fig=plt.figure(figsize=(float(image.size[0])/my_dpi,float(image.size[1])/my_dpi),dpi=my_dpi)
ax=fig.add_subplot(111)

# Remove whitespace from around the image
fig.subplots_adjust(left=0,right=1,bottom=0,top=1)

# Set the gridding interval: here we use the major tick interval
myInterval=100.
loc = plticker.MultipleLocator(base=myInterval)
ax.xaxis.set_major_locator(loc)
ax.yaxis.set_major_locator(loc)

# Add the grid
ax.grid(which='major', axis='both', linestyle='-')

# Add the image
ax.imshow(image)

# Find number of gridsquares in x and y direction
nx=abs(int(float(ax.get_xlim()[1]-ax.get_xlim()[0])/float(myInterval)))
ny=abs(int(float(ax.get_ylim()[1]-ax.get_ylim()[0])/float(myInterval)))

# Add some labels to the gridsquares
for j in range(ny):
    y=myInterval/2+j*myInterval
    for i in range(nx):
        x=myInterval/2.+float(i)*myInterval
        ax.text(x,y,'{:d}'.format(i+j*nx),color='w',ha='center',va='center')

# Save the figure
fig.savefig('myImageGrid.tiff',dpi=my_dpi)

Traceback (most recent call last):
  File "/usr/lib/python2.7/atexit.py", line 24, in _run_exitfuncs
    func(*targs, **kargs)
  File "/usr/local/lib/python2.7/dist-packages/matplotlib-1.3.1-py2.7-linux-i686.egg/matplotlib/_pylab_helpers.py", line 86, in destroy_all
    manager.destroy()
  File "/usr/local/lib/python2.7/dist-packages/matplotlib-1.3.1-py2.7-linux-i686.egg/matplotlib/backends/backend_gtk3.py", line 427, in destroy
    self.canvas.destroy()
AttributeError: FigureManagerGTK3Agg instance has no attribute 'canvas'

Traceback (most recent call last):
  File "/usr/lib/python2.7/atexit.py", line 24, in _run_exitfuncs
    func(*targs, **kargs)
  File "/usr/local/lib/python2.7/dist-packages/matplotlib-1.3.1-py2.7-linux-i686.egg/matplotlib/_pylab_helpers.py", line 86, in destroy_all
    manager.destroy()
  File "/usr/local/lib/python2.7/dist-packages/matplotlib-1.3.1-py2.7-linux-i686.egg/matplotlib/backends/backend_gtk3.py", line 427, in destroy
    self.canvas.destroy()
AttributeError: FigureManagerGTK3Agg instance has no attribute 'canvas'