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Pixel tracking adjusts the frequency of the pixel sampling clock, indicated by the
number of pixels per line, so that all pixels generated by a particular source are
sampled. Proper pixel tracking ensures consistent image quality–whether good or
poor–across the screen, proper aspect ratio and enables optimization of pixel phase
(below).
NOTE: By default, the projector will sample at the correct frequency for most sources.
Make sure that pixel tracking is set to 1424 or higher for 3D images.
Pixel tracking is adjusted most effectively using a good test pattern, such as a smooth
gray consisting of a clear pattern of tiny black and white dots, or a similar "half on,
half off" graphic image, such as the Windows™ shutdown screen. Steady flickering
or several soft vertical stripes or bands across the entire image indicates poor pixel
tracking. Adjust the slidebar until the stripes broaden to the point where one large
stripe fills the image. Again, the image may still exhibit some noise. See Pixel Phase.
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Pixel phase adjusts the phase of the pixel sampling clock relative to the incoming
signal. It is used primarily for adjusting RGB inputs.
NOTE: Adjust pixel phase after pixel tracking is properly set.
Adjust pixel phase when the image (usually from an RGB source) shows shimmer or
"noise". Pixel phase adjustment is done most effectively from within a proper test
pattern, such as a smooth gray consisting of a clear pattern of tiny black and white
dots, or a similar graphic image, such as the Windows™ shutdown screen. Adjust
until the image is stable and each dot is clearly defined. Using the numbers on the
slidebar as a guide, you will notice that you can actually stabilize the image at more
than one point—i.e., you may find that the image appearance at "11" is identical to
the image appearance at "38", thus you can select either setting.
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Filter applies a low pass filter to the input signal. This removes high frequencies
which can improve pixel phase noise but which also reduces signal bandwidth. Note
that most signals will not require any filter adjustment—use the filter option only if
standard pixel tracking and phase adjustments do not adequately clear up a "noisy"
signal. For best results:
1. Optimize Pixel Tracking and jot down the
value.
2. Optimize Pixel Phase
3. If the image is still too noisy, return to Pixel
Tracking and "mis-adjust" so that 2 vertical
bands of noise appear, separated by a good
center band. See right.
and adjust the top slidebar.)
and adjust the bottom slidebar.)
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