The setting of the Yule-Nielsen factor is done
in the settings window of the measurement
conditions. If there is no information about
the factor available from the documentation
furnished with the plates, we recommend to
keep the value in a neutral range at n = 1.00.
The measurement is performed as known
from measuring on printed paper:
1. First, calibrate on a light, not imaged area
of the printing plate, as it would be a paper
white calibration.
2. Now measure a dark, 100 %-imaged patch.
SpectroDens will select one of the four CMYK
channels where the contrast signal is highest
depending on the color shade of the plate. In
this case the Cyan channel gave the highest
signal, because the plate is blue/violet.
3. Now the measurement on a %-patch is
carried out and displayed. Additional %-mea-
surements can be easily made. It is not neces-
sary to measure the solid density again, be-
cause it is already saved, which is indicated by
the frame around the value.
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