In version 5 this is possible: In the editor select the "Perspective
Correction" tool in the "Transform" menu. There you need to select
"Inverse transformation". Then you can draw the corners of the rectangle
to the the rectangular image element.
___
Package: digikam
Version: 2:1.0.0~rc-1
Severity: wishlist
When image is an square 2D work (like photo on wall, window, door, or paint)
and was shooted from side, to correct perspective while using perspective
correction tool, it's really hard to restore image back to rectangle. Much
easely is
