What kind of program has been used to produce this mock-up image?
Related to Combining rotation and straightening of images. Rotate: Grab a corner, drag it to its new location, rest of image follows. Straighten: Either click-drag-drop a line on a horizon, or click ...
Topic may seem weird as the two terms seem to mean the same. Clarification: Rotation: The typical way of grabbing a corner and pulling in the direction you want the image to rotate. Straightening: ...