; TVFIDDLE
;---------------------------------------------------------------
;! Verb enhances B/W or color TV image with zooms
;# VERB TV
;-----------------------------------------------------------------------
;;  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
;-----------------------------------------------------------------------
;---------------------------------------------------------------
TVFIDDLE  LLLLLLLLLLLLUUUUUUUUUUUU CCCCCCCCCCCCCCCCCCCCCCCCCCCCC
TVFIDDLE: Verb enhances B/W or color TV image with zooms
TVCHAN          1.0      4444.0    Channel to enhance
TVLEVS          0.0      1024.0    Peak intensity at OFM
          Instructions will appear on terminal.
----------------------------------------------------------------
TVFIDDLE
Type: Verb
Use:  TVFIDDLE allows the user to fiddle with the zoom and
      enhancement of the currently displayed TV image.  It is
      simply the interactive (second) half if the verb TVALL.
      If button A is hit, the routine allows alteration of the
      black and white transfer function (cursor X sets intercept
      and Y sets slope).  If A is hit again, the color contour
      enhancement is performed (cursor X sets starting point
      of contours, Y sets width).  If button B is hit, the
      zoom magnification is incremented and the cursor position
      controls the position about which the image is zoomed.
      Button C is like Button B except the magnification is
      decremented.  Hit button D to exit.
Adverbs:
  TVCHAN......Specifies which channel is to be "fiddled".
              Lowest channel is used if more than one specified
              (via decimal code).
  TVLEVS......Specifies the maximum intensity expected for
              the sum of all visible, overlapped images.
              Usually 256, 512, 768, or 1024.
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