public static byte[] compress(BufferedImage image, float scale) throws IOException {
	    ByteArrayOutputStream baos = new ByteArrayOutputStream();
	    Iterator<ImageWriter> writers = ImageIO.getImageWritersByFormatName("jpg");
	    ImageWriter writer = writers.next();
	    ImageWriteParam param = writer.getDefaultWriteParam();
	    param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
	    param.setCompressionQuality(scale);
	    ImageOutputStream ios = ImageIO.createImageOutputStream(baos);
	    writer.setOutput(ios);
	    writer.write(null, new IIOImage(image, null, null), param);
	    byte[] data = baos.toByteArray();
	    ios.close();
	    baos.close();
	    writer.dispose();
	    return data;
	}