Rotoscoping a spinning object

[Anonymous]

I am rotoscoping a spinning object and while the object is moving its edge is blurred.

Should I include this blurred edge inside the mask. Or should I exclude this burred edge from the mask. Or run the mask through it(half in half out).

[Amit]

i think half in half out, with a little feather on the mask

bye

[bnw]

Be prepared for huge amounts of pain when you come to comp it over something else. The original background will probably show through quite obviously. Best advice, Don’t Do That 🙂

One thing you could try if you have time and it really looks bad is doing masks for both the inside (fully opaque part) and outside edge (with feathering to match). Then you can subtract the inside part to get a matte for the blurred edge, then attempt to colour suppress or at least do something to remove the original backgrond from that area, leaving the opaque parts of the object alone.

If your object is going past hard edged objects that won’t work so good, so you might be better off staying inside the blurred area and then re-motion blurring the isolated object, which will end up chewing some of the edge off but at least keeps it smooth and without the old background.

[Saran Sirikasamsap]

whats the BG of the spinning object ?

[Shiv]

if it’s against a flat color you can try to rotoshape with a blured mask and then try do divide by the shape and then apply to the result the shape as mask

[Author]

Posts