Runco CX-70DHD 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.

•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 CX-70DHD, this

is the only choice) to choose one of three color temperature presets: 3200K, 5500K or 6500K. The default setting, 6500K, is appropriate for most situations. Higher settings produce a “bluer” picture; lower ones impart a reddish hue to the image.

CX-70DHD Installation/Operation Manual 49