AIPS HELP file for TVLUT in 31DEC22
As of Sat Dec 2 7:42:07 2023
TVLUT: Verb which modifies the transfer function of the image
NPOINTS 0.0 127.0 Number of vertices between
the end points. 0 => 1.
TVCHAN 0.0 16.0 TV channel(s) selection
Four-decimal coded #
0 => enabled channels
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. First enter all vertices in
order from left to right pressing any button at the
desired location. Then modify any vertices desired
pressing any button to select the vertex and, when
ready, any button to set the position and go on to the
next. In this mode, button D exits.
Use: Interactively alters the individual TV channel LUTs. The LUT
function used is piece-wise linear with as many as 128 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.
The program begins by requesting the specified number of
vertices in sequence from left to right. Press any button to
go on to the next vertex in the sequence. Then the verb allows
you to alter any of the previously specified vertices. In this
mode, the pressing of any button sets the current vertex.
After pushing that button, move the cursor to the next vertex
to be altered 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.
TVCHAN......Specifies TV channel. If zero, TVLUT uses all enabled
COLORS......Specifies colors to be used as 0 => all, 1 => red,
2 => green, and 3 => blue.
NPOINTS.....Number of vertices between the lowest input value and
the highest input value (not counting the points at the