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Section 3: Operation
3-44 Christie DS+60/DW30/Matrix 3000 User's Manual
enabled/disabled by entering the corresponding function code listed on the back of the
standard IR remote.
Odd Pixel Adjustment
NOTES: 1) Factory-set and rarely required by user. 2) Source must be >90 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. Using the
Level Detector simplifies this process (see Figure 3.23):
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.
Two sets of values are automatically saved with these controls—one value for Input
#1, and one for Input #2 (analog). The current set of values depends on which source
is in use. This enables a source to be processed correctly via 2 different inputs.
Figure 3.23. Using "Odd Pixel Adjustment"
NOTES: 1) Adjust offset before gain, since offset affects gain. 2) A value of 128
represents no change in normal odd pixel offset or gain. 3) Odd Pixel Adjustment
eliminates "1 pixel on, 1 pixel off" artifact only, not any type of larger artifacts.
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