--- signwriter/signwriter.admin.inc.org	2009-07-05 15:44:01.000000000 +0200
+++ signwriter/signwriter.admin.inc	2009-07-05 15:44:03.000000000 +0200
@@ -510,4 +510,5 @@ function signwriter_profile_form(&$form_
     $preview_profile->fontsize = 12;
     $preview_profile->maxwidth = 400;
+    $preview_profile->imagetype = 'gif';
     $rows[] = array(
       'name' => $fontname,