After
the animations are drawn and scanned they will
get one at a time imported in a graphical program
like Flash or Illustrator, where the drawings
will all get digitally coloured. This is a lot of
work, because it has to be done one frame at a
time - a sweater has to have the same colour in
every frame for example.
After
the colouring is completed, this is made in Flash
and sometimes in a program as Illustrator, if
more possibilities required.