Create colors with a given transparency value, or mimick transparency by mixing with the background colour.
a valid color specification
numeric, alpha level, between 0 and 1.
alphacol follows the concept of alpha
A number α between 0 and 1 controls how opaque the colour is. When printing a colour A with alpha-level α over a colour B, the result becomes αA + (1-α)B. Thus,
alpha = 1 equals to a colour that overplots other
colours, and for
alpha = 0, the colour is
R allows to define RGB colours with true alpha
transparency, however, not all devices support that.
Therefore, the default behaviour of
alphacol is to
mix the input colour A with the background colour found
par("bg"). A colour with
alpha < 1 thus
actually also prints opaque. If you want to change this
.plottopt$alphamixing = TRUE.
a colour in RGB format. If alpha < 1, the colour is lighter than the input colour, see the details.
Ute Hahn, [email protected]
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