Film
Makes the frame look like it was shot on film.
Halation glows warm around the brightest parts of the picture, and grain lands over the result, heaviest in the midtones. The grain is a function of the frame's composition time and its place on a fixed raster, and the glow's width a fraction of the frame width, so a seek or a smaller preview shows the same frame.
The effect runs over the fill and under any overlay at the same scope, so a caption added next to it stays clean. A clip overlay under a composition Film is part of the clip's frame by then, and takes the look with it.
An HDR source tone maps to SDR first. HdrMode.Auto reports that as a concession naming this effect, and HdrMode.KeepHdr is refused.
Register the renderer with filters() on the builder. Without it plan refuses the effect by name.