Recently did a fairly standard requirement using AEFX Rotobrush . (see frame grabs below - before and after)
It was reasonably time consuming ( but thank god for Rotobrush anyway) due to amount of movement by FG talent who was over all the areas I needed to "fix" with a degree of motion blur.
After completing it I wondered if I could have made it simpler ( and quicker) by making my layer much easier for Rotobrush to work with....?
eg. Could I have made a duplicate working layer, ......Sharper, higher contrast, higher saturation, lower saturation, single channel...then copied the "effect" back to the original layer.
I know that it works to copy the effect.
Any thoughts from the experienced roto-ers?
I'm a bit unclear when motion blur was added, but I would definitely have done it AFTER the roto work. I think you would get more convincing results.
The motion blur I was dealing with was in the footage ( progressive).
It wasn't such a big issue when seeing the shot in motion (in fact its natural) but it probably did not help the Rotobrush do its job.
Required a bit of plus / minus brush work for virtually every frame. ( 150 frames)