- user interface for setting JPEG quality
- select page to open in multi-page TIFF
- open multi-page TIFF as Multichannel?
- save Multichannel as multi-page TIFF?
- JBIG compression type (http://www.cl.cam.ac.uk/~mgk25/jbigkit/)
  will apparently arrive in a future release of libtiff,
  according to http://bugzilla.remotesensing.org/show_bug.cgi?id=896