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diff --git a/_assets/images/pages/sale/DSCF1694.jpg b/_assets_source/images/pages/sale/DSCF1694.jpg
similarity index 100%
rename from _assets/images/pages/sale/DSCF1694.jpg
rename to _assets_source/images/pages/sale/DSCF1694.jpg
diff --git a/_config.yml b/_config.yml
index 664123b..76bb288 100644
--- a/_config.yml
+++ b/_config.yml
@@ -30,16 +30,23 @@ assets:
   css_compressor: sass
 
 picture:
-  source: "_assets/images"
-  output: "pictures"
+  source: "_assets_source/images"
+  output: "assets"
   markup: "picture"
   presets:
-    default:
+    full-width:
       ppi: [1, 2]
       attr:
         itemprop: "image"
-      source_default:
+      source_large:
+        media: "(min-width: 769px)"
         width: "800"
+      source_medium:
+        media: "(min-width: 480px)"
+        width: "640"
+      source_default:
+        width: "400"
+
 
 kramdown:
   input: GFM
diff --git a/sale/index.markdown b/sale/index.markdown
index 64a5f3f..c200e8d 100644
--- a/sale/index.markdown
+++ b/sale/index.markdown
@@ -7,7 +7,7 @@ footer: true
 
 ### iPad 3rd generation - 64GB Wi-Fi & 3G (black) -- £275
 
-{% picture default pages/sale/DSCF1694.jpg %}
+{% picture full-width pages/sale/DSCF1694.jpg %}
 
 For sale is my 3rd gen iPad with Retina display. It has 64Gb of storage and 3G connectivity. It's in excellent condition with no scratches or dents and comes with the original box and accessories. I'm also throwing in the iPad smart case in grey.