Exporting a JPanel to an image

So I've been trying to export an image that I've drawn on a JPanel into an image. I've been using this method:

BufferedImage image = new BufferedImage(getWidth(), getHeight(), BufferedImage.TYPE_INT_RGB);
Graphics2D g = image.createGraphics();
paint(g);
try { ImageIO.write(image, "png", new File([location goes here]); } catch (IOException e) {}

I get an image in my intended location but I get a compressed version of what my JPanel shows. The same happens if I try to export a BMP as well. Is there a way to get a pixel-perfect image exported from the JPanel? Thanks in advance.