我有以下代码从目录中读取jpeg图像：

data_dir_str = "./photo/pults/samsung_small"
data_dir = pathlib.Path(data_dir_str)
image_count = len(list(data_dir.glob('*.*')))
print('images in directory: ' + str(image_count)) # 12 files in directory

sams_pults = list(data_dir.glob('*.jpg'))
img = PIL.Image.open(str(sams_pults[0]))
img_width, img_height = img.size
#img.show()  # This works well - shows image

batch_size = 10

train_ds = tf.keras.utils.image_dataset_from_directory(
  data_dir_str, #data_dir,
  validation_split=0.2,
  subset="training",
  #seed=123,
  image_size=(img_height, img_width),
  batch_size=batch_size
)

即使img.show()可以显示图像，tf.keras.utils.image_dataset_from_directory()也会显示错误：
在目录{directory}中未找到图像。允许的格式：{ALLOWLIST_FORMATS}