java - How to get an InputStream from a BufferedImage?

Question

How can I get an InputStream from a BufferedImage object? I tried this but ImageIO.createImageInputStream() always returns NULL

BufferedImage bigImage = GraphicsUtilities.createThumbnail(ImageIO.read(file), 300);
ImageInputStream bigInputStream = ImageIO.createImageInputStream(bigImage);

The image thumbnail is being correctly generated since I can paint bigImage to a JPanel with success.

Answer 1

From http://usna86-techbits.blogspot.com/2010/01/inputstream-from-url-bufferedimage.html

It works very fine!

Here is how you can make an InputStream for a BufferedImage:

URL url = new URL("http://www.google.com/intl/en_ALL/images/logo.gif");
BufferedImage image = ImageIO.read(url);
ByteArrayOutputStream os = new ByteArrayOutputStream();
ImageIO.write(image, "gif", os);
InputStream is = new ByteArrayInputStream(os.toByteArray());