Hi there,
A few months back, I complained about the slowness of the image
function in matplotlib. One of the cullprit was a slow clip function;
I've done a bit some work to improve the situation on numpy's side,
efforts which were integrated in numpy 1.0.2. Now, when you clip a numpy
array with scalar min and max values, you get a 5 to 30 fold speed-up;
to get the maximum efficiency, you need inplace clipping (using the
syntax a.clip(min, max, a) for a a numpy array). This makes image
significantly faster (between 100 and 200 ms on recent computers), and I
am sure in other functionalities of matplotlib as well.
cheers,
David
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