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The colorbar's set_edgecolor function draws a really thick line in the saved PNG figures when the figures are saved with a high dpi option. This reproduces the error:
import numpy as np
import matplotlib.pyplot as plt
r = np.random.random((20,20))
ff = plt.contourf(r, interpolation="nearest" ,extend="both")
cb = plt.colorbar(ff, format="%3.1f")
cb.solids.set_edgecolor("face")
plt.savefig("test23.png", dpi=400, bbox_inches="tight")
Here's a link to the stackoverflow discussion of this issue with figures showing the bug: http://stackoverflow.com/questions/26900160/overflow-of-colour-bar-in-saved-matplotlib-figure?noredirect=1#comment42377205_26900160
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