Reproject on Cropping

from blog Jeff Kaufman's Writing, | ↗ original
Sometimes you'll come across a picture that looks all skewed, usually where someone cropped a small piece out of the corner of something larger: Projecting a 3D scene to make a 2D picture unavoidably introduces distortion, worse the farther you are from the center, so if you crop to just the corner of a picture you're getting a lot of distortion....