First, some background, I'm currently trying to digitize all my father's paintings and drawings; For artworks somewhat larger than my scanner I needed stitching, and have been using hugin for that purpose for a few months now.
The main issue I'm often facing is that the output image has some kind of trapezoidal distortion, from mild to pronounced: usually the left end is taller than the right end.
I don't know why this happens, images overlap correctly and I can stitch the same images manually without too much effort (it's just a lot slower).
My current hypothesis is that output uses a rectilinear projection, but I'd need a projection that's both rectilinear and conformal. I there a way to request such optimization, or to postprocess control points mapping to convert it to a conformal mapping?
Thank you for your attention,