AIPS HELP file for TVOFF in 31DEC20
As of Mon Aug 10 2:35:03 2020
TVOFF: Verb which turns off TV channel(s).
COLORS 0.0 3.0 TV colors to enable
TVCHAN 1.0 16.0 TV channels to turn off
The desired channels may be given instead as an
immediate argument to TVOFF. In that case, the
channel specification is a BINARY mask of the desired
channels. Example: TVOFF(13) will turn off TV
channels 1, 3, and 4 (values 1 + 4 + 8 = 13).
Use: Turn off (disable) one or all colors on one or more gray-scale
image channels on TV. Does not affect status (on or off) of
colors or channels not specified.
Note that, if TVOFF is used in a FOR or WHILE loop or in an
IF-THEN-ELSE construct, then the immediate argument is required.
Otherwise, some item necessary to the loop/construct will be
taken as the immediate argument.
Adverbs: TVOFF takes an immediate arguement specifying, in BINARY
code, which channels to turn off. E.g. TVOFF(43) disables
channels 1, 2, 4, and 6 (values 1 + 2 + 8 + 32 = 43).
COLORS.....Specifies which colors to disable. 0 = all, 1 = red,
2 = green, and 3 = blue.
TVCHAN.....TV channel to turn off. Only used if immediate argument
is omitted and specifies a single value. 0 -> 1