OpenCV 转换成 PIL.Image 格式：
import cv2
from PIL import Image
import numpy
img = cv2.imread("1.jpg")
print(img.shape)
print(type(img))
cv2.imshow("OpenCV",img)
image = Image.fromarray(cv2.cvtColor(img,cv2.COLOR_BGR2RGB))
image.show()
#让显示等待键盘输入维持在那里，否则程序跑完就闪退啦！
cv2.waitKey(0)
# output:
# (256, 256, 3)
# <class 'numpy.ndarray'>
PIL.Image 转换成 OpenCV 格式：
import cv2
from PIL import Image
import numpy
image = Image.open("1.jpg")
# print(img.shape) # Image has no attribute 'shape'
print(np.array(img).shape)
print(type(img))
image.show()
img = cv2.cvtColor(numpy.asarray(image),cv2.COLOR_RGB2BGR)
cv2.imshow("OpenCV",img)
cv2.waitKey(0)
# output:
# (256, 256, 3)
# <class 'Image'>