Tkinter Mandelbrot Set

from time import time
from tkinter import Tk, Label, PhotoImage
from math import log

w = 1000; h = 800
t1 = time()
root = Tk()
label = Label(root)
label.pack()
img = PhotoImage(width=w,height=h)
label.config(image=img)
root.wait_visibility()
xc = -0.6; yc = 0.005; m = 0.65
imax = 100; zmax = 50

for y in range(h):
  hexdata = ""
  for x in range(w):
    c = complex(xc + (2 * x - w) / (w * m), -yc - (2 * y - h) / (w * m))
    z = complex(0.0, 0.0)
    for i in range(imax):
      z = z * z + c
      if abs(z) >= zmax: break
    if i >= imax - 1:
      hexdata += "#000000 "
    else:
      zlog = (i - log(log(abs(z)),2)) * 0.7;
      v = log(max(1.0, zlog * 1.5 + 1.0)) * 0.3;
      if v <= 1.0:
        rgb = (v ** 4, v ** 2.5, v)
      else:
        v = max(0.0, 2.0 - v)
        rgb = (v, v ** 1.5, v ** 3)
      hexdata += '#' + ''.join(['%02x' % int(n * 255) for n in rgb]) + ' '
  data = '{ ' + hexdata + ' }'
  img.put(data, to=(0,y))
  root.update()

print( "Elapsed time:", '%7.2f' % (time() - t1), "s" )
root.mainloop()