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@Section
@Title { Colour }
@Tag { colour }
@Begin
@PP
Colour is obtained in much the same way that fonts and language changes
colour. @Index @Code "@Colour"
color. @Index @Code "@Color"
are, using the @Code "@Colour" (or equivalently {@Code "@Color"}) symbol:
@ID @Code "grey @Colour { Hello, world }"
produces
@ID grey @Colour { Hello, world }
The @Code "@Colour" symbol will accept any of the following colours:
@QD @HAdjust @Tab
vmargin { 0.7vx }
hmargin { 0.2c }
@Fmta { @Col A @Colour @FilledBox ! @Col @Code A ! @Col !
@Col B @Colour @FilledBox ! @Col @Code B ! @Col !
@Col C @Colour @FilledBox ! @Col @Code C }
@Fmtb { @Col A @Colour @FilledBox ! @Col @Code A ! @Col !
@Col B @Colour @FilledBox ! @Col @Code B ! @Col !
@Col ! @Col }
{
@Rowa A { darkred } B { red } C { lightred }
@Rowa A { darkgreen } B { green } C { lightgreen }
@Rowa A { darkblue } B { blue } C { lightblue }
@Rowa A { darkcyan } B { cyan } C { lightcyan }
@Rowa A { darkmagenta } B { magenta } C { lightmagenta }
@Rowa A { darkyellow } B { yellow } C { lightyellow }
@Rowa A { darkgrey } B { grey } C { lightgrey }
@Rowa A { darkgray } B { gray } C { lightgray }
@Rowb A { black } B { white }
}
Monochrome output devices will render them as shades of grey. Colouring
something @Code white makes it invisible, which is sometimes useful.
@PP
In addition to the list of colours given above, there is a special
colour called {@Code nochange} which produces the colour you already
happen to be using.
@PP
Whether or not the colours produced by @Code "@Colour" actually
correspond with the names depends on the output device; the same
nominal colour can look quite different on screen and on paper. The
standard Lout @Code "@SetColour" symbol can provide many more colours
setcolour. @Index @Code "@SetColour"
@Cite { $kingston1995lout.expert}, although they must be specified
using numbers rather than names. For example,
@ID @Code "{ 0.5 0.5 1.0 } @SetColour Hello"
prints @Code Hello in a colour containing red at intensity 0.5, green
at intensity 0.5, and blue at intensity 1.0, which turns out, in the
strange world of colour coordinates, to be a light blue.
@End @Section
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