rtPalette: Create non-linear palettes
In EhrmannS/rasterTools: Obtain and process earth observation data

A wrapper around colorRampPalette to create palettes where the number of interpolated colours is not linear, i.e. there may be a different number of colour values between the colors that shall be interpolated.

1	rtPalette(colors, steps = NULL, ...)

`colors`	[`character(.)`] colours to interpolate. must be a valid argument to `col2rgb`.
`steps`	[`integerish(.)`] the number of colours between each of `'colors'`.
`...`	arguments to pass to `colorRampPalette`.

myColours <- terrain.colors(5)

linearPalette <- rtPalette(colors = myColours)
pie(x = rep(1, 50), col = linearPalette(50), labels = NA)

nonlinearPalette <- rtPalette(colors = myColours, steps = c(20, 20, 2, 2))
pie(x = rep(1, 50), col = nonlinearPalette(50), labels = NA)