# 0       - 0.2  # extreme 1   (A1 - A4)
# 0.20001 - 0.4  # extreme 2   (B1 - B4)
# 0.4     - 0.6  # border      (E1 - E4)
# 0.6     - 0.8  # transition  (D1 - D4)
# 0.80001 - 1.0  # extreme 3   (C1 - C4)

src_dst 0 0
   fill_noise 3 3 0.4
   hist_equalize 512 0 1

   map_range 0 1 0.40001 1

src_dst 0 1
   fill_noise 3 3 0.4 1
   hist_equalize 512 0 1

   map_range 0.2 0.8 0 0
   map_range 0.8 1 0.20001 0.4
   dst_range 0 0
   src_blend 1
   fill

   #show_region_sectors