colorpicker.py

import cv2
import numpy as np

frameWidth = 640
frameHeight = 480
cap = cv2.VideoCapture(0)
cap.set(3, frameWidth)
cap.set(4, frameHeight)
cap.set(10, 150)

def empty(a):
    pass

cv2.namedWindow("HSV")
cv2.resizeWindow("HSV", 640, 240)
cv2.createTrackbar("Hue Min","HSV",0,179,empty)
cv2.createTrackbar("Sat Max","HSV",0,255,empty)
cv2.createTrackbar("Val Min","HSV",0,255,empty)
cv2.createTrackbar("Hue Max","HSV",179,179,empty)
cv2.createTrackbar("Sat Min","HSV",255,255,empty)
cv2.createTrackbar("Val Max","HSV",255,255,empty)

while True:
    _, img = cap.read()
    imgHsv = cv2.cvtColor(img,cv2.COLOR_BGR2HSV)
    h_min = cv2.getTrackbarPos("Hue Min","HSV")
    h_max = cv2.getTrackbarPos("Hue Max", "HSV")
    s_min = cv2.getTrackbarPos("Sat Min", "HSV")
    s_max = cv2.getTrackbarPos("Sat Max", "HSV")
    v_min = cv2.getTrackbarPos("Val Min", "HSV")
    v_max = cv2.getTrackbarPos("Val Max", "HSV")
    print(h_min)
    lower = np.array([h_min,s_min,v_min])
    upper = np.array([h_max,s_max,v_max])
    mask = cv2.inRange(imgHsv,lower,upper)
    result = cv2.bitwise_and(img,img,mask=mask)
    mask = cv2.cvtColor(mask,cv2.COLOR_GRAY2BGR)
    hStack = np.hstack([img,mask,result])
    cv2.imshow("Horizontal Stacking",hStack)
    if cv2.waitKey(1) & 0xFF == ord('q'):
        break

cap.release()
cv2.destroyAllWindows()