controls_2.py

#!/usr/bin/python3

# Another (simpler!) way to fix the AEC/AGC and AWB.

from qt_gl_preview import *
from picamera2 import *
import time

picam2 = Picamera2()
preview = QtGlPreview(picam2)

preview_config = picam2.preview_configuration()
picam2.configure(preview_config)

picam2.start()
time.sleep(1)

picam2.set_controls({"AwbEnable": 0, "AeEnable": 0})
time.sleep(5)