Python script to find the nearest matching colour name given input R,G, B values (from 0-255).

nearest-colour-name.py

def rgb_from_str(s):
    # s starts with a #.
    r, g, b = int(s[1:3],16), int(s[3:5], 16),int(s[5:7], 16)
    return r, g, b

def find_nearest_colour(R,G, B, colorD):
    mindiff = None

    for d in colorD:
       r, g, b = rgb_from_str(colorD[d])
       diff = abs(R -r)*256 + abs(G-g)* 256 + abs(B- b)* 256 
       if mindiff is None or diff < mindiff:
          mindiff = diff
          mincolorname = d
    return mincolorname
 

if __name__ == "__main__":
  D={}
  for line in lines.split("\n"):
    tokens = line.split()
    if len(tokens) > 1:
        D[tokens[0]]= tokens[1]
     
  R, G, B = 0, 127, 127
  colorname = find_nearest_colour(0, 127, 127, D)
  print hex(R), hex(G), hex(B)
  print colorname, D[colorname]