I think I found this a while ago but right now I don't seem to find anything when googleing.
I have a model Location:
class Location(models.Model):
    name = models.CharField(max_length=200)
    image = models.ImageField(blank=true);
and a JSON file mydata.json that will load initial data:
[
  {
    "model": "locations.location",
    "fields": {
      "name": "Cafe"
    }
  }
]
and then when I do python manage.py loaddata mydata it loads the data. So now I am wondering if it's possible to load in a picture as well generated from the json. I don't mean just a link like here I mean a format that generates an image after. I think I read somewhere that it is possible I just can't find it anymore. 
Anyone an idea?