Sometimes, after correcting either vertical or horizontal keystoning, 
so that the lines I want parallel are parallel,  I also want to change the
vertical or horizontal scaling.   That is necessary because the keystoning
correction alone may not yield the right scale.   If one knows the position of
the lens and the actual dimensions of the building, or if one knows the
position of the lens and the angle at which the lens axis points, one can
calculate the proper scaling, but, while the lens position may be in the
exif info, the other information is not.  So one has to correct the scale
by eyeballing it.

I can't find a darktable plugin to do it.

Leonard Evens [email protected]
Professor Emeritus, Department of Mathematics, Northwestern University


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