diff --git a/afpy.py b/afpy.py
index 6492264..1caa267 100644
--- a/afpy.py
+++ b/afpy.py
@@ -2,7 +2,6 @@ import email
 import locale
 import os
 import time
-from pathlib import Path
 
 import docutils.core
 import docutils.writers.html5_polyglot
@@ -59,12 +58,11 @@ def index():
     for post in data.get_posts(data.POST_ACTUALITIES, end=4):
         timestamp = post[data.TIMESTAMP]
         posts[timestamp] = post
-        if (post[data.DIR] / 'post.jpg').is_file():
-            posts[timestamp]['image'] = '/'.join(
-                (data.POST_ACTUALITIES, data.STATE_PUBLISHED, timestamp)
-            )
     return render_template(
-        'index.html', body_id='index', name=data.POST_ACTUALITIES, posts=posts
+        'index.html',
+        body_id='index',
+        name=data.POST_ACTUALITIES,
+        posts=posts
     )
 
 
@@ -90,7 +88,10 @@ def rest(name):
     except FileNotFoundError:
         abort(404)
     return render_template(
-        'rst.html', body_id=name, html=parts['body'], title=parts['title']
+        'rst.html',
+        body_id=name,
+        html=parts['body'],
+        title=parts['title']
     )
 
 
@@ -128,7 +129,11 @@ def edit_post_admin(name, timestamp):
     if not post:
         abort(404)
     return render_template(
-        'edit_post.html', body_id='edit-post', post=post, name=name, admin=True
+        'edit_post.html',
+        body_id='edit-post',
+        post=post,
+        name=name,
+        admin=True
     )
 
 
@@ -153,7 +158,10 @@ def save_post(name, token=None):
     edit_post_url = url_for(
         'edit_post', name=name, token=signer.dumps(post['_timestamp'])
     )
-    return render_template('confirmation.html', edit_post_url=edit_post_url)
+    return render_template(
+        'confirmation.html',
+        edit_post_url=edit_post_url
+    )
 
 
 @app.route('/admin/post/edit/<name>/<timestamp>', methods=['post'])
@@ -185,10 +193,6 @@ def posts(name, page=1):
     ):
         timestamp = post[data.TIMESTAMP]
         posts[timestamp] = post
-        if (Path(str(timestamp)) / 'post.jpg').is_file():
-            posts[timestamp]['image'] = '/'.join(
-                (name, data.STATE_PUBLISHED, timestamp)
-            )
     return render_template(
         'posts.html',
         body_id=name,
@@ -226,21 +230,24 @@ def post(name, timestamp):
     post = data.get_post(name, timestamp, data.STATE_PUBLISHED)
     if not post:
         abort(404)
-    if (post[data.DIR] / 'post.jpg').is_file():
-        post['image'] = '/'.join((name, data.STATE_PUBLISHED, timestamp))
-    return render_template('post.html', body_id='post', post=post, name=name)
+    return render_template(
+        'post.html',
+        body_id='post',
+        post=post,
+        name=name
+    )
 
 
-@app.route('/post_image/<path:path>/post.jpg')
+@app.route('/post_image/<path:path>')
 def post_image(path):
-    if path.count('/') != 2:
+    if path.count('/') != 3:
         abort(404)
-    name, status, timestamp = path.split('/')
-    if name not in data.POSTS:
+    category, state, timestamp, name = path.split('/')
+    if category not in data.POSTS:
         abort(404)
-    if status not in data.STATES:
+    if state not in data.STATES:
         abort(404)
-    return send_from_directory(data.root / path, 'post.jpg')
+    return send_from_directory(data.root, path)
 
 
 @app.route('/feed/<name>/rss.xml')
diff --git a/data_xml.py b/data_xml.py
index bb7fe1a..d8360f3 100644
--- a/data_xml.py
+++ b/data_xml.py
@@ -16,6 +16,7 @@ ACTION_PUBLISH = 'publish'
 ACTION_UNPUBLISH = 'unpublish'
 ACTIONS = {ACTION_PUBLISH: "Publier", ACTION_UNPUBLISH: "Dépublier"}
 
+IMAGE = '_image'
 TIMESTAMP = '_timestamp'
 STATE = '_state'
 PATH = '_path'
@@ -23,6 +24,7 @@ DIR = '_dir'
 
 BASE_DIR = 'posts'
 BASE_FILE = 'post.xml'
+BASE_IMAGE = 'post.jpg'
 
 
 class DataException(Exception):
@@ -75,7 +77,12 @@ def get_post(category, timestamp, states=None):
         return None
     tree = ElementTree.parse(path)
     post = {item.tag: (item.text or '').strip() for item in tree.iter()}
-    post[TIMESTAMP] = int(timestamp)
+
+    # Calculated fields
+    image = post.get('image') or BASE_IMAGE
+    if (dir / image).is_file():
+        post[IMAGE] = '/'.join((category, state, timestamp, image))
+    post[TIMESTAMP] = timestamp
     post[STATE] = state
     post[DIR] = dir
     post[PATH] = path
diff --git a/templates/index.html b/templates/index.html
index 068b885..ff949cc 100644
--- a/templates/index.html
+++ b/templates/index.html
@@ -27,8 +27,8 @@
         <time pubdate datetime="{{ post.published }}">
           {{ post.published | parse_iso_datetime('%x') }}
         </time>
-        {% if post.image %}
-          <img src="{{ url_for('post_image', path=post.image) }}" alt="{{ post.title }}" />
+        {% if post._image %}
+          <img src="{{ url_for('post_image', path=post._image) }}" alt="{{ post.title }}" />
         {% endif %}
         {{ post.summary | safe }}
         <p><a href="{{ url_for('post', name=name, timestamp=timestamp) }}">Lire la suite…</a></p>
diff --git a/templates/post.html b/templates/post.html
index 8adb314..0a0edb3 100644
--- a/templates/post.html
+++ b/templates/post.html
@@ -14,8 +14,8 @@
         {{ post.summary | safe if post.summary }}
       </em>
     </p>
-    {% if post.image %}
-      <img src="{{ url_for('post_image', path=post.image) }}" alt="{{ post.title }}" />
+    {% if post._image %}
+      <img src="{{ url_for('post_image', path=post._image) }}" alt="{{ post.title }}" />
     {% endif %}
     {{ post.content | safe }}
   </article>
diff --git a/templates/posts.html b/templates/posts.html
index 2dd8567..0ba907d 100644
--- a/templates/posts.html
+++ b/templates/posts.html
@@ -15,8 +15,8 @@
       <time pubdate datetime="{{ post.published }}">
         {{ post.published | parse_iso_datetime('%x') }}
       </time>
-      {% if post.image %}
-        <img src="{{ url_for('post_image', path=post.image) }}" alt="{{ post.title }}" />
+      {% if post._image %}
+        <img src="{{ url_for('post_image', path=post._image) }}" alt="{{ post.title }}" />
       {% endif %}
       {{ post.summary | safe if post.summary }}
       <p><a href="{{ url_for('post', name=name, timestamp=timestamp) }}">Lire la suite…</a></p>