Runco Video Xtreme VX-44d Installation & Operation Manual page 82

Operation
• 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.
You can also perform this task using the VX-44d/-55d built-in
Note
keypad. For more information, refer to Working With the Lamp
on page 49.
• Mode: With the VX-44d/-55d, two lamp adjustment modes are available: Power or
Intensity. The two modes are mutually exclusive; when you select the Power mode,
the Intensity selection in the Lamp menu is grayed out. Likewise, when you select
Intensity, the Power selection is grayed out.
• Power: To supply a constant wattage to the lamp, select Mode from the Lamp
menu and set it to Power. Then, select Power from the Lamp menu to set the lamp
power level. You can choose to run the lamp as bright as possible (this is the default
setting) or you can choose a lower setting. Generally, lower lamp output prolongs
the life of the lamp, but decreases brightness.
• Intensity: To maintain a constant brightness level, select Mode from the Lamp
menu and set it to Intensity. Then, select Intensity from the Lamp menu to specify
the desired brightness level. The projector automatically adjusts the amount of
power applied to the lamp as needed to maintain the desired brightness level.
The Intensity value is not the actual lumen output, but rather a
Note
correlated value only—1246 may represent 3500 lumens, for
example.
• 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.)
66 Runco VX-44d/-55d Installation/Operation Manual