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I've modified the examples you're alluding to in the Sage plotting reference, under "NUMERICAL PLOTTING" (caps in original).

from pylab import * 
imshow([[(0,0,0)]])
savefig('')

This works. Because I don't know much about how matplotlib works, unfortunately when I do another figure it just adds to this one (or if I do another one first, this adds to it). Hopefully someone else - or you - can answer that for me!