ファイルをbytesで読み込んで、plt.show()可能なnumpy形式までの変換を丁寧にみていく - Qiita

import matplotlib.pyplot as plt import numpy as np import cv2 # 型確認のための汎用メソッド def showDetail(obj,name): obj_type = type(obj) print(f"type({name})",obj_type) if obj_type == np.ndarray: print(f"{name}.shape",obj.shape) filename = 'images/testImage.jpg' # Read image into memory payload = None with open(filename, 'rb') as f: payload = f.read() showDetail(payload,"payload") # type(payload) <class 'byte