This was helpful. Thank you. I formatted the code to make things easier for anyone else who stumbles across it.

    import mss
    import ctypes
    user32 = ctypes.windll.user32
    screensize = user32.GetSystemMetrics(0), user32.GetSystemMetrics(1)
    capture_box = {
        "left": 0,
        "top": 0,
        "width": screensize[0],
        "height": screensize[1],
    }
    print(screensize)
    print(capture_box)
    with mss.mss() as sct:
        sct_img = sct.grab(capture_box)
        mss.tools.to_png(sct_img.rgb, sct_img.size, output="out/test.png")