Trying to find an example of how to capture screen to file via python? As a way to figure out why openCV and modules pyautoGUI fail on Pi OS. Tried several methods of trying to capture the desktop and then search that capture for a given 'png' file match in said screen capture. Each example fails stated it does not have authority to read display:0. Really suck, any help appreciated.

try...

import os
os.system("grim test.png")

Schorschi wrote: ↑

Fri Oct 24, 2025 12:56 am

... does not have authority to read display:0

Are you trying to do this remotely? That adds at least one layer of complication.

Gordon's method works, at least for local access.

‘Remember the Golden Rule of Selling: "Do not resort to violence."’ — McGlashan.
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try here if using ssh

https://raspberrytips.com/screenshots-raspberry-pi-os/

in the console type in

man scrot

'scrot' runs, but does not work with recent OS using 'wayland'. Produces just plain black images. 'grim' works with 'wayland'.