Thomas Schmitt wrote:
> # Minimum brightness for blue to be perceivable
> blue_base=64
>
> # Minimum advantage of blue over (red + green)/2
> blue_advantage=64
Thanks a lot, this is what I had in mind exactly!
Is this a correct implementation?
(defalias '** #'expt)
(defun blue-p (r g b)
(let*((min-adv (** 2 6))
(rg (ceiling (/ (+ r g) 2.0)))
(diff (- b rg)) )
(<= min-adv diff) ))
;; (blue-p 0 0 64) ; t
;; (blue-p 1 0 64) ; nil
;; (blue-p 191 191 255) ; t
;; (blue-p 191 192 255) ; nil
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