python处理图片格式的数据

import pandas as pd
import numpy as np
import PIL
from PIL import Image
file = (r'd:\user\01378237\桌面\river.jpg')
img = Image.open(file,mode='r')
box = (10,10,500,500)
region = img.crop(box)
region.save(r'd:\user\01378237\桌面\cutting.jpg')
#img.show()
print ('img format: ', img.format) # 打印图像格式
print ('img size: ', img.size) # 打印图像尺寸
print ('img mode: ', img.mode)
img_gray = img.convert('F') # 转换为灰度模式
img_gray.show() #