-C: Set the color mode
The option -Cn sets the color mode to n, where the
color modes are, briefly,
- 0
- No color
- 1
- ANSI color
- 2
- Bilevel
- 3
- Trilevel
- 4
- User-defined
These modes, and color output in general, are described more thoroughly in Color.
For obscure technical reasons, this command is processed differently
than all other command-line options. In the present incomplete
implementation, the color mode must be set on the command line,
not in .fweb! To work around this annoyance, UNIX users
could alias commands such as ftangle -C1.