MerPiPi

# Models.py
#Inicio de la foto
foto = models.ImageField(upload_to='user', null=True, blank=True)

@receiver(post_save , sender=UsuarioInformacion, dispatch_uid="update_foto")
def rename_user(sender, instance, update_fields, **kwargs):
    if instance.foto:
        ext = instance.foto.name.split('.')[-1]
        filename = 'user/{}.jpeg'.format(instance.pk)
        direccion = os.path.join(settings.MEDIA_ROOT, instance.foto.name)
        dir_file = os.path.join(settings.MEDIA_ROOT, filename)

        baseWidth = 300, 600
        img = Image.open(direccion)
        #widthPercent = (baseWidth / float(img.size[0]))
        #height = int((float(img.size[1]) * float(widthPercent)))
        #img = img.resize((baseWidth, height), Image.BILINEAR)
        img.thumbnail(baseWidth, Image.ANTIALIAS)
        img.save(dir_file, "jpeg")
        #img.save(dir_file)

        if str(dir_file) != (direccion):
            os.remove(direccion)
            UsuarioInformacion.objects.filter(pk=instance.pk).update(foto=filename)

@receiver(post_delete , sender=UsuarioInformacion, dispatch_uid="delete_foto")
def mymodel_delete(sender, instance, **kwargs):
    if instance.foto:
        instance.foto.delete(False)

#Fin de la foto


#Template
#Inicio Foto
<form method="POST">
    <div class="form-body">
        <div class="form-group">
            <label for="foto">Foto de Perfil</label>
            <input type="file" name="foto" />
        </div>
    </div>
    <button type="submit" class="btn btn-success">Guardar</button>
</form>