Adjusting the image
Mirage M Series User Manual
95
020-101942-02 Rev. 1 (10-2018)
c. Confirm that you are using input on an Analog BNC card or a Dual Link DVI card. Input
Levels are not applicable for sources going through the decoder. Christie recommends a
grey scale.
d. 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. Enable Auto in the
Input Levels
menu. Wait for all six values to stabilize. Alternatively, do not use Auto; reduce black
levels 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
Auto Color Enable
option (described below).
e. Delete the Auto check mark and leave the Input Levels menu.
•
Auto Color Enable—
When a check mark is present, selecting a specific black level or drive to
adjust automatically enables the corresponding color in the display. Delete the check mark to
see all colors, or to enable a different specific color through the Color Enable control.
•
Clamp Location—
Brightens the image produced from certain high-resolution high-frequency
graphic sources. The projector automatically selects the best clamp location for most sources.
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 horizontal streaks are across the image,
or if there is significant color drift. This moves the clamping pulse from the normal back porch
location (which is likely too short) to the tip of the horizontal sync pulse.
Tri Level
is typically
needed for an HDTV source.
•
Input Peak Detector—
A tool to assist with defining individual input 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 grey. When used with a
smooth grey scale 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 black levels and input
drives until both black and white edges are
just
visible and distinguished from neighboring
pixels. Images from this source display correct blacks and whites without crushing.
a. Display a 16 level grey scale test pattern from the required external source and enter a
check mark in the
Input Peak Detector
checkbox. The Input Peak Detector initially
renders the grey scale as a uniform grey field before adjustment or extreme crushing.
b. Display one primary color. Select
Auto Color Enable
to ensure the correct color is
displayed for each setting.
c. For the current color, adjust its corresponding
Black level
slide bar just until a single
band of black appears at one edge of the screen. This band represents the first band of
the grey scale pattern, which should be 100% black.
d. With the same color still active, adjust its corresponding
Input Drive
slide bar
just until
a single band of color appears at the opposite edge of the screen. This band represents
the last band of the grey scale pattern, which should be 100% white (or the current color,
if a certain color is enabled).
e. Check the black band and adjust the black level slide bar if necessary. Adjusting the black
levels affects the gain. Only adjust when necessary.
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