Installation manual

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C3X LINK
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GAMMA CORRECTION
Determines the system’s response to the grey scale, emphasi-
sing or attenuating the different levels of brightness (blacks, dark,
medium, light greys, whites) forming the projected image.
The projector has several gamma functions to display any
image in the best way for the type of video source applied,
the conditions of environmental brightness and the subjective
preferences of the observer.
There are 4 groups of gamma curves: Standard (ST), Enhanced
SIM2 (EN) and Graphics (GR), User. The Standard curve has been
defined for general use for various images from sources such
as video cameras, digital cameras, and for displaying films or
photographs from a personal computer. The Enhanced group is
suited to display cinema material. The Graphics group is suited
to display graphics (desktop PC, CAD, PC presentations,…).
Selecting the User setting defines the curve according to pa-
rameters. The user can then select the coefficient determining
the curve. Coefficients of between 1.5 and 2.2 emphasise the
detail in dark images but reduce the global perception of the
contrast. Values higher than 2.2 increase the global percep-
tion of the contrast but attenuate the perception of detail in
the dark areas of the image. With the most common video
sources, overscan values can be between 0 (no overscanning)
and 32 (maximum overscanning). The resulting image always
maintains the selected aspect irrespective of the selected
overscan value.
POSITION
Use this adjustment to position the image vertically and horizon-
tally. Determines the aspect ratio of the projected image.
These parameters do not normally require adjustment because
the system checks the input signal and automatically sets the
most suitable values. However, if the image is not perfectly
centralised it may prove useful to request the system to repeat
the input signal analysis and image positioning, calling the
automatic control procedure with the A key on the remote
control or the AUTO key on the keypad. When this procedure is
called it is helpful to have a while or light coloured background
on the screen in the current picture. If the image positioning
obtained in this way is not satisfactory, it is then wise to use the
position control.
FREqUENcy/pHaSE
These adjustments, available for progressive signals and for si-
gnals from a PC, ensure correspondence between the number
of pixels making up the signal and the number of pixels that
make up the projected image.
These parameters do not normally require adjustment because
the system checks the input signal and automatically sets the
most suitable values. However, if the image appears disturbed
ST1 For general use.
EN1 Suited to display images from a video
camera, digital camera or television
studio in conditions of high environmental
lighting.
EN2 Suited to display images from a video
camera, digital camera or television
studio in conditions of poor environmental
lighting.
EN3 Suited to display cinema material
in conditions of very high environ-
mental lighting from the surroundings.
EN4 Suited to display cinema material in
conditions of medium environmen-
tal lighting from the surroundings.
EN5 Suited to display cinema material in
conditions of controlled environmental
lighting.
G1 Suited to display graphic images (e.g.,
Windows Desktop) in conditions of me-
dium environmental lighting.
G2 Suited to display graphic images in
conditions of controlled environmental
lighting.
Table 5 - setting gamma correction
Gamma Functions
Standard
Gamma Functions
Enhanced SIM2
Gamma
Graphics
Functions
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