8. Image getchannel

See: https://pillow.readthedocs.io/en/stable/reference/Image.html#PIL.Image.Image.getchannel

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8.1. Getchannel

Use the Image.getchannel(channel) returns an image, in “L” mode (greyscale), containing a single channel of the source image.

channel - Could be index (0 for “R” channel of “RGB”) or channel name (“A” for alpha channel of “RGBA”).

from PIL import Image

with Image.open("test_images/alph_blocks.png") as im:
    im1 = im.getchannel("R")
    # im1.show()
    im1.save("Image/Image_channel_R.png")
    im1 = im.getchannel("G")
    # im1.show()
    im1.save("Image/Image_channel_G.png")
    im1 = im.getchannel("B")
    # im1.show()
    im1.save("Image/Image_channel_B.png")