%N pgqitf %F $MIR/src/pgqitf.f
%D Inquire image transfer function
%B
      SUBROUTINE PGQITF (ITF)
      INTEGER  ITF

 Return the Image Transfer Function as set by default or by a previous
 call to PGSITF. The Image Transfer Function is used by routines
 PGIMAG, PGGRAY, and PGWEDG.

 Argument:
  ITF    (output) : type of transfer function (see PGSITF)
