imsave ignores origin option

For me, the imsave option origin="lower" is silently ignored when saving to PNG.

If I execute this script, the resulting two images are identical:

import numpy as np
from matplotlib.image import imsave

image = np.arange(30*20).reshape((20, 30))
imsave('lower.png', image, origin='lower')
imsave('upper.png', image, origin='upper')

Is this a MPL bug?

Version info: Python 3.5 as well as Numpy and MPL installed via macports, then MPL 2.0.0rc2 via pip in user site-packages, i.e. this is with MPL 2.0.0rc2.

lower.png is here:

upper.png is here:

import numpy as np
from matplotlib.image import imsave

image = np.arange(30*20).reshape((20, 30))

fig, (ax1, ax2) = plt.subplots(1, 2)
ax1.imshow(image, origin='lower')
ax2.imshow(image, origin='upper')

Fortunately this is a bug in imsave and not in Axes.imshow

imsave is efficient and skips the standard draw machirary (and just uses AxesImage.write_png) which ignores the origin state.

Exact work:

add check in AesImage.write_png for the origin state and flip color mapped imaged if needed.

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imsave ignores origin option #7656

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imsave ignores origin option #7656

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tacaswell commented on Dec 21, 2016

tacaswell commented on Dec 21, 2016

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