; TVTRANSF
;---------------------------------------------------------------
;! Interactively alters the TV image plane transfer function
;# VERB TV INTERACTIVE
;-----------------------------------------------------------------------
;;  Copyright (C) 1995
;;  Associated Universities, Inc. Washington DC, USA.
;;
;;  This program is free software; you can redistribute it and/or
;;  modify it under the terms of the GNU General Public License as
;;  published by the Free Software Foundation; either version 2 of
;;  the License, or (at your option) any later version.
;;
;;  This program is distributed in the hope that it will be useful,
;;  but WITHOUT ANY WARRANTY; without even the implied warranty of
;;  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;;  GNU General Public License for more details.
;;
;;  You should have received a copy of the GNU General Public
;;  License along with this program; if not, write to the Free
;;  Software Foundation, Inc., 675 Massachusetts Ave, Cambridge,
;;  MA 02139, USA.
;;
;;  Correspondence concerning AIPS should be addressed as follows:
;;         Internet email: aipsmail@nrao.edu.
;;         Postal address: AIPS Project Office
;;                         National Radio Astronomy Observatory
;;                         520 Edgemont Road
;;                         Charlottesville, VA 22903-2475 USA
;-----------------------------------------------------------------------
;---------------------------------------------------------------
TVTRANSF  LLLLLLLLLLLLUUUUUUUUUUUU CCCCCCCCCCCCCCCCCCCCCCCCCCCCC
TVTRANSF: Verb which modifies the transfer function of the image
TVCHAN          0.0      4444.0    TV channel(s) selection
                                     Four-decimal coded #
                                     0 => enabled channels
COLORS          0.0         3.0    Color choice (0 all, RGB 1-3)

          Cursor X gives intercept, cursor Y gives slope, and
          buttons A or B turn plot of function on and off.
          Button C reverses sign of slope.  Button D exits.
----------------------------------------------------------------
TVTRANSF
Type:  Verb
Use:   Interactively alters the individual TV channel LUTs.
       The LUT function used is linear with the cursor X
       position controlling the intercept and the cursor Y
       position controlling the slope.  A hit on button C
       reverses the sign of the the slope.  Hit button D to
       exit.  The function is plotted on graphics channel 1.
       Hit buttons A or B to turn the plot on and off.
Adverbs:
TVCHAN    Specifies TV channels in decimal code.  If zero,
          TVTRAN uses all enabled channels.
COLORS    Specifies colors to be used as 0 => all, 1 => red,
          2 => green, and 3 => blue.
----------------------------------------------------------------
