Beginners • Re: warning message when reading .jpg file on RPi4b with cv2

Code:

#test GPIO program using interruptsimport RPi.GPIO as GPIOimport timeimport cv2state = 0#defines of input pin, output pin, and modeBUTTON_PIN = 16     # I/O header pin 36 ; GPIO16LED_PIN = 4         # I/O header pin 7 ; GPIO4GPIO.setmode(GPIO.BCM)#define function to respond to pin interrupt (define before calling)def button_callback(channel):    if GPIO.input(BUTTON_PIN) == GPIO.HIGH:        print("Button has been released")        GPIO.output(LED_PIN, False)    else:        print("Button has been pressed")        GPIO.output(LED_PIN, True)#set up the pin directions and register interrupt routine    GPIO.setup(BUTTON_PIN, GPIO.IN, GPIO.PUD_UP)GPIO.setup(LED_PIN, GPIO.OUT, GPIO.PUD_OFF, False)GPIO.add_event_detect(BUTTON_PIN,GPIO.BOTH,                      callback=button_callback,                      bouncetime=100)#loop to try to execute background ... bails if <ctrl>+Ctry:    while True:     # background operation goes here        if state == 0:            img_bgr = cv2.imread('egret_640_480.jpg')            img_gray = cv2.cvtColor(img_bgr, cv2.COLOR_BGR2GRAY)            cv2.imshow("Color", img_bgr)            cv2.imshow("Gray", img_gray)                        state = 1        else:            print("loop...")            time.sleep(1)            except KeyboardInterrupt:    GPIO.cleanup()    cv2.waitKey(0)    cv2.destroyAllWindows()