Vivid VTS-4600, Operation Manual

Page: 44 / 75

Colour Temperature: Select Colour Temperature from the Video Settings menu to adjust the colour
temperature. Colour temperature establishes the
“ colour of grey” by adjusting the 75% white point to
various colour points.
What are
“colour points?”
A
“ colour point ” is an x/ y coordinate pair that defines a colour’s location on the
standard CIE chromaticity graph, shown in Figure 4-6. (CIE stands for
“ Commission Internationale de
l
’Éclairag e” (International Commission on Illumination), the organisation responsible for colour
measurement and m anagement standards.)
1.0
y 0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 x 1.0
Figure 4-6. CIE 1931 Chromaticity Diagram
Select a value of from 3200K to 9600K. Higher settings produce a
“ bluer” picture; lower ones impart a
reddish hue to the image. To select a custom colour temperature, select User and set the Gain and Offset as
described below.
Gain: Use the Gain controls to correct colour imbalances in the bright areas of the image. A good way to do
this is to use a test pattern consisting mostly of solid white areas, such as an 80 IRE
“ window ” pattern. If the
white areas contain traces of red, green or blue, decreas e the Gain for that colour.
Offset: Use the Offset controls to correct colour im balances in the dark areas of the image. A good way to do
this is to use a test pattern consisting mostly of dark grey areas, such as a 30 IRE
“ window ” pattern. If the grey
areas contain traces of red, green or blue, decreas e the Offset for that colour.
Aspect Ratio: To change the as pect ratio (size and shape) of the displayed image, select As pect Ratio from
the Video Settings menu and press ENTER . Select the appropriate as pect ratio for the type of
program material being viewed.
Note that some as pect ratios are unavailable and / or not useful with certain types of source material. The
optimal setting depends on a number of factors, such as:
• The aspect ratio of the source material, as broad cast or encoded on the playback medium.
• The “ display type” (16:9 or 4:3) and output resolution settings at the source component. Most modern
DVD /BD players and set-top boxes have such controls.
• Viewer preference (original aspect ratio with “ black bars,” or a full-screen presentation with some
distortion or cropping).
Yellow
an
ed
Blu
Green
Cy
D50
D65
D93
R
Magenta
e
1
0
0
0
0
8
0
0
0
6
6
6
7
5
7
1
4
5
0
0
0 4
0
0
0
3
3
3
3
2
8
5
7
2
5
0
0
2
2
2
2
2
0
0
0