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  Video Projection Back

Vision : projection screens and projectors are just the beginning.  projection is both an art and a science, with the size and type of projector being party dictated by the audience and room sizes, and partly by the availability of adequate hanging points.  each projector has a focal distance, which determines how far from the screen it needs to be in order to fill that screen, and this changes with screen size.

At the 'back end' of projection, is all the equipment that creates the projected image.  the average m-audio visual india setup requires some form of seamless switcher (allows switching between two image sources, such as a dvd and presentation laptop, or to move back to the main presentation and a holding slide), multiple sources, such as laptop, dvd player and/or a live camera feed to screen, cueing monitors to allow the vision technician to view all sources that don't come with their own screens (ie: dvd players), a vision mixing console (if more than two sources are required to be mixed), a blackburst generator or genlock (if using multiple image sources with live camera), signal amplifiers, signal distributors and of course, hundreds of metres of specialist cabling.  as you can see, this is somewhat more complex than the average plug 'n' play boardroom presentation.

Also, where in the boardroom, a projector is generally aimed and adjusted to fit the screen, with larger setups using multiple projectors, the images must be colour balanced, not only to each other, but to the presentation material.  this is partly to do with the different ways lcd and dlp represent colour in contrast to your laptop or computer screen.  in some instances, multiple projectors may be overlapped or 'blended' to create one large image.  this is done with a combination of precise hanging and focusing, and special software which allows media to be run across multiple projectors. and of course, the person running all this equipment, with years of experience, skill and timing, unflappable and with an eye for symmetry and colour (more of an artistic quality than often credited) takes responsibility for what may be up to a million dollars worth of equipment installed into your venue for the evening!

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