=setcolor, e.g. when setting a non-transparent
blue color as =setcolor(0,0,1,1). As mentioned above,
you may also choose to specify the colors in hex and you can choose
between the two formats 0xRGB (assumes alpha equals 0xFF) and 0xRGBA,
e.g. =setcolor(0x057510). Finally, you may choose to
use one of predefined colors: black, white, red, green, blue,
yellow, cyan, magenta, dgray, lgray, lred, lgreen, lblue, brown,
lcyan, lmagenta, simply by using the string as in
=setcolor("lgreen").
For the non-transparent colors red, green, blue, white and black, short
commands =red, =green, =blue,
=yellow, =white, =black exists.
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