"Regarding your change in luminance idea. You could generate a selection mask based on frame difference (using temporal ip op for example), and then use that to constrain path start points in the paint synthesizer."
"Perfect way to describe it.
When testing settings with TempImOps, If one is subtle and meticulous in varying settings, one can sometimes crack the visual code. And the source video makes a big difference. In this case the motion (slender fish…"