Knowing what type of image one is manipulating

Hello,
Suppose I get an inputstream from a web form.
1. How can I check that I have an image and not another type of binary file?
2. How do I know what type of image I have (jpg, or gif)?
Thanks in advance,
Julien.

Hi! I have the same problem! I get a byte array from the database and i know that is an image but i can't get the extension or the mime types. It could be a gif, jpeg or a png. I tried to open the byte array and read the first bytes( for png you get something like �PNG and for gif GIF89) but this didn't work for me.
Thanks in advance,

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