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import cv2
import numpy as np
import os

""" 读取图片 """
def get_file_content(filePath):
    with open(filePath, 'rb') as fp:
        return fp.read()
#PNG图像(便携式网络图形（Portable Network Graphics）)
#是一种典型的4通道图像。alpha通道可以赋值0到1，或者0到255，表示透明到不透明，但是一般直接imshow()是看不出什么效果来的

def save_jpg(fstream, fname):
    nparr = np.fromstring(fstream, np.uint8)
    orgimage = cv2.imdecode(nparr, cv2.IMREAD_UNCHANGED)
    if len(cv2.split(orgimage)) > 3:
        orgimage[np.all(orgimage == [0, 0, 0, 0], axis=2)] = [255, 255, 255, 0]
    print(len(cv2.split(orgimage)))
    savepath = fname[:-4] + '.jpg'
    print(savepath)
    cv2.imwrite(savepath, orgimage)


if __name__ == '__main__':
    image_name = '000284.jpg'
    image_file = get_file_content(image_name)
    save_jpg(image_file, image_name)