How to tell a null image from a valid image?

Question

I test a code, with one of its outputs is an image. I need to make sure the image has a valid output, but if it is a NULL, I seem to can't tell from a valid image in the inspection section.

The only difference I could tell is a field called src where a null image may appear like this:

Whereas for valid images, the src field is MUCH longer. Is there a python command which analyzes an image via a link to see if it is too... "white"?

Also, I did notice that in the field I just quoted here there is a repeating substring "pAZBhWgBkmBYAGaYFQIZ". is this significant?

Does this answer your question? Check if a string is encoded in base64 using Python — 0stone0
– 0stone0, Commented Mar 24, 2021 at 16:15
bigger problem there is lack of quotes around the src methinks... you can create an image object out of the base64 text and check various things. (Size would probably be a good indicator...but null would be easy to catch) — browsermator
– browsermator, Commented Mar 24, 2021 at 17:02
That's a "valid" image by most criteria; how exactly would you define "null image"? — tripleee
– tripleee, Commented Apr 30, 2021 at 5:00

tripleee · Accepted Answer · 2021-04-30 04:59:10Z

-1

If you just want to check whether an image is currently present at a specific URL, there is quite an easy way to check that.

from urllib.request import urlopen
import requests
image_formats = ("image/png", "image/jpeg", "image/gif")
url = "http://localhost/img.png"
site = urlopen(url)
meta = site.info()  # get header of the http request
if meta["content-type"] in image_formats:  
    print("it is an image")

More such solutions/alternatives can be found in check if a URL to an image is up and exists in Python

edited Apr 30, 2021 at 4:59

tripleee

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answered Mar 24, 2021 at 16:44

Abdul Rehman

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