Contrast - Christie PowerTool User Manual

Contrast

Contrast – Increases or decreases the perceived difference between light
and dark areas of your image (0-100). For best results, keep close to 50. If
contrast is set too high, the light parts of the image lose detail and clarity. If
the contrast is set too low, the light areas will not be as bright as they could
be and the overall image will be dim. For best results, start with a low value
and increase so that whites remain bright, but are not distorted or tinted, and
that light areas do not become white (i.e., are "crushed"). If the environment
lighting changes, an adjustment of Gamma is recommended (see below).
This control is not available when multiple projectors are selected, if a test
pattern is running, or if there is a video signal error.
Brightness – Increases or decreases the amount of black in the image
(0 to 100). For best results, keep close to 50. Start with a high value and
decrease so that dark areas do not become black (i.e., are "crushed").
Conversely, high brightness changes black to dark gray, causing washed-out
images. This control is not available when multiple projectors are selected, if
a test pattern is running, or if there is a video signal error.
Gamma Type – Identifies the gamma curve used for gamma adjustments:
Standard, 2.22, or custom.
Gamma – Determines what gray shades are displayed between minimum
input (black) and maximum input (white) for all signals. A good gamma
setting helps to optimize blacks and whites, while ensuring smooth
transitions for the "in-between" values utilized in other colors. Unlike
Brightness and Contrast controls, the overall tone of your images can be
lightened or darkened without changing the extremes. All images will be
more vibrant, while still showing good detail in dark areas.
PowerTool 2.1 User Manual
020-100035-03 Rev. 1 (12-2010)
Figure 4-8 Contrast
Section 4: PowerTool Interface
4-9