Show dictionary · Video & LED
Edge Blending
Also: blend · soft edge
Edge blending combines multiple projectors into one seamless wide image by overlapping their edges and cross-fading the overlap: each projector ramps its output down across the shared zone so the summed brightness stays even.
In practice
A blend is geometry first, photometry second: the projectors must be warped into precise registration across the overlap (typically 10 to 20 percent of image width), then the blend ramps are shaped so the seam vanishes. Media servers or the projectors themselves do the math; content is rendered as one wide canvas.
The stubborn artifact is black level: a projector’s "black" still emits light, so overlap zones glow brighter in dark scenes than single-projector zones. Black-level compensation lifts the non-overlap areas to match, a dark-room tuning ritual performed after everyone else leaves.
How you’ll hear it
"Kill the room light so we can set the blend black levels; the seam shows in the video dark scenes."
Related resources
Part of the eventools.io Show Dictionary, a free glossary of live event production terminology.