How to make a lerpColor() function without ProcessingJS

Question

I would like to create my own lerpColor(c1, c2, amount) function, with the same output as the one in ProcessingJS http://processingjs.org/reference/lerpColor_/

I am looking or something like this:

lerpColor = function (c1, c2, amount) {
    // Do some math stuff here
    return(newColor);
};

Any help would be greatly appreciated.

Answer 1

If this color interpolation works purely in RGB color space, you need to extract color components and apply the next arithmetics to each component

r1 = red(c1)
r2 = red(c2)
result_red = (1-amount) * r1  + amount * r2
or 
result_red = r1 + amount * (r2 - r1)
...
return(color(result_red, result_green, result_blue));