User Manual
14
SCREENS FOR PROFESSIONALS
SCREENS FOR PROFESSIONALS
Deļ¬ning image quality
The ultimate purpose of a projection screen is to ensure that the quality of the projected image is reflected toward
the audience while maintaining or even improving the projection in brightness or contrast. There are several
factors which determine the perceived quality and which should be taken into account when selecting a particular
projection screen and projection surface. All these factors play an important role and need to be tuned to each
other to create the optimum projection.
Ambient Light
Ambient light is the amount of unwanted light in a room that can affect the projection in a
negative way. Ambient light can come from windows or from room lighting. Ambient light
on a projection screen causes a less bright image. This can be countered by using window
blinds to darken the room, using a projector with a stronger light output or using a
projection surface with a higher gain.
Projector Characteristics
Output (ANSI-lumen)
The brightness of a projector is measured in ANSI-Lumen. The higher the number of
ANSI-Lumen, the brighter the projected image and the more it can compensate for
ambient light. Please note that a too bright image is not pleasant to look at for a longer
period of time.
Projector position
A projector can be placed in front of or behind a projection screen. The projector can also
be mounted on the ceiling or placed at table height. A projection surface has a specifically
designed coating that handles the light that hits it, which makes it necessary to pay
attention to your choice of projection surface type.
Lens-type
The specific lens of a projector determines the distance between the projector and the
projection screen, which is the throw distance. If a short throw or ultra short throw lens is
being used it is important to use a tensioned projection surface. Using a short throw or
ultra short throw lens decreases the distance between the projector and the projection
screen. This however also creates a situation where the projected light reaches the
projection surface at an extreme angle, which is why we recommend using a tensioned
projection surface to avoid distortion of the image.
PROJECTA ACADEMY