qcam: saveImageAs: Set image quality explicitly

The QImageWriter defaults to an image quality value of 75 which can lead
to perceivable visual artefacts.

Improve the quality of the output by explicitly setting the image
quality to 95.

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

src/qcam/main_window.cpp

@@ -360,6 +360,7 @@ void MainWindow::saveImageAs()
 		return;
 
 	QImageWriter writer(filename);
+	writer.setQuality(95);
 	writer.write(image);
 }