import cv2


def callback(index):
    cvt_img = cv2.cvtColor(img, css[index])
    cv2.imshow('color', cvt_img)


cv2.namedWindow('color', cv2.WINDOW_NORMAL)
img = cv2.imread('imgs/RMB.jpeg')

css = [
    cv2.COLOR_BGR2RGBA,
    cv2.COLOR_BGR2BGRA,
    cv2.COLOR_BGR2GRAY,
    cv2.COLOR_BGR2HSV_FULL,
    cv2.COLOR_BGR2YUV
]
cv2.createTrackbar('curcolor', 'color', 0, len(css) - 1, callback)
callback(0)
cv2.waitKey(0)