How do you know how much compression a jpg file is compressed with ?

Hi there !
i d like to know how much compression a jpg file is compressed with ? 0 to 12

i can't open this file JPEGQuality.jsx
the extension file on the topic says .zip
i have got an os 10.10 ???
thanks
2014-11-28 14:46 GMT+01:00 cuisinerouge . <[email protected]>:
Thanks !
i m gonna have a go right now
>
2014-11-28 14:43 GMT+01:00 c.pfaffenbichler <[email protected]>:
how do you know how much compression a jpg file is compressed with ?
>> created by c.pfaffenbichler
>> <https://forums.adobe.com/people/c.pfaffenbichler> in *Photoshop General
>> Discussion* - View the full discussion
>> <https://forums.adobe.com/message/6969227#6969227>
>>

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How do you know how much compression a jpg file is compressed with ?

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