The module itself has an easy-to-use interface and takes away a lot of the complex math and calculations usually necessary to accomplish a good edge blend across multiple projectors.īecause the Edge Blending Module makes use of a Matrox DualHead2Go or TripleHead2Go, you are limited to up to 3 projectors at this time. The ProPresenter Edge Blending Module makes use of the Matrox DualHead2Go or TripleHead2Go to output 2 or 3 separate images that have the data-doubling and edge-feathering already done. At the high end, you could spend $50,000 or more depending on the quality of the image you are trying to create. At the low end, this requires an additional investment of around $1,500 per projector. In the past, the process of creating this kind of edge blend required the use of special equipment, such as video scalers or multi-channel video processors. "Feathering the edge"compensates for this: the data-doubled portion of the left projected image is manipulated to gradually fade to black, while the data-doubled portion of the right projected image is gradually faded in from black. The area in which the two projected images overlap is going to be brighter than the areas projected uniquely be each projector, which will create a brighter "hot spot" at the overlap point. Using two projectors as an example, the right edge of the left projector shares the same information with the left edge of the right projector. The first is called "data doubling" and consists of duplicating content on the projectors used. The seams are visible, and create a distraction for the audience who can see the lines between the two projectors. In practice, this doesn't work very well because it is nearly impossible to line the projectors up side by side to form a seamless image. Most people think that if you have two projectors and send the left half of an image to one projector and the right half of an image to the other projector, that you can just butt the two projected images next to each other to create a seamless image. The ability to create visual images on a wider canvas makes for a more compelling visual experience that make people take notice. Edge blending is the practice of using two or more projectors to create a single seamless image.
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