I tested the image on the latest Windows version of DT and the auto correction 
options worked well for me. You can put guides on and use manual slider 
controls to set yourself if you prefer. Applying specific lens distortion 
correction first may help improve final result, but I was pleased with the job 
auto did. BTW, GIMP has very good manual perspective tool options if DT result 
is not to your liking.

Dr Terry Pinfold
Cytometry & Histology Lab Manager
Lecturer in Flow Cytometry
University of Tasmania
17 Liverpool St, Hobart, 7000
Ph 6226 4846 or 0408 699053
________________________________
From: Felix E. Klee <[email protected]>
Sent: Saturday, 25 July 2020 2:39 PM
To: [email protected] <[email protected]>
Subject: [darktable-user] Manual lines for perspective correction?

In the following image, the perspective correction tool does not do a
good job at finding straight lines. It gets confused by the brick wall.

https://archive.org/details/p-1100853<https://archive.org/details/p-1100853>

Is there a way to manually draw green lines?

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