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By a statistical analysis over the quantization table stored in a jpeg one could probably deduce the quality which the picture was saved (i.e. this particular save), but it in no way says anything about the picture quality itself (i.e. whether it has ever been saved at lower quality before since its creation). For example, one might have saved a jpeg picture at low quality, and later saved at a higher quality, yet the information lost during the first save can't be restored.
See file INSTALL for installation instructions. See the manpage, judge.1 (or judge.txt), in this directory, for information on what this program does. Parts of this program use source from the IJG JPEG library, read README-jpeg6a for copyright details and more information. It also uses libjpeg, so you have to install it first.
The Independent JPEG Group's JPEG software ========================================== README for release 6a of 7-Feb-96 ================================= This distribution contains the sixth public release of the Independent JPEG Group's free JPEG software. You are welcome to redistribute this software and to use it for any purpose, subject to the conditions under LEGAL ISSUES, below. Serious more»
0.0.0 Sat Feb 6 15:55:23 CET 1998 initial revision. does not always give wrong results ;) 0.0.1 Sat Feb 7 18:55:14 CET 1998 added -b, -v switches, manpage 0.0.2 Code cleanup
JPEGJUDGE(1) JPEGJUDGE(1) NAME jpegjudge - gues more»
jpegjudge (0.0.2-1) unstable; urgency=low * Initial release (Closes: #572608). -- Jari Aalto <j more»
Format-Specification: http://svn.debian.org/wsvn/dep/web/deps/dep5.mdwn?op=file&rev=135 X-Format-Spe more»