Dot Area - Techkon SpectroDens Manual

Dot Area

For the function Dot Area (= dot percentage) two measurements have to be carried
out. First a measurement on a solid patch and then a measurement on a %-patch
(= screen patch). The dot area value is calculated with the Murray-Davies formula.
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Manual TECHKON SpectroDens Chapter 2 – Measurement functions
1. First place the measurement head above
a solid patch and start the measurement by
pressing the green button. The solid density
value will be displayed.
2. Now make a second measurement on
a %-patch and the dot area in % will be
shown.
In this case a measurement has been taken
on a 40 %-patch.The resulting dot gain can be
easily calculated:
53,6 % - 40 % = 13,6 %
The dot gain value gives the information to
what degree a point is enlarged (or decrea-
sed) during each process step of the repro-
duction process chain.
The double arrow on the left side of the
device display indicates which measurement
has to be done next.
Should several dot area values refer to
the same solid density, this value has to be
measured only once and can be saved for
consecutive %-measurements. After a solid
density measurement, just keep the Enter
button pushed for approximately 3 seconds
until the density value is framed. Now an
unlimited number of %-measurements can
be made. Deactivating is done by keeping the
Enter button pressed again.