django simple_tag to get a thumbnail from "media/", using sorl-thumbail without adding the hostname

my_template.html

{% load mytemplatetags %}

<img src="{% get_thumbail_from_media 'my-image-inside-media-folder.png' '100x75' format='PNG' %}"/>

mytemplatetags.py

from django import template
import os
from sorl.thumbnail import get_thumbnail
from django.conf import settings

register = template.Library()


@register.simple_tag
def get_thumbail_from_media(image, *args, **kwargs):
    image_path = os.path.join(settings.MEDIA_ROOT, image)
    return get_thumbnail(image_path, *args, **kwargs).url