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Thread: Seamless

  1. #1

    Seamless

    Hi guys,

    We're going to tour with the following and i'm wondering if this will work in theory : 2 beamers on a pipe focused without the need of keystone because they are on axis. They will be overlapping in the middle for the seamlessby using blend mode. The height off the pipe will always be the same but the distance to the screen will vary. The image width can stay the same because of the zoomlens. Can i calculate the distance between the beamer in relation to the blend % which we did in the rehearsals so that the only thing we have to change is the horizontal position on the pipe?

    Thanks!

  2. #2
    Ideally, if you are on axis and adjust the zoom lens only then theoretically the blend will overlap the same each time.

    Let's imagine your projectors are 3 meters apart. Each image will be 4 meters wide. The total image will be 7 meters wide with a 25% blend.

    If the axis of each projector is parallel on a horizontal plane then as long as you zoom the projectors to be 4 meters wide, your total image will always be 7 meters wide and your blend will always be 25%.

    An issue you haven't considered is the blend curve in catalyst. Yes the blend % will always be the same but you will have to change the blend curve each time the distance changes. This is because the feathering of the edges is inversely proportionate to angle of the projection.

    Basically, if the projectors are further from the screen (long throw) then the blend curve will be closer to linear. If the projectors are closer however, the blend curve becomes much more quadratic.

    Don't worry though. You'll see what I mean and honestly, it's not a complex change.
    SourceChild
    TODD SCRUTCHFIELD

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