Techkon SpectroDens Manual page 27

1
K C M Y SLUR C+M
1. Measurement 2. Measurement
1
K C M Y SLUR C+M
A gray balance patch is composed of different
portions of Cyan, Magenta and Yellow. It does
not include black ink.
Manual TECHKON SpectroDens Chapter 2 – Measurement functions
2
K C M Y 80% 40% BAL
2
K C M Y 80% 40% BAL
For the display of dot area (or dot percen-
tage) in %, two measurements have to be
made: First the solid density patch and then
the %-patch, which is in this example a 80 %-
patch. The resulting dot percentage is in this
case 92 %; the referring dot gain is 12 %:
92 % - 80 % = 12 %
Should a solid density value be displayed
instead of the desired dot percentage value,
then the density measured first was signifi-
cantly higher than the second one. In this
case we recommend to delete the displayed
value by pressing the red Escape button and
to measure again.
When making a measurement on a gray
balance patch, the referring density values
for all four process colors are shown in a
bar graph. The values for Cyan, Magenta and
Yellow should be in close range to each other
to ensure a neutral gray balance without a
color hue.
It is important that the gray balance patch, on
which the measurement is taken, comprises
the right %-values to achieve a neutral gray
when printed correctly. The process standard
ISO 12647 for offset print defines the values
as:
C = 50 %,
M = 40 % and
Y = 40 %.
The value for Black indicates how dark the
gray color is. The higher the value for Black
(= K) the darker the sample.
Page 27