CODEWITHSUNDEEP
pythonimagenumpy
Brkk
Brkk

Reputation: 607

How to read large images as numpy.memmap objects

How can one read large images as numpy.memmap objects so it is possible to manipulate their pixels and save them back? Thanks in advance.

Upvotes: 4

Views: 1616

Answers (1)

user1898037
user1898037

Reputation: 293

Without knowing further deatils, I would use scipy.misc.imread. Scipy uses Pillow, which in turn uses mmap:

>>> from scipy import misc
>>> pix_array = misc.imread('image_fname') # read only
>>> type(pix_array)
<type 'numpy.ndarray'>
>>> # manipulate pix_array to get `altered_pix_array`
>>> misc.imsave('altered_image_fname', altered_pix_array)

If scipy.misc.imread does not work right out of the box, try pip install pillow to install/reinstall Pillow properly. GL+HF

Upvotes: 1

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