Operation
60 Runco VX-8d Installation/Operation Manual
PRELIMINARY
•Gamma: Select Gamma from the Display Color menu to choose a de-gamma curve.
Used correctly, the Gamma control can improve contrast while maintaining good
details for blacks and whites. If excess ambient light washes out the image and it
becomes difficult or impossible to see details in dark areas, lower the gamma setting to
compensate. This improves contrast while maintaining good details for blacks.
Conversely, if the image is washed out and unnatural, with excessive detail in black
areas, increase the setting.
•Lamp: Select Lamp from the Display Color menu to adjust the projector lamp
brightness.
•Power (230W or 260W): To supply a constant wattage to the lamp, select Power
(230W or 260W) from the Lamp menu to set the lamp power level. You can choose
to run the lamp as bright as possible (260 watts; this is the default setting) or you
can choose a lower setting (230 watts). Generally, lower lamp output prolongs the
life of the lamp, but decreases brightness.
•Color Temp: Select Color Temp from the Display Color menu to adjust the color
temperature. Color temperature establishes the “color of gray” by adjusting the 75%
white point to various color points.
What are “color points?” A “color point” is an x/y coordinate pair that defines a
color’s location on the standard CIE chromaticity graph, shown in Figure 4-7. (CIE
stands for “Commission Internationale de l’Éclairage” (International Commission on
Illumination), the organization responsible for color measurement and management
standards.)
Figure 4-7. CIE 1931 Chromaticity Diagram
•Simple: Select Simple mode from the Color Temp menu (with the VX-8d, this is the
only choice) to choose one of four color temperature presets: 5500K, 6500K, 7500K
and 9300K. The default setting, 6500K, is appropriate for most situations. Higher
settings produce a “bluer” picture; lower ones impart a reddish hue to the image.
Table 4-2 lists the x- and y-coordinates for each color temperature preset.
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
x
y
2000
2222
2500
2857
3333
4000
5000
5714
6667
8000
10000
D50
D65
D93