What is warping (geometry correction) and when do I need it?

Warping, also called geometry correction or keystone correction, digitally adjusts the projected image to appear geometrically accurate even when the projector isn't perfectly aligned with the screen. Ideally you want a projector aimed squarely at the screen in perfect perpendicular alignment, but venue constraints (rigging points, sightlines, room shape) often make that impossible.

Warping compensates for off-axis projector positions, uneven surfaces, and screen curvature. It's also essential when stacking two converged projectors, since even small physical misalignments between the units need to be corrected digitally to avoid a soft or doubled image.

Read more about projectors in our Comprehensive Guide to Projectors article.