       SippPBMOpen [-plain|-raw] filename access
              Open the PBMPlus file filename.  PBM files are cre-
              ated if rendered in LINE mode, PPM files  are  cre-
              ated  for all other rendering modes.  Access is any
              of the standard access modes  allowed  by  the  Tcl
              open  command.   Read  access is not currently sup-
              ported.  The command returns a handle  to  the  PBM
              file.   Filename  follows the full semantics of the
              file name argument to the Tcl open  command.   Thus
              the PBM file may be sent to a pipeline, which could
              be a viewer or post-processing program.
              If -plain is specified, a plain (ASCII) format file
              is  created.   If -raw is specified, a raw (binary)
              format file is created.  If neither are  specified,
              raw  format is used.  These flags may not be speci-
              fied when reading a file.
