python colorsys

rgbshades.py

#!/usr/bin/python

import colorsys

def PrintHex(v):
    vv0 = v[0] * 255.0
    vv1 = v[1] * 255.0
    vv2 = v[2] * 255.0
    print ( "#%02X%02X%02X" % (vv0, vv1, vv2))
    
r = 0.8
g = 0.2
b = 0.3


i = 1.0

hsv = colorsys.rgb_to_hsv(r, g, b)
h = hsv[0]
s = hsv[1]

count = 88.0
i     = 0.0;
while i < (count+1.0):
#    v = i / count
    v = (count-i) / count;  #reverse shades from light to dark
    rgb = colorsys.hsv_to_rgb(h, s, v)
    print ("%0.5ff, %0.5ff, %0.5ff, 1.00000f," % rgb)
#    PrintHex(rgb)  #html color
    i = i + 1.0