RawTherapee and GIMP
4 Likes
I’m a little late on this one, but it was interesting to play with.
IMG_1907.CR3.xmp (13.9 KB)
My usual trick for rotation is just to keep drawing freehand horizontal lines until I land on something that looks natural. It didn’t work at all for this one, but a vertical line up through one of the standing people seemed to nail it and I added a small vertical axis perspective change to balance the bridge and the building on the left. The tower ended up clipped as a result, which wasn’t desirable.
3 Likes
I chose not to completely fix the perspective, because they simply don’t look natural. Instead I manually did some perspective correction and rotation then retouched out the building to the side.
IMG_1907.CR3.xmp (16.3 KB)
4 Likes
Eyeballed, cloned/healed and healed resulting transparancies via Resynthesizer. Not a perfect solution by any stretch. 
1 Like
The tool darktable offers for such work is the scale pixels module, (which darktable activates automatically where it senses that an image’s sensor format necessitates this).
The default 1.0 ratio value is neutral, while the module compresses on the horizontal axis with the slider moved to lower ratio values at left, and on the vertical axis moved to the right.
(Thanks to @kofa for once responding to a similar question from myself.)
3 Likes