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Identifying the quality factor of JPEG images is very useful for applicationsin digital image forensics. Though several command-line tools exist and areused in widely used software such as \emph{GIMP} (GNU Image ManipulationProgram), the well-known image editing software, or the \emph{ImageMagick}suite, we have found that those may provide inaccurate or even wrong results.This paper presents a simple method for determining the exact quality factor ofa JPEG image from its quantization tables. The method is presented briefly anda sample program, written in Unix/Linux Shell bash language is provided.

Determining JPEG Image Standard Quality Factor from the Quantization Tables