These functions obtain the value of a colour property, or modify it. They will convert between colour spaces as required, but the RGB representation will be appropriately updated in the result.
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One or more colours, in any suitable form (see
New values for the property in question. If
Arguments to replacement functions
Brightness and lightness differ technically, in the sense that one is absolute and the other is relative. Intuitively, a grey square on white paper is brighter under bright sunlight than in a dark room, but its lightness (relative to the white around it) is constant between conditions. In these functions, brightness is “value” in HSV space and is between 0 and 1, while lightness is defined in Lab space and is between 0 and 100. Saturation and chroma are also related. Hue is defined in HSV space, with red at 0º (and 360º), which is generally the most familiar parameterisation.
Current colour property values, or new colours of class
The colour property functions are vectorised over both of their
arguments, such that the dimensions of the result will be
c(length(values),dim(shades)). However, the
can be used to suppress the usual dimensional expansion, and instead
follow R's standard recycling rule.
Jon Clayden <[email protected]>
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