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To reduce head stretching near the edges, barrel distortion was added to this photo.
When I shot this photo, I planned to crop out the guitar case in the middle foreground.
This is the final photo. 
Notice the slightly curved lines of the walls and ceiling.
Another example can be found here.
Copyrighted © 2003 - 2022 by Peter Kwok. Images may not be reproduced for commercial purpose without written permission.