[Gimp-user] How to find midway

[Synecdoche <forums gimpusers com>]

I'm looking for creating a selection that is halfway between two lines. This is
easiest to explain by reference to an example. In the attached image, I want to
create a selection that is halfway inbetween the outer and image layer of the
green image (i.e. halfway between the green/blue border and the red/green
border). Spent way too long trying to figure it out. Help!


Attachments:
* https://www.gimpusers.com/system/attachments/1196/original/Discrete_Gradiants.png

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