diff --git a/Gruntfile.js b/Gruntfile.js
index aad8eba4..5be36f82 100644
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -29,7 +29,10 @@ module.exports = function(grunt){
         
         // clean everything
         clean: {
-            build: ['<%= config.site %>']
+            build: [
+                '<%= config.site %>/*', 
+                '!<%= config.site %>/media'
+            ]
         },
 
         // Jekyll
@@ -41,6 +44,7 @@ module.exports = function(grunt){
                 // options: {
 //                     lsi: true
 //                 }
+                src: '<%= config.src %>/'
 			},
             serve: {
                 src: '<%= config.src %>/'
@@ -124,11 +128,10 @@ module.exports = function(grunt){
                         expand: true,
                         cwd: '<%= config.site %>/',
                         src: ['*.png'],
-                        dest: '<%= config.site %>/',
-                        ext: '.png'
+                        dest: '<%= config.site %>/'
                     }
                 ]
-            },
+            }
         },
         
         // dev server
@@ -234,7 +237,7 @@ module.exports = function(grunt){
         'clean',
         'rsync:copy_media',
         'jekyll:production',
-        'imagemin',
+        //'imagemin',
         'less',
         'cmq',
         'cssmin',
diff --git a/_config.yml b/_config.yml
index 05c40fa6..af9ac4ca 100644
--- a/_config.yml
+++ b/_config.yml
@@ -42,7 +42,7 @@ picture:
   markup: "picturefill"
   presets:
     default:
-      ppi: [1, 1.5]
+      ppi: [1, 1.5, 2]
       attr:
         itemprop: "image"
       source_medium:
@@ -54,7 +54,7 @@ picture:
       source_default: 
         width: "320"
     featured:
-      ppi: [1, 1.5]
+      ppi: [1, 1.5, 2]
       attr:
         class: "featured-image"
         itemprop: "image"