import base64
import mimetypes

def image_as_base64(image_file):
    """
    :param `image_file` for the complete path of image.
    :param `format` is format for image, eg: `png` or `jpg`.
    """
    # if not os.path.isfile(image_file):
    #    return None

    encoded_string = ""
    # with open(image_file, 'rb') as img_f:
    #    encoded_string = base64.b64encode(img_f.read())
    encoded_string = base64.b64encode(image_file.file.read())
    mimetype, enc = mimetypes.guess_type(image_file.path)
    if "dicom" in mimetype:
        return "data:{};base64,{}".format(mimetype, encoded_string.decode("utf-8"))
    return "data:image/{};base64,{}".format(mimetype, encoded_string.decode("utf-8"))