Compute the Convex Combination of Two Colors
This function can be used to compute the result of color mixing (it assumes additive mixing).
mixcolor(alpha, color1, color2, where = class(color1))
alpha | 
 The mixed color is obtained by combining an amount
  | 
color1 | 
 The first color.  | 
color2 | 
 The second color.  | 
where | 
 The color space where the mixing is to take place.  | 
The mixed color.  This is in the color space specified by
where.
Ross Ihaka
mixcolor(0.5, RGB(1, 0, 0), RGB(0, 1, 0))
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