; TVMLUT
;---------------------------------------------------------------
;! Verb which modifies the transfer function of the image
;# VERB TV
;-----------------------------------------------------------------------
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TVMLUT    LLLLLLLLLLLLUUUUUUUUUUUU CCCCCCCCCCCCCCCCCCCCCCCCCCCCC
TVMLUT: Verb which modifies the transfer function of the image
TVCHAN          0.0        16.0    TV channel 0 => enabled
COLORS          0.0         3.0    Color choice (0 all, RGB 1-3)

          Cursor position gives position of a vertex of a piece-
          wise linear function.  Button A or B creates a new
          segment.  Button C lets you select an old vertex to
          reset and button D exits.
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TVMLUT
Type:  Verb
Use:   Interactively alters the individual TV channel LUTs.  The LUT
       function used is piece-wise linear with as many as 127 pieces
       allowed.  The cursor is used in conjunction with TV graphics
       channel 3 to develop the LUT function.  The cursor position
       controls the position of the vertex currently being modified.
       Pressing buttons A or B adds another linear segment to the
       function at the right hand (higher input values) end.  Pressing
       button C allows you to reset a previously set vertex.  After
       pushing C, move the cursor to the desired vertex and push any
       button.  Push button D to exit.  Note that graphics on the TV
       is slow.  Move the cursor slowly and wait for a plot to finish
       before hitting a button.
Adverbs:
  TVCHAN.....Specifies TV channel.  If zero, TVMLUT uses all enabled
             channels.
  COLORS.....Specifies colors to be used as 0 => all, 1 => red,
             2 => green, and 3 => blue.
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