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You have to override save() method of model Visage to do some actions with data after saving.
Change your_project_name appropriately.
from your_project_name.settings import MEDIA_ROOT
class Visage(models.Model):
...
def save(self):
super(Visage, self).save()
filename = os.path.abspath(os.path.join(MEDIA_ROOT, self.image.name)
traitement(filename)
Source:stackexchange.com