I think this has nothing to do with dpi, but a file flushing issue.
Try something like below with sage (note that the code does not work
with svn version of matplotlib, i'll commit the fix soon).
import matplotlib
matplotlib.use('Agg')
import matplotlib.pyplot as plt
fig=plt.figure()
plt.plot([1,2,3])
f = open("test.png", "wb")
plt.savefig(f, format="png", dpi=50)
f.flush()
I'll report some more details later.
Regards,
-JJ
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