* @return base64-encoded version of the image
	 */
	public String getJpegBase64(int quality) {
		Image eImage = getScreenImage();
		ByteArrayOutputStream os = new ByteArrayOutputStream();
		JpegEncoder jc = new JpegEncoder(eImage, quality, os);
		jc.Compress();
		byte[] jpeg = os.toByteArray();
		releaseScreenImage();
		return "" + Base64.getBase64(jpeg);
	}