fix #208

AUTHORS

@@ -17,4 +17,4 @@ Arthur Titeica <arthur.titeica@gmail.com>
 Deepak Thukral <iapain@iapa.in>
 Jamie Ly <me@jamie.ly>
 Lu Wang <coolwanglu@gmail.com>
-
+Steven Lee <rubypdf@gmail.com>

src/BackgroundRenderer/SplashBackgroundRenderer.cc

@@ -188,10 +188,16 @@ void SplashBackgroundRenderer::dump_image(const char * filename, int x1, int y1,
         p += row_size;
     }
     
-    if(!writer->writePointers(pointers.data(), height)) {
+    if(!writer->writePointers(pointers.data(), height)) 
+    {
         throw "Cannot write background image";
     }
 
+    if(!writer->close())
+    {
+        throw "Cannot finish background image";
+    }
+
     fclose(f);
 }