Christie Mirage S+14K User Manual page 64

OPERATION
3-30
Roadster / Mirage S+ User's Manual
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3. Confirm that you are using an analog source not connected to
, as Input Levels are not applicable for digital sources or sources
INPUT 4
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.
When a checkmark is present, selecting a specific blacklevel
AUTO COLOR ENABLE –
or drive to adjust will automatically enable the corresponding color in the display.
Delete the checkmark to see all colors, or to enable a different specific color through
the Color Enable Control.
This option (formerly known as sync tip
CLAMP LOCATION –
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 needed for an HDTV source.
Select which color or colors you want to see in the display, useful
COLOR ENABLE –
while working with color temperature white levels or input levels.
The Peak Detector is a tool to assist with defining individual input
PEAK DETECTOR –
levels, enabling you to accurately set the Input Levels for any particular source with
the appropriate image. Enabling the Peak Detector activates a special operating mode
for detecting only pixels that are considered black or white—all other levels are
displayed as a mid-level gray. When used with a smooth grayscale pattern in which
black and white are known to be at opposite edges of the image, you can watch these
isolated areas while adjusting individual blacklevels and input drives until both black
and white edges are just visible and distinguished from neighboring pixels. Images
from this source will then display correct blacks and whites without crushing.
See Figure 3.15. Adjusting Input Levels Using the Peak Detector:
1. Display a 16 level grayscale test pattern from the desired external source, and
enter a checkmark in the Peak Detector checkbox. NOTE: The "Peak
Detector" will initially render the grayscale as a uniform gray field before
adjustment or extreme crushing.
or
INPUT 3