Dot gain curve
After all settings are done, we can start with
the measurements on the gradation wedge.
The wedge is measured patch by patch. The
0 % and the 100 % patch are not measured;
these are the fixed corner points of the
curve.
In our example the first measurement is
on the 2 % patch, then follows the second
measurement on the 5 % patch,..
A faulty measurement can be undone by
pressing the red Escape button: The last
measurement will be deleted and the device
is ready to measure again.
After all measurements are done the „soft
key“
Transfer curve
in the upper right
corner can be activated. This will switch the
display to the mode where the complete
curve is shown.
The Arrow-buttons allow navigation from
value to value. The gray shading marks the
area of values within the tolerance range.
Measurement values out of tolerance are
marked as crosses.
The measurement function
Dot gain curve
is closely related to the function previously
descibed.
Now, the difference between measured dot
value and reference value is drawn in a graph.
In this example the measured dot area is
45,4 %; on a 50 % reference patch. Thus
the dot gain is 45,4 % - 50 % = -4,6 %.
In this special cas the dot gain is a dot „loss“,
because the value is negative.
1. 2. 3 . 4. ...measurement
„Soft key“
Transfer curve
Difference between
measurement value
and target value
Dot per- reference- Dot-
centage value gain
- =
Manual TECHKON SpectroPlate Chapter 2 - Measurement functions
Page 21
