Peter Quint provides an introduction to basic compositing in Houdini. This first part looks at color and alpha planes, the use of matte shading. It also covers generator and filter compositing nodes, and the beginnings of masking. The second part looks at masking in more detail, including keying. It looks at more advanced color correction, and finally at basic compositing operations such as over and atop.
Basics : Compositing I from Peter Quint on Vimeo.
Basics : Compositing II from Peter Quint on Vimeo.