I have a circle in a photo that I need isolate, much like in the thread below. I am fine doing so with either Elliptical Marquee tool or Ellipse tool, as long as I can adjust the size and placement of the "selection" and then convert to a mask of a given layer.
I tried making an Ellipse, but this makes a layer over my target layer.
I tried making a mask layer, clicking it and then adding selection with Ellipse marquee, but when I adjust the size of the ellipse the pixel layer above changes too (stretches).
I've come close by trial and error, but it always ends up fudged in some way.
GOAL: Make first a rough select, then refine it, when convert to mask so that everything around the circle disappears. EDIT: in addition, I'd like the edges of the circle to be smooth, no pixelated.
The video below shows what I want, but I don't quite follow the finger taps and there is no text description of the final solution.
Thanks!