LilyPond Beginnershandleiding

Hoofdstuk 4: Tweaking output 103
}
c4 b8 c d16 c d8 |
g,8 a16 b8 c d4 e16 |
e8
12
16
Note that in this case the function x11-color takes a symbol as an argument, so the symbol
must be preceded by an apostrophe to keep it from being evaluated as a variable, and the whole
function call has to be enclosed in parentheses.
There is another function, one which converts RGB values into internal colors – the rgb-color
function. This takes three arguments giving the intensities of the red, green and blue colors. These
take values in the range 0 to 1. So to set the color to red the value should be (rgb-color 1 0
0) and to white it should be (rgb-color 1 1 1):
{
\time 12/16
\override Staff.BarLine.color = #(rgb-color 1 1 1)
c4 b8 c d16 c d8 |
g,8 a16 b8 c d4 e16 |
e8
}
12
16
Finally, there is also a grey scale available as part of the X11 set of colors. These range from
black, 'grey0, to white, 'grey100, in steps of 1. Let’s illustrate this by setting all the layout
objects in our example to various shades of grey:
{
\time 12/16
\override Staff.StaffSymbol.color = #(x11-color 'grey30)
\override Staff.TimeSignature.color = #(x11-color 'grey60)
\override Staff.Clef.color = #(x11-color 'grey60)
\override Voice.NoteHead.color = #(x11-color 'grey85)
\override Voice.Stem.color = #(x11-color 'grey85)
\override Staff.BarLine.color = #(x11-color 'grey10)
c4 b8 c d16 c d8 |
g,8 a16 b8 c d4 e16 |
e8
}
12
16
Note the contexts associated with each of the layout objects. It is important to get these right,
or the commands will not work! Remember, the context is the one in which the appropriate
engraver is placed. The default context for engravers can be found by starting from the layout
object, going from there to the engraver which produces it, and on the engraver page in the IR
it tells you in which context the engraver will normally be found.