Convert RGB stream to grayscale using DepthAI ImageManip node

main.py

import cv2
import depthai as dai

pipeline = dai.Pipeline()

cam = pipeline.create(dai.node.ColorCamera)
cam.setCamera("color")
cam.setResolution(dai.ColorCameraProperties.SensorResolution.THE_1080_P)

manip = pipeline.create(dai.node.ImageManip)
manip.initialConfig.setResize(300, 300)
manip.initialConfig.setFrameType(dai.ImgFrame.Type.GRAY8)

manipOut = pipeline.create(dai.node.XLinkOut)
manipOut.setStreamName("manip")

camOut = pipeline.create(dai.node.XLinkOut)
camOut.setStreamName("cam")

cam.video.link(manip.inputImage)
manip.out.link(manipOut.input)
cam.video.link(camOut.input)


with dai.Device(pipeline) as device:
    qManip = device.getOutputQueue("manip", maxSize=4, blocking=False)
    qCam = device.getOutputQueue("cam", maxSize=4, blocking=False)

    while True:
        inManip = qManip.tryGet()
        inCam = qCam.tryGet()

        if inManip is not None:
            cv2.imshow("manip", inManip.getCvFrame())

        if inCam is not None:
            cv2.imshow("cam", inCam.getCvFrame())

        if cv2.waitKey(1) == ord('q'):
            break