From: qiaohl
Is there any function in PIL to get the value of JPEG quality(1-100)? I know there are functions to set this value, But I found no function to get this value of an existing JPEG file.
You can't get the quality value, because it's not stored anywhere in the file.
I found a Microsoft article at http://support.microsoft.com/kb/324790, titled "Determine the JPEG quality factor by using Visual C# .NET", which states that one could compare the quantization tables against those from the reference code. However, you can't be sure it'll work for all JPEGs.
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