Viewing Quality Factor of JPEG in Photoshop

Hi All,
I have a JPEG file which I am opening in Photoshop. I would like to know if there is any option in Photoshop which I can use to find out the quality factor with which this JPEG file has been compressed. I want to see the quality factor of already compressed file. Thanks in advance.
Thanks,
Sham

art by accident wrote:
The compression level sticks as an association. So if you try to resave it you'll see.
Edit: Never mind, I was wrong, it doesn't. (don't know where I heard that).
You weren't wrong.  Photoshop DOES extract and reuse the JPEG quality level you saved an image with previously as the default for the next save, as long as the image was previously saved from Photoshop.
But since JPEG quality isn't really just a simple number under the covers, but a complex combination of several compression factors, it can't always be reduced to a simple "Photoshop equivalent" number, if the image is from a source other than a previous Photoshop save.
During its own saves, Photoshop simplifies the selection of the multiple compression parameters down to a single number between 1 and 10 or 1 and 12 (depending on which save function you use).
The answer to Sham is this:  You can't expect to get a single quality "factor" for all JPEG files from every source.  As an example, the parameters used to compress a JPEG file in your camera may not correspond to any of Photoshop's numeric values.
Paul's script looks like the best answer you're going to get, short of finding a full-on JPEG analysis application somewhere.
-Noel

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