; TVTRANSF
;---------------------------------------------------------------
;! Interactively alters the TV image plane transfer function
;# VERB TV INTERACTIVE
;-----------------------------------------------------------------------
;;  Copyright (C) 1995, 2008
;;  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.
;;
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;;         Postal address: AIPS Project Office
;;                         National Radio Astronomy Observatory
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;-----------------------------------------------------------------------
;---------------------------------------------------------------
TVTRANSF  LLLLLLLLLLLLUUUUUUUUUUUU CCCCCCCCCCCCCCCCCCCCCCCCCCCCC
TVTRANSF: Verb which modifies the transfer function of the image
TVCHAN          0.0        16.0    TV channel; 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.
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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 the TV channel.  If zero, TVTRAN uses all
             enabled channels.
  COLORS.....Specifies colors to be used as 0 => all, 1 => red,
             2 => green, and 3 => blue.
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