; TVSPLIT
;---------------------------------------------------------------
;! Compare two TV image planes, showing halves
;# VERB TV INTERACTIVE
;-----------------------------------------------------------------------
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;;  Associated Universities, Inc. Washington DC, USA.
;;
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;;
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;;  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;;  GNU General Public License for more details.
;;
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;-----------------------------------------------------------------------
;---------------------------------------------------------------
TVSPLIT   LLLLLLLLLLLLUUUUUUUUUUUU CCCCCCCCCCCCCCCCCCCCCCCCCCCCC
TVSPLIT:  Verb which compares 2 TV planes, showing halves
TVCHAN          0.0        43.0    TV channel(s) selection
                                     Two-decimal coded #
                                     < 12  =>  21
          In split mode:
            Cursor position gives split point, button A selects
            enhance image A, button B selects enhance image B,
            button C increments the split mode and button D
            exits.
          In enhancement mode:
            Cursor X gives intercept, cursor Y gives slope, and
            button C reverses sign of slope.  Buttons A and B
            select which channel to enhance next and button D
            returns verb to split mode.
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TVSPLIT
Type:  Verb
Use:   To compare images on 2 planes of the TV by showing one
       on the left or top and the other on the right or bottom.
       While in normal mode: the cursor position controls the
       split point, button D causes the verb to quit, button C
       "increments" the split mode (switch which image is on
       left/top, switch between horizontal and vertical split,
       where possible0, and buttons A and B select an
       interactive image enhancement (just like TVTRANSF).
       Button A selects channel A and button B selects channel
       B to be enhanced.  During the enhancement, the cursor X
       position controls the intercept and the cursor Y position
       controls the slope of the (linear) transfer function.
       Buttons A and B may be used to select enhancement of
       channels A and B, resp.  Button C will switch the sign
       of the slope and Button D will return the verb to the
       split selection mode.  Instructions to remind you of
       these things will appear on your terminal.
Adverbs:
  TVCHAN.....Selects which channel is "channel A" and "channel
             B" as 10 times # of channel B plus # of channel A.
             If TVCHAN < 12, the verb uses 21.
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