a lot of changes
diff --git a/report_templates/report_hdd.html b/report_templates/report_hdd.html
index 40fadcc..ea04eb5 100644
--- a/report_templates/report_hdd.html
+++ b/report_templates/report_hdd.html
@@ -72,10 +72,10 @@
     </div>
     <div class="row">
         <div class="col-md-6">
-            <img src="charts/rand_read_4k.png"/>
+            <img src="charts/rand_read_4k.{img_ext}"/>
         </div>
         <div class="col-md-6">
-            <img src="charts/rand_write_4k.png"/>
+            <img src="charts/rand_write_4k.{img_ext}"/>
         </div>
     </div>
     <!--div class="row">