How to read image from numpy array into PIL Image?

Question

I am trying to read an image from a numpy array using PIL, by doing the following:

from PIL import Image
import numpy as np
#img is a np array with shape (3,         


        

Answer 1

You don't need to reshape. This is what rollaxis is for:

Image.fromarray(np.rollaxis(img, 0,3))

Answer 2

Try

img = np.reshape(256, 256, 3)
Image.fromarray(img)

Answer 3

Defining the datatype of the numpy array to np.uint8 fixed it for me.

>>> img = np.full((256, 256), 3)
>>> Image.fromarray(img)
...
line 2753, in fromarray
raise TypeError("Cannot handle this data type: %s, %s" % typekey) from e
TypeError: Cannot handle this data type: (1, 1), <i8

So defining the array with the proper datatype:

>>> img = np.full((256, 256), 3, dtype=np.uint8)
>>> Image.fromarray(img)
<PIL.Image.Image image mode=L size=256x256 at 0x7F346EA31130>

creates the Image object successfully

Or you could simply modify the existing numpy array:

img = img.astype(np.uint8)