Correcting Gamma Settings; Adjusting The Sharpness Of The Image - Christie Mirage M Series User Manual

f. Repeat Steps c-d with the two remaining primary colors. When each primary color shows
one optimized black band and white (or colored) band, the input levels for this source are
correctly set. Upon exiting the Input Levels menu, the Peak Detector check box clears.
• Color Enable—Select which color or colors you want to see in the display, useful while working
with color temperature white levels or input levels.

Correcting gamma settings

The system offers two types of gamma correction in Image Settings > Advanced Image
Settings > Gamma Settings. Gamma correction can be applied to a specific source to correct for
luma encoding. This is a channel setting and reapplied every time the same signal is detected. This
is the Gamma control. On the other hand the system also provides a global Gamma Correction
control. The global control offers an offset applied to all channels. This offset is used to compensate
for changes in ambient conditions such as ambient light in the room and projected material.
• Gamma—Sets the base gamma table for a given source. Select from one of the standard
tables, a custom gamma function, or select an arbitrary gamma table that has been
downloaded to the projector. A separate PC utility is needed to do this.
The 2.22 curve is a power curve typically used to encode graphics and video sources. The
standard curve (auto setup default) is a modified 2.22 curve with a small linear section in the
black that enhances the detail in darker areas of the projected content.
Alternatively, if neither default is ideal, apply a simple gamma curve by defining a custom
power function and slope. For more complex non-standard gamma curves, a user-defined curve
created externally and downloaded to the projector can be used (requires separate PC-based
Arbitrary Gamma software application to create the table and the Web UI to download it). If any
of these special user curves have been installed, their names appear in the Gamma Table pull-
down list.
Select Gamma Function from the list to enable the Gamma Function and Gamma Slope
controls.
• Gamma Correction—Applies a global offset to all gamma settings for each channel. It affects
the shape of the curve by performing a linear transform toward a gamma curve of 1.0 while the
control is increasing and likewise a linear transform toward a gamma of 3.0 as the control is
decreasing. The control should only be adjusted to compensate for ambient conditions. To
correct a particular source only, use the Gamma control.
• Gamma Function—Defines the base gamma power curve used when the base gamma table
value is set to Gamma Function. This value, combined with gamma slope setting determines
the base gamma table used as the custom base table. The curve is generally a power curve
with a small linear segment at the bottom defined by the slope.
• Gamma Slope—Defines a slope to be used for the base custom gamma table for a small
section at the bottom of the curve. This slope brings in or out the low level blacks in the image.

Adjusting the sharpness of the image

Setting detail above the halfway-point can introduce noise in the image. Lower settings can improve
a noisy signal. This command does not take effect unless the minimum change required in the
Detail Threshold control is reached.
Mirage M Series User Manual
020-101942-02 Rev. 1 (10-2018)
http://www.pureglare.com.au
Adjusting the image
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