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Given some source file (or more generic - input stream), I need to find out
I looked at the API, but it is not clear how to get the type of image or Exif data.
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The exchangeable image file format (EXIF) is a standard for embedding technical metadata in image files that many camera manufacturers use and many image-processing programs support. EXIF metadata can be embedded in TIFF and JPEG images.
On a Windows PC using File Explorer right-click on the file you want to see the data for. You will see a window pop up with various options. Click on Properties and then on Details. This will bring up the EXIF data for that photo.
Just use the read method of the Java ImageIO class, and you can open/read images in a variety of formats (GIF, JPG, PNG) in basically one line of Java code.
All you have to right-click on the preferred image in Windows File Explorer and select the Properties option. In the properties dialogue box, click on the Details tab. After that, you will view EXIF data information like size, resolution, and other additional details of the image.
Last time I had to do this, a couple of years ago, the standard API couldn't read EXIF data. This library can do so though:
http://www.drewnoakes.com/code/exif/
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Easy answer: Use https://github.com/drewnoakes/metadata-extractor/
If you're crazy/brave/curious, you could get image type from the stream by reading the first few bytes (these are magic numbers). I believe the exif is generally at the start of the stream too.
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