Projection Blending

What is it?

Projection blending (edge blending) is the process of overlapping multiple projectors and softening their edges so the combined image appears seamless. In fulldome, this is essential when using 2–9+ projectors to cover the dome.

How It Works

1. Geometric warping — each projector's output is pre-distorted to map correctly onto the curved dome surface
2. Edge blending — overlap zones between projectors are softened (feathered) so brightness is uniform
3. Auto-calibration — camera-based systems photograph the projected image and automatically adjust geometry and colour matching

Challenges

• Colour matching between projectors (even same model units vary)
• Black level mismatch in overlap zones
• Maintaining calibration over time as projectors age
• Higher projector count = more overlap = more wasted light

LED domes eliminate blending entirely — each panel is individually calibrated and there are no overlap zones.

See also: DLP Projection → · Cross-Reflectance → · LED Dome →

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