Method for converting spectral characterization data

摘要

A method controls the coloring of a printing press. In the method a test element is printed with a number of colored measuring areas. The printed colored measuring areas of the test element are then measured. Actual colorimetric values are calculated from the measured color values and then displayed. Reference colorimetric values are entered and adapted spectral color values are calculated. Densitometric, colorimetric, or spectral actual tonal values or actual tonal value gains are determined from the calculated actual colorimetric values of a subset of the colored areas of the test element. The densitometric, colorimetric or spectral reference tonal values or the reference tonal value gains are entered and adapted spectral color values are calculated by a comparison with the calculated actual colorimetric values. The adapted spectral color values for the calculation of color profiles, process calibrations and process control values are stored and the printing press is activated.

主权项

1. A method for controlling coloring in a printing process of a printing press by using a computer, which comprises the steps of:
printing a test element with a selected number of colored measuring areas; measuring the colored measuring areas of the test element with a spectrophotometer; calculating actual colorimetric values from measured color values from the colored measuring areas of the test element; displaying selected actual color values on a display apparatus; entering reference colorimetric values and calculating adapted spectral color values from the reference colorimetric values; calculating densitometric, colorimetric or spectral actual tonal values or actual tonal value gains from calculated actual colorimetric values of a subset of the colored measuring areas of the test element measured with the spectrophotometer, and displaying on a display device; entering densitometric, colorimetric or spectral reference tonal values or reference tonal value gains and calculating adapted spectral color values by means of comparison with the calculated actual colorimetric values; and storing the adapted spectral color values for a calculation of color profiles, process calibrations and process control values and activating the printing press on a basis of the color profiles, the process calibrations and the process control values.