Like in this question, I want transform/rotate an image to match another one (by scale/rotation). Specifically, I want to edit a remake of an old image by cropping/transforming/rotating to match the original)
The tool is not important for me but I'm working on a Linux machine, so Gimp seems to be the first choice. I tried the two-layer approach from the answer in the linked question but this doesn't work because while aligning the transparent layer it becomes opaque.
Is there a way (with whatever tool) to select corresponding points in both images and use points to transform one of the images to match?
How would you do this?