Panotools::Script::Line::Mask - Image Mask

Optional image masks are described by a 'k' line

  i2           Set image number this mask applies to

  t0           Type for mask:
                   0 - negative
                   1 - positive

  p"1262 2159 1402 2065 1468 2003"  List of node coordinates
               Coordinates are in pairs, at least three pairs are required