DCMTK

Right now we have applications to create LUTs and Curves of any kind,
but not Overlays. One could develop a tool that reads one PBM bitmap
and adds it to an existing DICOM image.

Options:
   --embed-data         embed overlay into Pixel Data element
   --standalone-data    create separate Overlay Data element (default)

   --group 0..15        select repeating group; old repeating group is removed (should we have an auto mode?)

   --origin x y         define origin for overlay (default: 1\1 or 0\0?)
   --type               select OverlayType (G,R,...)

   --bits-allocated     (standalone only:) define bits allocated for OverlayData. Default 1
   --bit-position       bit position in OverlayData or PixelData element. Default: automatic
   --OW                 (standalone only) write as OW (default)
   --OB                 (standalone only) write as OB
   --standalone         ignore input file, write Standalone Overlay SOP Class.