How to convert RGB PIL image to numpy array with 3 channels?

The fourth layer is the transparency value for image formats that support transparency, like PNG. If you remove the 4th value it’ll be a correct RGB image without transparency.

EDIT:

Example:

>>> import PIL.Image
>>> image = PIL.Image.open('../test.png')
>>> import numpy as np
>>> image = np.array(image)
>>> image.shape
(381, 538, 4)
>>> image[...,:3].shape
(381, 538, 3)