diff --git a/app/models/uploaded_file.rb b/app/models/uploaded_file.rb
index 50a033e..4ce2b26 100644
--- a/app/models/uploaded_file.rb
+++ b/app/models/uploaded_file.rb
@@ -10,7 +10,7 @@ class UploadedFile < Article
   #  :min_size => 2.megabytes
   #  :max_size => 5.megabytes
   has_attachment :storage => :file_system,
-    :thumbnails => { :icon => [24,24], :thumb => '130x130>' },
+    :thumbnails => { :icon => [24,24], :thumb => '130x130>', :display => [640,480] },
     :thumbnail_class => Thumbnail,
     :max_size => 5.megabytes
 
@@ -50,7 +50,7 @@ class UploadedFile < Article
   include ActionView::Helpers::TagHelper
 
   def to_html(options = {})
-    tag('img', :src => public_filename, :class => css_class_name, :style => 'max-width: 100%') if image?
+    tag('img', :src => public_filename(:display), :class => css_class_name, :style => 'max-width: 100%') if image?
   end
 
   def allow_children?
diff --git a/app/views/content_viewer/slideshow.rhtml b/app/views/content_viewer/slideshow.rhtml
index e1a5c2b..079fbf9 100644
--- a/app/views/content_viewer/slideshow.rhtml
+++ b/app/views/content_viewer/slideshow.rhtml
@@ -2,7 +2,7 @@
 <ul id='slideshow' >
   <% @images.each do |img| -%>
     <% if img.image? -%>
-      <li><%= image_tag(url_for(img.url), :title => (img.abstract.blank? ? img.name : img.abstract)) %></li>
+      <li><%= image_tag(url_for(img.public_filename(:display)), :title => (img.abstract.blank? ? img.name : img.abstract)) %></li>
     <% end -%>
   <% end unless @images.blank? -%>
 </ul>
--
libgit2 0.21.2