in a printing machine by using a computer includes, within a process of setting up the printing machine for a print job, initially carrying out printing operations and using a spectrophotometer to determine coloration values for every process color used in the print job. For every process color that is used in the print job, the computer automatically selects that coloration value of a process color that has the smallest deviation from a color set point that has been established at the beginning of the job and saves this coloration value as a new reference value for this process color.

Method for automated generation of reference color values for color control

A method for correcting digitized image data in the prepress stage when using printing presses having a device-independent color profile in the main printing stage, having the following method steps:

Method for correcting unadjusted printing data on the basis of colormetrically measured reference sheet

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Schriesheim, Germany

Bernd Utter