The RotoPaint is a big brother of the Roto node. It can can make rotos in the same way that the Roto node can, plus it can stroke that roto with different tools: color, dodge, burn, blur, sharpen and smear. This node's functionality is quite large and may qualify it as a kind of 'mini Photoshop' within Nuke.
It is a very complex node, the function of which I shall only lightly cover. Selected functionality includes:
- The ability to arrange rotos inside of a folder. This is very useful for complex rotoscoping.
- The ability to cut away ('reveal') to a background image. This is an effective alternative to removing unwanted elements from footage. The background image is typically something called a 'clean plate'. This is a still image of a scene without any actors and unwanted paraphernalia.
- The ability to mask rotos with other rotos, according to blend modes and suchlike.
I will show you more about the RotoPaint node in class, or Google one of the many great tutorial videos out there.
- Tip: By default, RotoPaint's paint strokes only last one frame. This can confuse the newbie user, who is left with the impression that their paint marks have disappeared the moment they advance one frame. The temporal persistence of each brushstroke is set in the 'Lifetime' tab.
- Tip: Though it is easily possible to use the RotoPaint to clone features into (and out of) an image, it is a very 'heavy' node that requires much processing. You might consider instead making the clone in PS and using that instead. Even moving footage can be dealt with in this way, using a Tracker node to transform the results into place.
Please see the Roto page for more roto-related goodness.