How to download an image using Selenium (any version)?

I prefer doing something like this :

1. Get the SRC attribute of the image.
2. Use ImageIO.read to read the image onto a BufferedImage
3. Save the BufferedImage using ImageIO.write function

For e.g.

String src = imgElement.getAttribute('src');
BufferedImage bufferedImage = ImageIO.read(new URL(src));
File outputfile = new File("saved.png");
ImageIO.write(bufferedImage, "png", outputfile);