base64encode image from camera flutter

Question

i am trying to encode image to base64 to send to server. the base 64 string i am getting from image is not valid.

i can display image captured from camera. its not encoding to base64 properly.

File img;
 void getPic() async {
    img = await ImagePicker.pickImage(source: ImageSource.camera);
    if (img != null) {
      print(img);
      List<int> imageBytes = await img.readAsBytes();
      base64Image =  base64Encode(imageBytes);
      print(base64Image);
      setState(() => base64Image);
    }
  }