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Implements the *over* alpha blending operation.
alphablend(front_color, back_color, silent = TRUE)
rgba color strings, the alpha-blended colors
rgba color strings, the upper color layer or foreground
rgba color strings, the lower color layer or background
logical, whether to suppress messages
see the *Alpha blending* section on https://en.wikipedia.org/wiki/Alpha_compositing
Other color functions: desaturate()
desaturate()