Shades an RBG color
a vector of RGB color(s)
numeric value between 0 and 1. Zero means no change and 1 results in black
This function shades an RGB color and returns the shaded RGB color (with alpha channel added)
Claus Ekstrom email@example.com
Ekstrom, CT (2011) The R Primer.
newcol <- col.shade("blue")
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