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C3X Lumis HOST
15
If the default white balance settings are not sufficient, you can
adjust the white balance manually.
Colour temperature can be adjusted by positioning the white
point within the CIE chromaticity diagram. The system permits
you to place the white point inside a grid positioned in the neu-
tral colour zone. Moving along the horizontal lines changes the
related colour temperature, with low temperatures on the right
(thus increasing the red content) and high temperatures on the
left of the graph (thus increasing the blue content). Points along
the yellow horizontal line represent the colours on the black
body curve. The colour temperature along the vertical lines is
constant but differs to a lesser or higher degree from the black
body curve. This means that by selecting the points on the
higher part of the graph you will increase the blue content. On
the contrary, by selecting points in the lower part of the graph,
you will increase the purple content.
Gamma Correction
Determines the systems response to the grey scale, emphasis-
ing or attenuating the different grades of brightness (blacks, dark,
medium, light greys, whites) in the projected image.
The projector has a range of gamma functions which enable
you to display any image to the best effect for the type of video
source, the ambient lighting and your subjective preferences.
There are 3 sets of gamma curves: Standard (ST), Enhanced
SIM2 (EN) and Graphics (GR). The Standard curve has been
defined for general use, and is set for video cameras, digital
cameras, and for viewing films or photos from your PC.
The Enhanced set is suitable for watching movies. The Graphics
set is suited to displaying synthetic graphics (PC desktop, CAD,
PC presentations, etc.).
By selecting User you can define your own curve. You can thus
select the coefficient which determines the curve. Values from
1.5 to 2.2 allow you to emphasise the detail of dark images,
but reduce overall contrast. Values higher than 2.2 increase
overall contrast, but reduce the detail of dark areas. For the
most common video sources, by setting the value to 2.2 you
can achieve pleasant and well-contrasting images.
POSITION
Use this adjustment to position the image vertically and horizon-
tally. It 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, by requesting the automatic control
procedure with button A on the remote control or the AUTO
button on the keypad. When this procedure is requested, it is
helpful to project a picture with a white or light-coloured back-
ground on the screen.
FREQUENCY/PHASE
These adjustments, available for progressive signals and for
signals 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.
If however the image is disturbed (loss of resolution between
equidistant vertical bands or instability and lack of detail in thin
vertical lines) it may help to ask the system to rerun the input
signal analysis and set the best parameters by requesting the
automatic adjustment function with button A on the remote
control or AUTO on the keypad.
OVERSCAN
Eliminates irregularities around the outer borders of the
image.
Some less accurate sources may produce an image with
uneven borders; thanks to the overscan function these
GAMMA CORRECTION SETTINGS
Standard
ST1 For general use.
Enhanced SIM2
EN1 Suitable for displaying images from camcorders,
digital cameras or TV studios in bright ambient
light.
EN2 Suitable for displaying images from camcorders,
digital cameras or TV studios in poor ambient
light.
EN3 Suitable for projecting films in bright ambient
light.
EN4 Suitable for projecting films in moderate ambient
light.
EN5 Suitable for projecting films in controlled ambient
lighting conditions.
Graphics
GR1 Suitable for displaying graphic images (e.g.
Windows Desktop) in moderate lighting condi-
tions.
GR2 Suitable for displaying graphic images in control-
led lighting conditions.
DYNAMIC BLACK
The C3X Lumis HOST Projector allows for custom picture
contrast settings through both its “Variable Iris”, set to ac-
commodate the environment viewing light conditions, and
by enabling the “Dynamic Black” function. The latter setting
enables another dynamically controlled iris that reacts to the
image content by considerably increasing the black level
thus achieving better picture depth and detail in mid to low
brightness scenes.
By enabling the Dynamic Black function in conjunction with
the Variable Iris setting, you will obtain the best possible
picture quality based on the installation light conditions.
C3X Lumis HOST_ EN.indd 15 11-02-2009 14:40:33