Python PIL 的image类和numpy array之间的互换

import cv2
import numpy as np
from PIL import Image
from PIL import ImageEnhance

def getline(frame):

img = Image.fromarray(frame.astype('uint8')).convert('RGB')
enh_col = ImageEnhance.Color(img)
color = 1.5
image_colored = enh_col.enhance(color)
enh_con = ImageEnhance.Contrast(image_colored)
contrast = 1.5
image_colored = enh_con.enhance(contrast)

frame = np.array(image_colored)
cv2.imshow("img1",frame)