Transparent or lighter versions of colors

For each color, create a lighter version either by introducing transparency or by just dimming down.

thlShade(col, alpha = 0.25, thin = 1)

Arguments

col

A color. Eighter a name such as "red" or preferrably a hex string such as "#FF0000"

alpha

Amount of transparency, 1=not transparent, 0=fully transparent. Recycled.

thin

Amount of lightening, 1=none, 0=white.

Value

A vector of rgba values suitable for using in graphics.

Details

Same thin is used for all components of RGB. Thus thin=0 always results in white. No value checking is done, so either thin or alpha outside [0,1] most likely results in error.

Note

Not all graphics devices support transparency. Parameter thin may be helpful in these situations.

See also

col2rgb, rgb

Author

Mikko J Virtanen, Petteri Mäntymaa, Tarja Palosaari, Salla Toikkanen

Examples

thlShade("red", alpha = .40)
#> [1] "#FF000066"
thlShade(palette_thl("quali", n = 8), alpha = .8, thin = .5)
#> [1] "#A8CD97CC" "#97B1D6CC" "#DF9FB9CC" "#FDD38DCC" "#BDE0A1CC" "#94D0E0CC"
#> [7] "#E6BBD6CC" "#E1E1E3CC"