def make_color_scale(steps, R=None, G=None, B=None, _min=0, _max=200):
    scale = []
    for n in range(_min, _max, int(_max/steps)):
        cc = (hex(n)[2:]).upper()
        if len(cc) == 1: cc = "0%s"%cc
        r = R or cc
        g = G or cc
        b = B or cc
        scale.append("#%s%s%s"%(r, g, b))
    return scale