Hi all,

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.
Using a script heavily inspired by the one referenced in the "stiching 
scanned image" tutorial, or the script from Matthew Petroff 
(https://github.com/mpetroff/stitch-scanned-images) usually gives good 
results.
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,
Pierre

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