Input data, in any form that can be converted to a NumPy array.
data_format
Image data format, can be either "channels_first" or "channels_last". Defaults to None, in which case the global setting keras.backend.image_data_format() is used (unless you changed it, it defaults to "channels_last").
scale
Whether to rescale the image such that minimum and maximum values are 0 and 255 respectively. Defaults to True.
dtype
Dtype to use. None means the global setting keras.backend.floatx() is used (unless you changed it, it defaults to "float32"). Defaults to None.