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Straighten technical drawing
#1
I had a problem with a technical drawing, it was slightly distorted. The straight lines are not perpendicular. Using the gimp transform tools in combination with guides gives a good result but was a little complicated. Then I remembered a had the 'Align to path' (ob-align.py) plugin. https://www.gimp-forum.net/attachment.php?aid=275
Creating two u-formed paths (blue and red on the images), placing guides and using the plugin corrected the drawing. I've drew the U-forms from left to right and chose a reference point left below the u-forms. A simple example shows how it works :

distorted :     
   

corrected :
   

PS: if the drawing is dimensioned, then one can use guides and rulers to get a correct ratio.
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#2
Star 
Really practical and functional.
Thanks for the tutorial and the plugin.  Path Perspective

Plugin will be in Filters - Distorts - Align to Path
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