diff --git a/sigal/gallery.py b/sigal/gallery.py
index e3da1e5..8947ffb 100644
--- a/sigal/gallery.py
+++ b/sigal/gallery.py
@@ -82,6 +82,9 @@ class Media:
 
         self.logger = logging.getLogger(__name__)
         self._get_metadata()
+        # default: title is the filename
+        if not self.title:
+            self.title = self.filename
         signals.media_initialized.send(self)
 
     def __repr__(self):
@@ -111,7 +114,12 @@ class Media:
             if not isfile(big_path):
                 copy(self.src_path, big_path,
                      symlink=s['orig_link'])
-            return url_from_path(join(s['orig_dir'], self.src_filename))
+            return join(s['orig_dir'], self.src_filename)
+
+    @property
+    def big_url(self):
+        """URL of the original media."""
+        return url_from_path(self.big)
 
     @property
     def thumbnail(self):
@@ -142,8 +150,7 @@ class Media:
         """ Get image metadata from filename.md: title, description, meta."""
         self.description = ''
         self.meta = {}
-        # default: title is the filename
-        self.title = self.filename
+        self.title = ''
 
         descfile = splitext(self.src_path)[0] + '.md'
         if isfile(descfile):
diff --git a/sigal/themes/colorbox/templates/album_list.html b/sigal/themes/colorbox/templates/album_list.html
index c408a47..7e67953 100644
--- a/sigal/themes/colorbox/templates/album_list.html
+++ b/sigal/themes/colorbox/templates/album_list.html
@@ -35,7 +35,7 @@
 
   {% if album.medias %}
   {% macro img_description(media) -%}
-    {% if media.big %} data-big="{{ media.big }}"{% endif %}
+    {% if media.big %} data-big="{{ media.big_url }}"{% endif %}
     {% if media.exif %}
       {% if media.exif.datetime %}
         data-date=", {{ media.exif.datetime }}"
@@ -70,7 +70,7 @@
           {% else %}
           <a href="#{{ mhash }}" class="gallery" inline='yes' title="{{ media.filename }}"
           {% endif %}
-            {% if media.big %} data-big="{{ media.big }}"{% endif %}>
+            {% if media.big %} data-big="{{ media.big_url }}"{% endif %}>
             <img src="{{ media.thumbnail }}" alt="{{ media.filename }}"
                 title="{{ media.title }}" /></a>
         </div>
diff --git a/sigal/themes/galleria/templates/album.html b/sigal/themes/galleria/templates/album.html
index bd8f320..d093e16 100644
--- a/sigal/themes/galleria/templates/album.html
+++ b/sigal/themes/galleria/templates/album.html
@@ -47,7 +47,7 @@
 
 {% block late_js %}
     {% macro img_description(media) -%}
-      {%- if media.big -%}<a href='{{ media.big }}'>Full size</a>{%- endif -%}
+      {%- if media.big -%}<a href='{{ media.big_url }}'>Full size</a>{%- endif -%}
 	    {# clean up tags and whitespace, including newlines, in the description #}
       {%- if media.description -%}<br>{{ media.description | striptags }}{%- endif -%}
       {%- if media.exif -%}
@@ -85,7 +85,7 @@
         description: "{{ img_description(media) | e }}",
         thumb: "{{ media.thumbnail }}",
         {% if media.big %}
-        big: "{{ media.big }}",
+        big: "{{ media.big_url }}",
         {% endif %}
         {% if media.type == "image" %}
         image: "{{ media.filename }}"
diff --git a/tests/test_gallery.py b/tests/test_gallery.py
index e580ac7..2f58cf5 100644
--- a/tests/test_gallery.py
+++ b/tests/test_gallery.py
@@ -62,7 +62,7 @@ REF = {
         'title': 'video',
         'name': 'video',
         'thumbnail': ('video/thumbnails/'
-                      'example video.tn.jpg'),
+                      'example%20video.tn.jpg'),
         'subdirs': [],
         'medias': ['example video.ogv']
     }
@@ -100,7 +100,7 @@ def test_media_orig(settings, tmpdir):
 
     m = Video('example video.ogv', 'video', settings)
     assert m.filename == 'example video.webm'
-    assert m.big == 'original/example video.ogv'
+    assert m.big_url == 'original/example%20video.ogv'
     assert os.path.isfile(join(settings['destination'], m.path, m.big))
 
     settings['use_orig'] = True
@@ -145,7 +145,7 @@ def test_video(settings, tmpdir):
     assert m.dst_path == join(settings['destination'], file_path)
 
     os.makedirs(join(settings['destination'], 'video', 'thumbnails'))
-    assert m.thumbnail == join('thumbnails', 'example video.tn.jpg')
+    assert m.thumbnail == join('thumbnails', 'example%20video.tn.jpg')
     assert os.path.isfile(m.thumb_path)