File gdk-pixbuf-format.patch of Package imagescan

--- a/gtkmm/preview.cpp
+++ b/gtkmm/preview.cpp
@@ -117,7 +117,7 @@ preview::write (const octet *data, streamsize n)
 void
 preview::boi (const context& ctx)
 {
-  loader_ = Gdk::PixbufLoader::create ();
+  loader_ = Gdk::PixbufLoader::create (ctx.content_type (), true);
   if (!loader_)
     BOOST_THROW_EXCEPTION
       (bad_alloc ());