vertically center images

src/convertworker.cpp

@@ -120,7 +120,7 @@ void ConvertWorker::convertImage(QNetworkRequest request, QString filename, QTem
     QImage outImage = QImage(Width, Height, inImage.format());
     outImage.fill(Qt::white);
     QPainter painter(&outImage);
-    painter.drawImage(0,0, inImage);
+    painter.drawImage(0, (outImage.height()-inImage.height())/2, inImage);
     painter.end();
 
     QTemporaryFile tmpImage;