Christie roadie 25k User Manual page 87

eliminate the "overshoot" and "undershoot". Note that Input Levels are of limited use
with digital signals, but do offer some ability to tweak poorly mastered source
materials.
AUTO INPUT LEVEL –
Keep off for virtually all sources (default). Temporarily enter a
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 slidebar values to stabilize, then delete the checkmark
and exit. This compensates for incoming out-of-range drives (white) and blacklevels
(black) that would cause "crushing" of light and dark colors in the image.
BLACKLEVELS AND DRIVES -
1. Make sure overall Contrast and Brightness are both set to near 50.
NOTE: Not required for "Auto" adjustment.
•
Cont
•
2. Check the color temperature setup using an internal grayscale test
pattern, making sure to obtain a neutral grayscale. NOTE: Not required
for "Auto" adjustment.
3. Confirm that you are using an analog source not connected to
INPUT 4
, as Input Levels are not applicable for digital sources or sources
going through the decoder. A grayscale is recommended.
4. If the blacks and/or whites appear OK, input levels do not need
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.
5. Temporarily enable "Auto" in the Input Levels submenu. Wait for all 6
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
only a certain color while adjusting—use the "Color Enable" option
(described below).
6. Delete the "Auto" checkmark and leave the Input Levels menu.
IMPORTANT: Do not use Input Levels to adjust color temperature. This will
distort Contrast and Brightness functions as well as color temperature.
AUTO COLOR ENABLE –
or drive to adjust will automatically enable the corresponding color in the display.
Delete the checkmark to see all colors.
CLAMP LOCATION –
This option (formerly known as sync tip
clamping) can brighten the image produced from certain high-
resolution high-frequency graphic sources. For almost all sources,
the best clamp location is automatically selected by the projector.
Use the normal Back Porch location if the image is either sufficiently bright or overly
bright. Select Sync Tip if the image appears unusually dim, if there are horizontal
streaks across the image, or if there is significant color drift. This moves the clamping
pulse from the normal backporch location (which is likely too short) to the tip of the
horizontal sync pulse. Tri Level is typically recommended for an HDTV source where
the back porch is also short.
To check your image and adjust these controls:
= 50 (approx.)
= 50 (approx.)
When a checkmark is present, selecting a specific blacklevel
OPERATION
INPUT 3
Roadie 25K User's Manual
or
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