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Good RGB or input
levels—that is, the
drives and blacklevels
for each of the three
colors, red, green and
blue—ensure that
images from analog
sources other than
decoded video have
maximum contrast
without crushing black
or white. By default
(and in an "Auto
Setup" from the Main menu), the projector automatically determines the best input
levels by monitoring image content and adjusting the controls appropriately—further
adjustment is typically not required to obtain proper blacks or whites. NOTE: This
automatic adjustment requires at least 1 white pixel in the image. Without a white
pixel, input levels may produce skewed colors, particularly in non-video images.
However, for a very unusual source exhibiting overly high blacklevels (most often
caused by a noisy source that causes blacklevel spikes), an experienced user may
prefer to use the Input Levels menu (see Figure 3.22). These adjustments, which are
actually a calibration process to compensate for differences in sources and cabling,
enables an experienced user to perfect the source image input levels. Note that Input
Levels are of limited use with digital signals, but offer some ability to tweak poorly
mastered source materials.
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checkmark only if you are an experienced user and you have an unusual source that
you feel needs further color temperature and/or input level adjustment. After entering
a checkmark, wait for the six values to stabilize, then delete the checkmark and exit.
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1. Make sure overall Contrast and Brightness are both set to near 50.
2. Check the color temperature setup using an internal grayscale test
3. Make sure you are using an analog source not connected to
4. If the blacks and/or whites appear OK, input levels do not need
5. Temporarily enable "Auto" in the Input Levels submenu. Wait for all 6
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Keep off for virtually all sources (default). Temporarily enter a
To check your image and adjust these controls:
NOTE: Not required for "Auto" adjustment.
439
N
= 50 (approx.)
N
= 50 (approx.)
pattern, adjusting as desired to obtain a neutral grayscale. NOTE: Not
required for "Auto" adjustment.
, as Input Levels are not applicable for digital sources or sources
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going through the video decoder. A grayscale is recommended.
adjustment. If black levels are too high (and/or whites are too low, which
is rare), you likely have a noisy source that is producing skewed input
levels. Continue with Step 5.
values to stabilize. Alternatively, do not use "Auto"—reduce blacklevels
manually instead. Judge by eye and change one or more of the six levels
as necessary to obtain proper blacks and whites. You may want to see
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or
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