
  extract <from> <to> sx sy nx ny sx sy nx ny

  extract takes a portion of an image (buffer <from>) and creates a
new image (buffer <to>).  The source region is defined by the first
set of (sx sy nx ny), the resulting image and the location of the
extracted image are defined by the second (sx sy nx ny).  This allows
a portion of an image to be overlayed at a particular location in a
larger image.

  See also: Kii, tv

