X-Rite 939, Руководство оператора

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C H A P T E R F I V E
5-38
Print Contrast
Print Contrast provides the ability to monitor the ¾ tone area
and is useful when determining the optimum printing density.
Print contrast is calculated using.
%PC =
D D
D
s t
s
−
×
100
where: D
s
= solid density; D
t
= tone density
To access the Print Contrast function:
1.
Use the Tab keys
$@
to highlight
Print Contrast
.
–
M A I N M E N U
–
↑
D o t / T o n e
T r a p
H u e / G r a y n e s s
P r i n t C o n t r a
↓
X — R i t e
9 3 9
— — — — — —
X X X X
* * * * * *
2.
Press the Enter key
#
to access the Print Contrast function.
Selecting Color
You can choose from two different methods using the print
contrast function.
Auto
measurement method measures all the
colors, then displays the most dominant color.
Single color
measurement method measures and updates the specific color
you selected.
NOTE: Two specific wavelength values will also appear in this list if
the specular wavelength option is set in the Density options.
To select color option:
1.
Press the Tab keys
$@
to highlight the color option area of
the screen. <
Change Color Mode
> appears in the user
dialog.
P r i n t C o n t . T A u t o
<
Change Color Mode
>
Paper
Solid
PC
V 37.0%
2.
Press the Enter key
#
to access the Current Color menu.
3.
Press the Tab keys
$@
to select color option and press the
Enter key
#
.
Measuring Paper
When you select print contrast minus paper from the
Configuration menu, you must provide a reading of the paper
Current color option