code: def cmyk_to_rgb(c, m, y, k):
      
  
      r = 1.0 - min(1.0, c + k)
      g = 1.0 - min(1.0, m + k)
      b = 1.0 - min(1.0, y + k)
  
      return r, g, b
docs: Cyan, magenta, yellow, black to red, green, blue.
      ReportLab, http://www.koders.com/python/fid5C006F554616848C01AC7CB96C21426B69D2E5A9.aspx
      Results will differ from the way NSColor converts color spaces.