test color mixing in sRGB

sRGB_color_mixing.py

def sRGB_to_linear(c):
    a = 0.055
    if c <= 0.04045:
        return c / 12.92
    else:
        return ((c + a) / (1+a)) ** 2.4

def linear_to_sRGB(c):
    a = 0.055
    if c <= 0.0031308:
        return 12.92 * c
    else:
        return (1 + a)*(c ** (1/2.4)) - a

def mix_srgb(x, y):
    s = (sRGB_to_linear(x) + sRGB_to_linear(y))/2.0
    return linear_to_sRGB(s)
    
print mix_srgb(0, 248 / 255.0) * 255.0