2. Image open

See: https://pillow.readthedocs.io/en/stable/reference/Image.html#PIL.Image.open
See: https://pillow.readthedocs.io/en/stable/reference/open_files.html#file-handling

2.1. Open file in the same folder

The code below opens an image and shows it.
Use with to automatically close the file resource.
To refer to the image object as im, use as im.
The file below is assumed to be in the same folder as the python script.
from PIL import Image

with Image.open("tri.png") as im:
    im.show()
../_images/tri.png

2.2. Open file in a subfolder

The file below is in the “shapes” folder within the folder containing the python script.
from PIL import Image

with Image.open("shapes/tri.png") as im:
    im.show()
../_images/tri.png

2.3. Open file from a url

The code below uses the urllib.request library to help open an image url.
from PIL import Image
from urllib.request import urlopen

url = "https://pc-pillow.readthedocs.io/en/latest/_images/tri.png"

with Image.open(urlopen(url)) as im:
    im.show()
../_images/tri.png