Python PIL Image: Aligning RGBA Channels from NumPy Array

To align the RGBA channels in a PIL image from a numpy array, you can use the following code:

import numpy as np
from PIL import Image

# create a numpy array with shape (height, width, 4) for RGBA channels
arr = np.zeros((100, 100, 4), dtype=np.uint8)
arr[:, :, 0] = 255  # set the red channel to 255

# create a PIL image from the numpy array
img = Image.fromarray(arr, mode='RGBA')

# align the RGBA channels
r, g, b, a = img.split()
img = Image.merge('RGBA', (b, g, r, a))

# display the image
img.show()

In this example, we create a numpy array with shape (100, 100, 4) for RGBA channels and set the red channel to 255. Then we create a PIL image from the numpy array and split it into four separate channels. We merge the channels in the order of blue, green, red, and alpha to align them properly. Finally, we display the image using the show() method.