From what I’ve seen you can alter the resolution of a frame using the following code using OpenCV:

cap = cv2.VideoCapture(0)  # Adjust index if necessary
cap.set(cv2.CAP_PROP_FRAME_WIDTH, 640)   
cap.set(cv2.CAP_PROP_FRAME_HEIGHT, 480)

But when I do this it essentially crops the image, zooming in so to speak. I want the acquisition field to remain the same size and lower the resolution. Are the commands listed not how one achieves this?

I also tried to lower resolution using

cap.set(3,480)
cap.set(4,640)

but the result is the exact same unfortunately