github.com/daaku/docker@v1.5.0/docs/theme/mkdocs/img/icons/README.md (about)

     1  ### About the images 
     2  
     3  Generally the icons are created in .svg, because it is a nicer format. Then we can easily convert them to .png as required.
     4  
     5  Using imagemagick; mogrify:
     6  
     7  mogrify -background none -format png *.svg