This function can be used to compute the result of color mixing, assuming additive mixing (e.g., as appropriate for RGB or XYZ).
mixcolor(alpha, color1, color2, where = class(color1))
The mixed color is obtained by combining an amount
1 - alpha of
color1 with an amount
The first color.
The second color.
The color space where the mixing is to take place.
The mixed color. This is in the color space specified by