Histogram showing the relative size distribution of compressed PNG thumbnails
<a href="//commons.wikimedia.org/wiki/User:McZusatz" title="User:McZusatz">McZusatz</a>
<a rel="nofollow" class="external free" href="https://plot.ly/~marco4/8/frequency-vs-fraction-of-original-size/?share_key=pml3644vLOD9ufGTrgsAij">https://plot.ly/~marco4/8/frequency-vs-fraction-of-original-size/?share_key=pml3644vLOD9ufGTrgsAij</a> using 174 ~120px thumbnails from the html code of <a class="external free" href="https://commons.wikimedia.org/w/index.php?title=Category:PNG_files&amp;filefrom=Guns+roses+logo.png#mw-category-media">https://commons.wikimedia.org/w/index.php?title=Category:PNG_files&amp;filefrom=Guns+roses+logo.png#mw-category-media</a> <div class="mw-highlight mw-content-ltr" dir="ltr"><pre>for file in png_src/*;do echo $file;tools/zopfli-master/zopflipng $file out_png/$(basename $file);done</pre></div>