Runco VX-8D operation manual CIE 1931 Chromaticity Diagram

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.

•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.)

1.0 y

0.9

0.8

0.7

0.6

0.5

0.4		D50				3333	2857	2500	2222	2000
D65					4000
D93			5714	5000
0.3	8000	6667
10000
0.2

0.1

0.0									0.9 x 1.0
0.0	0.1	0.2	0.3	0.4	0.5	0.6	0.7	0.8

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 4-2lists the x- and y-coordinates for each color temperature preset.

60 Runco VX-8d Installation/Operation Manual