@Doitsu
I don't know if this answers your question. It's cryptic for me
Code:
[roger@anterg ~]$ jpegtran -v
libjpeg-turbo version 1.4.2 (build 20151205)
Copyright (C) 1991-2012 Thomas G. Lane, Guido Vollbeding
Copyright (C) 1999-2006 MIYASAKA Masaru
Copyright (C) 2009 Pierre Ossman for Cendio AB
Copyright (C) 2009-2015 D. R. Commander
Copyright (C) 2009-2011 Nokia Corporation and/or its subsidiary(-ies)
Copyright (C) 2013-2014 MIPS Technologies, Inc.
Copyright (C) 2013 Linaro Limited
Emulating The Independent JPEG Group's software, version 8d 15-Jan-2012
Code:
[roger@anterg ~]$ locate jpegtran
/home/roger/.local/share/sigil-ebook/sigil/plugins/ImageOptimizer/osx/jpegtran
/home/roger/.local/share/sigil-ebook/sigil/plugins/ImageOptimizer/win/jpegtran.exe
/home/roger/.local/share/sigil-ebook/sigil/plugins/ePUBOptimizer/osx/jpegtran
/home/roger/.local/share/sigil-ebook/sigil/plugins/ePUBOptimizer/win/jpegtran.exe
/opt/calibre/bin/jpegtran
/usr/bin/jpegtran
/usr/share/man/man1/jpegtran.1.gz
[roger@anterg ~]$
I noted that the jpegtran in /usr has a 31k size, while the same in /opt has a 493k size. Should I exchange one for another?