col.shade {MESS}

Shade an RGB color

Description

Shades an RBG color

Usage

col.shade(col, shade = 0.5)

Arguments

col

a vector of RGB color(s)

shade

numeric value between 0 and 1. Zero means no change and 1 results in black

Details

This function shades an RGB color and returns the shaded RGB color (with alpha channel added)

Author(s)

Claus Ekstrom [e-mail]

References

Ekstrom, CT (2011) The R Primer.

Examples

newcol <- col.shade("blue")