Christie DLV1280 DX User Manual page 8

INSTALLATION & SETUP
Using a 5:4 Screen (recommended)
With one exception, XGA images will—
by default—resize to 5:4 and fill an
SXGA screen. The exception (illustrated
in Figure 2.3) is that video signals will
retain their 4:3 aspect ratio—to fill the
screen, increase Vertical Stretch in order
to slightly expand the image at the top
and bottom. For details, see 3.6,
Adjusting the Image. Figure 2.3. Adjusting a Video Image
Using a 4:3 Screen
If you are using a 4:3 screen, images will—by default—slightly overlap the screen
vertically. To remedy, reduce Vertical Stretch so that the "too tall" 5:4 image no
longer spills over the top or bottom of the screen (Figure 2.4). This control eliminates
the need for simply moving the projector father from the screen, which would result
in black borders for all sources. See 3.6, Adjusting the Image for details.
NOTE: The Vertical Stretch adjustment may soften the image slightly, but is rarely
noticeable.
Figure 2.4. Using a 4:3 Screen for a Mix of 5:4 and 4:3 Images
Ideal Room Lighting
'
The high brightness output of this projector is certainly well suited for locations
where ambient lighting is less than optimum for projection, yet there are still many
simple things you can do to further optimize your installation.
Visiting a movie theater can give you an idea of what makes an ideal projection
environment. Walls, floors and furnishings are dark and matte finished. A projection
room should not have white reflective ceilings or non-directional lighting such as
fluorescent lights. The white ceiling spreads light, making the room appear brighter.
Keep lighting and reflections to a minimum.
If it is not possible to eliminate fluorescent lights, consider using incandescent spot
lighting or parabolic reflectors ("egg crates") to direct light down to the floor. Light
dimmers or rheostats allow further control.
Outside windows are undesirable in any projection room. A small crack between
curtains on a sunny day can wash out a projected image. If you do have windows,
make sure that window coverings are opaque and overlapping — some window
coverings are designed to provide up to 100 percent blockage of outside light.
Ideally, the material should have a matte finish.
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DLV1280 DX User's Manual