code: def cmyk_to_rgb(Class, c, m, y, k):
          
          c = float(c)/100.0
          m = float(m)/100.0
          y = float(y)/100.0
          k = float(k)/100.0
  
          nc = (c * (1-k)) + k
          nm = (m * (1-k)) + k
          ny = (y * (1-k)) + k
  
          r = int((1-nc) * 255)
          g = int((1-nm) * 255)
          b = int((1-ny) * 255)
  
          return dict(r=r, g=g, b=b)
docs: CMYK in % to RGB in 0-255
          based on https://www.openprocessing.org/sketch/46231#