Python: Array with too many Indices?

Question

I'm trying to understand the code below and what it does:

im = pilimage.open(img_path)
image_array = np.array(im)
imgstack = image_array[area[0]:area[1],
                       area[2]:area[3], z_stack[0]:z_stack[1]]

I know that it opens up an image and stores it in im and then converts im into an array and stores that in image_array. What I don't really understand is the last part. I don't have that much experience with python syntax so can anyone help me. Thank you so much!

A "reverse duplicate" of stackoverflow.com/questions/17277100/…. It's slicing the array in 3 dimensions. — Carcigenicate
– Carcigenicate, Commented Oct 2, 2019 at 19:48

Tim Jones · Accepted Answer · 2019-10-02 20:11:38Z

0

This is an advanced-ish application of the python slice notation which you can learn about here: Understanding slice notation. There are a couple nuances here though:

area[0]:area[1] is taking the int at these two indexes and making a slice start:end of the image_array following the normal rules.
Only numpy arrays support the ability to slice n-dimensions at the same time. https://docs.scipy.org/doc/numpy-1.13.0/reference/arrays.indexing.html

answered Oct 2, 2019 at 20:11

Tim Jones

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