Handling large images with OpenCV.

[Apenz1]

Hello, I am trying to focus stack images using this code: https://github.com/momonala/focus-stack

The problem I'm having is that cv2 loads all images inside of the RAM memory. This gets filled up quite quickly (8GB) and crashes my computer.
Is there a way to not load the image arrays inside of RAM?
If there is, how would I implement that in this code?

Thanks for your help.