Front and Rear Projection
Simply put, front projection is what we are all used to – a white screen with a projector in front of it. Rear projection is a handy technique where the projector is located behind a translucent screen.
Rear projection screens are usually made out of a mid-grey PVC fabric however lighter and darker grey varieties as well as blue rear projection screens are available with different properties. Modern rear projection surfaces are very well made and perform very well against the undesirable effects such as “hot spots”. This is the effect of looking through the rear screen towards the projector and the centre appearing brighter as you look into the light from the lens.
Rear projection is often favoured in events as the projector can be neatly hidden away backstage instead of sitting in or hung above the audiance. Disadvantages include brightness because a certain percentage of the light of the projector is reflected off the back of a rear screen – a rear projection is never as bright as the same front projection on a white screen. Depending on the quality of the surface used, colour reproduction may also be affected if the surface is not true grey but slightly biased to a particular colour.