获取图像分辨率（theBufferedImage）

Question

how do I get the resolution of an image.

BufferedImage theBufferedImage = ImageIO.read(new File("/tmp/foo.jpg"));
int width = theBufferedImage.getWidth();
int height = theBufferedImage.getHeight();
int resolution = ???

Regards, saromba

Answer 1

You can't get DPI or any other such information out of BufferedImage , you'll have to examine the original JPEG file for it. It's just a raster image without any metadata. If you're writing a BufferedImage to a file, you can set the DPI. But BufferedImage itself has no concept of DPI, it's just pixels.