--- libpgf/src/PGFimage.cpp.orig	2012-07-06 13:31:09.305901344 +0200
+++ libpgf/src/PGFimage.cpp	2012-07-06 13:31:48.998084488 +0200
@@ -1114,7 +1114,7 @@
 	}
 
 	// update level lengths
-	nWrittenBytes = m_encoder->UpdateLevelLength(); // return written image bytes 
+	nWrittenBytes += m_encoder->UpdateLevelLength(); // return written image bytes 
 
 	// delete encoder
 	delete m_encoder; m_encoder = NULL;