Matplotlib multiple set_over / under

[G_rizzle]

Hey,

I'm plotting gradients of a surface. Most of them lay between 0 -1, but there are also a few from 1 - 700.

Right now im coloring gradients > 1 in matplotlib via the set_over function

label_schriftgroesse = 20
schriftart = "Courier"

fig, ax = plt.subplots(figsize=(30,15))

custom_cmap = copy.copy(cm.get_cmap("gray"))
custom_cmap.set_over(color=[1,1,0])

plt.imshow(G_np, cmap = custom_cmap, 
           origin="lower",
           vmax = 1,
           extent=[x_koordinaten_np[0],x_koordinaten_np[-1],       # X-Werte
                   y_koordinaten_np[0],y_koordinaten_np[-1]],      # y-Werte
            interpolation='none')

ax.set_xlabel('x [mm]', fontsize=label_schriftgroesse, fontname = schriftart)
ax.set_ylabel('y [mm]', fontsize=label_schriftgroesse, fontname = schriftart)

clb = plt.colorbar(extend = 'max')


clb.set_label("z [mm]", fontsize=label_schriftgroesse, fontname = schriftart)
plt.show()

giving me the attached picture below.


actually it would be great not just to plot everything >1 in one colour, but plotting for example values between 1-100 green, 100-200 blue etc etc.

How can i achieve that?