set the background color to
colorb,
and the foreground to color to
colorf.
Pixels with these values will be anti-aliased. by default,
the background color is taken to be black, and foreground color
is assumed to be white.
The colors can be specified in five ways:
- o
-
A name, assuming
that a pointer to an X11-style color names file was compiled in.
- o
-
An X11-style hexadecimal specifier: rgb:r/g/b, where r g and b are
each 1- to 4-digit hexadecimal numbers.
- o
-
An X11-style decimal specifier: rgbi:r/g/b, where r g and b are
floating point numbers between 0 and 1.
- o
-
For backwards compatibility, an old-X11-style hexadecimal
number: #rgb, #rrggbb, #rrrgggbbb, or #rrrrggggbbbb.
- o
-
For backwards compatibility, a triplet of numbers
separated by commas: r,g,b, where r g and b are
floating point numbers between 0 and 1.
(This style was added before MIT came up with the similar rgbi style.)
Note that even when dealing with graymaps, background and foreground
colors need to be specified in the fashion described above.
In this case, background and foreground pixel values are taken to be the
value of the red component for the given color.