How to evenly distribute vertices in an uv map? I try to make a UV map for my object that fits the form of an already existing UV map. I manually positioning the outer edge of the map so it matches the existing map. But the innards are not in good shape.
Now I want to select one of the loops and make the vertices have all the same space between them. I tried to use Looptools but they are not available in UV Image Editor.

How can it be done automatically to even out the spacing of all the inner vertices on a selected loop?
Select the loop and enable the Sculpt tool:



With holding Shift smooth the selected vertices. This will space them evenly:

Make sure the sculpt brush has Lock Borders enabled: