Terry Pinfold <[email protected]>
writes:
> I tested the image on the latest Windows version of DT and the auto
> correction options worked well for me.

Thanks for trying it out.  Here is my result with Darktable 3.0.2 on
Windows 10:

https://archive.org/details/p-1100853-corrected

I don’t like it.  The dominant vertical lines on the left and the right
side of the image are not straight.  One problem is that they’re bent
due to optical distortion and maybe also due to construction.  Still, I
think having the top and bottom points aligned would look much better.
So if I could draw two green lines manually, then this would be a quick
solution.

> You can put guides on and use manual slider controls to set yourself
> if you prefer.

I know, but it’s no fun.  Darktable is sluggish on my machine (i7-8650U,
16GiB, Intel graphics).

> Applying specific lens distortion correction first may help improve
> final result, but I was pleased with the job auto did.

Yes, with that camera lens distortion correction is needed.  The lens,
as far as I know, is identical to that in its predecessor, the DMC-FZ5.

This image of course is not great anyhow, having flare and bad contrast.
Nevertheless it’s good for illustrating my issue with perspective
correction in Darktable.

> BTW, GIMP has very good manual perspective tool options if DT result
> is not to your liking.

That takes too much time, plus it’s destructive.  I want to process
images quickly.

Yesterday, I found out about DxO ViewPoint, a tool for perspective
correction.  There one has the option to draw two vertical lines
manually, and done.

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