Thanks Robert for the clarification. Of course I meant de-spotting, just an old habit to call it spotting (from brush on print days). I’ll give it a go. But if the “still” image changes from clip to clip, or for example moving clouds. moving people , I can’t see how fixing one frame (which I know how to do) and “stretching” it would work. In Adobe Lightroom you can extract a jpeg from a film clip, fix exposure and a few other things, then “sync” that jpeg with the original movie clip and it adjusts EVERY frame in the clip. Unfortunately the “healing and clone tool”, noise reduction and many other adjustments are NOT available to use that way. Just simple exposure and contrast and those you can probably do better in FCPX. If you find something interesting you can contact me at edoATedophoto.com if you like.
Ed