Christie Entero RPMWU User Manual page 47

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
Select 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.
NOTE: 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. See Figure 3-8. 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. Typically standard or 2.22 is used for all sources. Alternatively, if neither default is ideal, apply a
simple gamma curve by defining a custom power function and slope. Select Custom to enable the function and
slope controls. 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).
NOTE: If any of these special user curves have been installed, their names will appear in the Gamma Table
drop-down list.
• Gamma Function
Defines the base gamma power curve used when the base gamma table value is set to "custom". This value,
combined with gamma slope setting determines the base gamma table to be 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.
Entero RPMWU/RPMSP/RPMHD-LED01 User Manual
020-100367-05 Rev. 1 (06-2012)
Section 3: Operation
Figure 3-8 Gamma Curve
3-27