AIPS HELP file for OFMADJUS in 31DEC18
As of Tue Sep 25 13:48:45 2018
OFMADJUS: Verb to modify the TV OFM lookup tables interactively
No adverbs, input comes via the TV cursor or the
terminal after appropriate prompts.
Use: Verb to modify the TV's OFM lookup tables using the
cursor and, optionally, the terminal interactively.
Here the OFM is considered to be a set of piecewise
linear functions. The user specifies a range of
input intensities for the current piece and then a
range of blue, green, and red output intensities for
that piece. Note that all 3 colors do not have to
be specified for a given piece, and only those
colors specified will be changed.
The verb begins by drawing a graph for input
intensities and a graph for each output color at the
top of the TV screen in a graphics overlay plane. At
the bottom of the screen, it then draws a menu of
options. You select an option by moving the TV cursor
to the name of the option and the hitting button A, B,
or C. The menu looks like:
SET IN RANGE UNDO ONE CHANGE TYPE IN RANGE
SET R OUT SHOW HISTORY TYPE IN R OUT
SET G OUT UNDO ALL CHANGES TYPE IN G OUT
SET B OUT EXIT TYPE IN B OUT
The left hand column refers to interactive cursor
input of the values, while the right hand column is
used to type in the numbers from the terminal. The
IN RANGE for a segment must be set first, then one or
more colors may be set (or reset). In the TV mode,
levels are set by the X position of the cursor and
the values are displayed in the left or right ends of
the appropriate graph. While setting a number, button
A switches to setting the other number, button B
reinstates the numbers for this color that were in
place when the current interaction began, and button C
freezes the numbers allowing a new menu option to be
selected. Whenever possible, the OFM is modified as
you change the numbers. Note that the first input
intensity is displayed at the left of the graph and
the output color values displayed at the left are
those assigned to that input intensity. The numbers
in the right hand column are connected similarly.
To freeze the current segment and go on to another,
simply enter a new IN RANGE via the cursor or the
The numbers for the present segment and all previous
segments are saved in a "history" list. To display
all segments so far, select SHOW HISTORY. Note that a
color which is not altered by an entry in this list is
indicated by output levels of -999 in the history
display. To remove all history and go back to the
initial OFM, select UNDO ALL CHANGES. To remove any
one entry in the history list, select menu option
UNDO ONE CHANGE and type in the number of that entry
on the terminal. The OFM will be recomputed with that
entry turned to null (all -999).
Button D exits the verb, freezing the OFM at that
point, even if the last segment has not been saved
or even properly set. What you see is what you get,
and the history is forgotten.
Adverbs: None, input will be prompted for.
See also: OFMLIST, OFMTWEAK, OFMCONT, TVPSEUDO.
OFMSAVE is used to preserve the tables you create.