You've succesfully started to blend your projectors! The next step is the warping to geometry correct for your surface and projected angle - You'll want to turn on the internal Qlab grids for this so you can match up the lines and the text - don't be afraid to adjust your overlap amount to make it work: Next, overlap those two projector squares (one is green, one is blue) until they roughly match the overlap of your projectors: I've mocked this up in Qlab 3 as that is what this computer is licensed on, but it's near identical: Next you need to set that surface's resolution to be as wide as your total projected image as you need to tell each projector what part of the overall image it's looking at.
The first step is to add both of your projectors to a surface in the surface setup (which it sounds like yo understand how to do). I'm going to skip to the blending part as you seem to have a grasp on how to use most of Qlab. You can absolutely do this in Qlab, and very very easily. It's all different ways of achieving the same goal and being able to do it remotely from a computer is going to absolutely be the right decision (and seriously, spending money to rent a camera is not a good use of funds on a low budget).
It's 2019 and this is much easier done from a computer. But it sounds like an interesting challenge.ĭon't bother doing this in the projector or with geometry correction.
I may not be understanding the full scope of your question. All these complications become more serious the greater the distance to the surface. That yaw (rotation about the centre of the projector) is one of the hardest things to correct for: you lose resolution with keystone and warp, and brightness on the outside edge because the light spreads over a greater area.įocus is also a key issue. I'm a little worried that - as it sounds from your description and answers to other comments - that you will be shooting at a significant deviation from perpendicular to the projection surface. The projector should have both alignment grids and patterns for blend and convergence alignment in different colors.
The internal patterns will give you the actual size of the raster at the projector's native resolution. The easiest thing to do will be to use the internal test pattern of the projectors to make the squarest possible image for each one and then shift them till they overlap the 100 pixels or so you'll need for the blend. It sounds like you have a less than ideal situation. Ideally a blend is done with all the projectors positioned parallel to each other and perpendicular to the surface at a height and distance in relation to the surface such that you are near the "middle" of the lens that is, you have lens travel for shift and are not zoomed all the way out or in. If the projectors and lenses are exactly the same, hung at the same height, distance, and same angle to the projection surface through all three axes you are halfway there. With projection physical geometry is everything. We reserve the right to remove posts and/or comments that contain blatantly dangerous advice. Always consult properly trained personnel when making any decisions on rigging, construction methods, or other areas of production technology that involve risk to life and property.
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