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 https://stackoverflow.com/questions/17277100/python-slicing-a-multi-dimensional-array. It's slicing the array in 3 dimensions. — Carcigenicate, Oct 02 '19 at 19:48

score 0 · Answer 1 · answered Oct 02 '19 at 20:11

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

Python: Array with too many Indices?

1 Answers1