  An important step of many image editing tasks is to extract specific objects
from an image in order to place them in a scene of a movie or compose them onto
another background. Alpha matting describes the problem of separating the
objects in the foreground from the background of an image given only a rough
sketch. We introduce the PyMatting package for Python which implements various
approaches to solve the alpha matting problem. Our toolbox is also able to
extract the foreground of an image given the alpha matte. The implementation
aims to be computationally efficient and easy to use. The source code of
PyMatting is available under an open-source license at
https://github.com/pymatting/pymatting.
