AddBorders
==========

.. function::   AddBorders(vnode clip[, int left=0, int right=0, int top=0, int bottom=0, float[] color=<black>])
   :module: std

   Adds borders to frames. The arguments specify the number of pixels to add on
   each side. They must obey the subsampling restrictions.
   The newly added borders will be set to *color*.
