Projector Edge Blending Pattern

Free interactive edge-blending pattern for multi-projector and projection-mapping setups. Generates a gamma-correct soft-edge gradient (the alpha falls off as a power curve so two overlapping projectors sum to perceptually-uniform brightness) on any of the four edges. Adjustable overlap percentage 5-40%, gamma 1.5-2.8, and four background patterns (white, alignment grid, 50% grey, brightness ramp).

How to use

1
Set overlap

Typical 15-20% overlap zone works for most setups. Larger = more forgiving alignment, smaller = more usable image area.

2
Project on both projectors

Left projector: right-edge blend. Right projector: left-edge blend. Both at the same overlap percentage.

3
Tune gamma

If the blend zone looks brighter than the rest, lower gamma. If darker, raise it. Most projectors land at 2.2–2.4.

4
Verify with grid

Switch to the alignment grid pattern to check that the two grids align pixel-perfectly in the overlap zone.

Soft-edge gradient for clean multi-projector overlap

For two-projector horizontal setup: project this on the LEFT projector with right-edge blend at 15-20%, and the same pattern on the RIGHT projector with left-edge blend at the same percentage. Where they overlap, the gamma-correct gradients sum to a uniform field. Adjust gamma until the blend zone matches the rest of the image.

Features

Gamma-correct gradient 4 edges + 4 patterns Live preview Universal
Who is this tool for?
📽️ Projector Owners

FAQ

Why gamma-correct?

Brightness perception is non-linear — adding two 50% linear-light fields gives 100% physically, but the eye perceives them as ~73%. Gamma-correcting the alpha curve compensates so the visual sum is flat.

Do I need projectors that support edge blending?

No — this tool generates the blend in software. The projector just renders the gradient; you don't need any proprietary blend menu. Hardware blending (when available) is more flexible (e.g. asymmetric blends).

How do I align the projectors first?

Use the alignment grid pattern. Both projectors should render the same grid. In the overlap zone, lines from each must coincide pixel-perfectly. Use lens shift, keystone correction or physical positioning to achieve this BEFORE turning on blending.

💡 Want us to improve this tool just for you?

We can — and it's free! Just send us a quick message with your idea. If you'd like to discuss it in detail, leave your email and we'll get back to you. You can stay anonymous.

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