Stefan,

> Is this normal? If so, how do I get around the problem?  I also
> noticed that, even without extents, the image gets scaled after
> plotting.

Try to set the "_autoscale" parameter of your current 'axes' to False. That 
way, you should avoid any inopportune rescaling. For the image, try to use 
aspect='auto'.

For example,

P.imshow(x,extent=(0,x.shape[1],x.shape[0],0))
P.gca().set_autoscale_on(False)
P.gca().set_aspect('auto')

Let us know if it works
P.

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