Encode an int to a normalized rgb value and back again.

encodeDecode.py

base = 256
def encode(val):
    r = val / (base * base) 
    g = (val / base) % base
    b = val % base 
    return [float(r)/255.0, float(g)/255.0, float(b)/255.0]

def dot(K, L):
    if len(K) != len(L):
        return 0
                
    return sum(i[0] * i[1] for i in zip(K, L))

def decode(rgb):
    rgb = [rgb[0]*255.0, rgb[1]*255.0, rgb[2]*255]
    return dot(rgb, [base*base, base, 1.0])
    
val = encode(12345679)
print(val)
print(decode(val))