[Gimp-user] transform questions

[rich404 <forums gimpusers com>]

> thanks very much for the reply... that looks like what I want to do,
> albeit my upper layer is the map (with white made transparent) over an
> airphoto base layer, but it should work to scale, rotate, and
> reposition pertinent map details onto the airphoto as I can pick
> similar geographic locations on each layer.

Remember this plugin aligns between two points only and scaling / rotating is
linear. If you need a degree of distortion to get those several 'pertinent'  map
details matched you will have a lot of manual editing.

> ...snip...
> At this point however my program knowledge fails me and
> the path help section still leaves me puzzled.  Can you advise how I
> set up this path abcd and particularly how do I use plug-ins or these
> scripts?  

You do not say which operating system you use, so guessing a Windows user. If
you download ofn-layer-aligner.zip, unpack and put the python plugin
ofn-layer-aligner.py in the Gimp profile plugins folder. There are help files in
the zip.

C:\Users\"yourname"\AppData\Roaming\GIMP\2.10\plug-ins

Easy enough to apply, but tedious to describe on this mailing-list type forum.
This a short video on one way you might match two layers.

https://youtu.be/Hc2LhezEhjY  only 3 minutes 40 secs so not too arduous.

best of luck

-- 
rich404 (via www.gimpusers.com/forums)