diff --git a/src/Imagine/Loader/FileSystemLoader.php b/src/Imagine/Loader/FileSystemLoader.php
index 0aeb13f..0df640b 100644
--- a/src/Imagine/Loader/FileSystemLoader.php
+++ b/src/Imagine/Loader/FileSystemLoader.php
@@ -24,7 +24,7 @@ class FileSystemLoader implements LoaderInterface
     public function __construct(ResolverInterface $resolver)
     {
         $this->resolver = $resolver;
-        $this->loader   = new SimpleFileSystemLoader('');
+        $this->loader   = new SimpleFileSystemLoader(null);
     }
 
     /**
diff --git a/src/Imagine/Loader/SimpleFileSystemLoader.php b/src/Imagine/Loader/SimpleFileSystemLoader.php
index 4ea1e62..07d85f0 100644
--- a/src/Imagine/Loader/SimpleFileSystemLoader.php
+++ b/src/Imagine/Loader/SimpleFileSystemLoader.php
@@ -32,7 +32,11 @@ public function load($path)
             );
         }
 
-        $absolutePath = $this->rootPath . '/' . ltrim($path, '/');
+        if ($this->rootPath === null) {
+            $absolutePath = $path;
+        } else {
+            $absolutePath = $this->rootPath . '/' . ltrim($path, '/');
+        }        
 
         if (!file_exists($absolutePath)) {
             throw new Exception\ImageNotFoundException(sprintf('Source image not found in "%s"', $absolutePath));
diff --git a/src/View/Strategy/ImageStrategy.php b/src/View/Strategy/ImageStrategy.php
index 27915a7..5dc7ce7 100644
--- a/src/View/Strategy/ImageStrategy.php
+++ b/src/View/Strategy/ImageStrategy.php
@@ -90,6 +90,34 @@ public function injectResponse(ViewEvent $e)
 
             $response = $e->getResponse();
             $response->setContent($result);
+
+            $response->getHeaders()->addHeaderLine('Content-type', $this->getMimeType($model->getFormat()));
         }
     }
+
+    /**
+     * Internal
+     *
+     * Get the mime type based on format.
+     *
+     * @param string $format
+     *
+     * @return string mime-type
+     *
+     * @throws RuntimeException
+     */
+    protected function getMimeType($format)
+    {
+        static $mimeTypes = array(
+            'jpeg'  => 'image/jpeg',
+            'jpg'   => 'image/jpeg',
+            'pjpeg' => 'image/jpeg',
+            'gif'   => 'image/gif',
+            'png'   => 'image/png',
+            'wbmp'  => 'image/vnd.wap.wbmp',
+            'xbm'   => 'image/xbm',
+        );
+
+        return $mimeTypes[$format];
+    }
 }