optimizegraphics --version (return code: 0)
Please install pngout to increase PNG compression.
OptiPNG version 0.7.6
Copyright (C) 2001-2016 Cosmin Truta and the Contributing Authors.
This program is open-source software. See LICENSE for more details.
Portions of this software are based in part on the work of:
Jean-loup Gailly and Mark Adler (zlib)
Glenn Randers-Pehrson and the PNG Development Group (libpng)
Miyasaka Masaru (BMP support)
David Koblas (GIF support)
Using libpng version 1.6.32 and zlib version 1.2.11
advancecomp vnone by Andrea Mazzoleni, http://www.advancemame.it
optimizegraphics --help (return code: 0)
Usage: optimizegraphics [FILE]
If [FILE] is not defined, it optimizes all files (PNG,MNG,SVGZ) recursively starting at the current working directory.
To achieve the best optimization please use all supported tools (optipng,advdef,pngout).