I've painted my mesh in vertex paint, but I would like to edit the colours in Gimp, then reapply them as a texture and bake back to vertex colours.  Is there a way to export just the vertex colours? So it appears as a image file?

There is an addon to "import/export: UV Layout", however I can't see it in my import options after I enable it.

[![enter image description here][1]][1]


  [1]: https://i.sstatic.net/L2gWm.png