private void saveFile() {
		if (currentFile == null) {
			saveAsFile();	//no file info, prompt user to "save as"
			return;
		}
		try {
			ImageIO.write(MainImagePanel.getInstance().getCombined(), "png", currentFile);	//save current file
		} catch (IOException e) {
			System.out.println("Error saving.");
		}
		
	}