Perspective Correction
Digitally transforming an image to straighten converging verticals or horizontals.
Measured in
degrees
In depth
The transformation stretches part of the frame and compresses another, so it always costs resolution and requires a crop — which means composing with extra room around the subject when correction is anticipated. Fully correcting a steeply tilted building can look unnatural, so many architectural photographers deliberately leave a small residual convergence.
Examples in practice
Correcting a building shot from ground level restores parallel verticals at the cost of about fifteen per cent of the frame.