Christie DS+60 User Manual page 65

System Configuration
DIAGNOSTICS / CALIBRATION
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Test Pattern
Choose the desired internal test
pattern to display or select OFF to
turn off a test pattern.
Alternatively, use the
cycling through test patterns.
Test Pattern Gray Level
Set the desired level of gray for
displaying in the full gray field test
pattern.
Freeze Image
Enter a check mark to freeze (stop) an image on a single frame. This diagnostic tool is
useful if you need to examine in detail a still version of an incoming image that cannot
be "frozen" at the source. For example, in moving images it is sometimes difficult to
observe artifacts such as external deinterlacing/resizing and signal noise. Remove the
checkmark to return back to normal.
Color Enable
Select which color or colors you want to see. This is useful while working with color
temperature, input levels or other special setup parameters. Colors can also be
enabled/disabled by entering the corresponding function code listed on the back of the
standard remote keypad.
Odd Pixel Adjustment
NOTES: 1) Factory-set and rarely required by user. 2) Source must be >110 MHz.
When using certain RGB sources, you may need to adjust the normal gain or offset of
odd pixels in relation to even pixels. This will smooth out very narrow (1-pixel wide)
"checks" or vertical stripes that indicate adjacent "on" and "off" pixels. Although
offset and gain slidebars can be adjusted individually and manually, using the Level
Detector simplifies this process (see Figure 3.21):
1. Use an external analog native-sized continuous grayscale test pattern with at
least 256-levels.
2. Turn "Level Detector" on.
3. Set "Level Value" to ~200. The image should now be black-and-white (or
black-and-one color, if you use "Color Enable" function).
4. Adjust offset. Half of the pixels will move, the other half will not.
5. Adjust until the two transition regions overlap. The stripe of noise will be
minimized, defined by the value in the slidebar.
6. Set "Level Value" to ~800. The image should now be black-and-white.
7. Repeat Steps 4 and 5, but adjusting gain.
8. Repeat Steps 3-7 for all remaining colors. Your RGB source should now be
OK.
key for
Test
Section 3: Operation
Christie DS+60 User's Manual 3-41