Identifying the quality factor of JPEG images is very useful for applications in digital image forensics. Though several command-line tools exist and are used in widely used software such as \emph{GIMP} (GNU Image Manipulation Program), 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 of a JPEG image from its quantization tables. The method is presented briefly and a sample program, written in Unix/Linux Shell bash language is provided.
Cite
@article{arxiv.1802.00992,
title = {Determining JPEG Image Standard Quality Factor from the Quantization Tables},
author = {Rémi Cogranne},
journal= {arXiv preprint arXiv:1802.00992},
year = {2018}
}
Comments
6 pages, no figures, 3 tables, associated source code