I’m wanting to make a pattern that resembles a blurry bullseye target which is really a repeated circular gradient with a sine or spherical ramp between the gradient stops. It would be for 3D engraving.
I’m hoping to find a way to do this in Inkscape or gimp where I can vary the frequency and/or width of the waves. I’m new at both of these and so far editing the gradients in inkscape only seems to have a linear ramp. Advice please?