@bgfp 更正： 将with open("img.jpg", "w") as f:
改为with open("img.jpg", "wb") as f:
python2和python3均可正常保存图片，只不过对于python3，ser.write("snap\r\n")要改成ser.write("snap\r\n".encode())

串口发送的python是3.0版本，串口接收的python也必须是3.0版本.用python2接受openMV用python3发送的图片就花