OptiPNG

OptiPNG is not a glue requirement but is hardly recommended to optimize the output PNG files to make them as small as possible. OptiPNG is a PNG optimizer that recompresses image files to a smaller size, without losing any information.

OSX

You can install optipng form source or using Homebrew:

$ brew install optipng

Debian/Ubuntu

You can install optipng form source or using apt:

$ apt-get install optipng

Windows

OptiPNG distributes an executable version for Windows, so you can download it from the optipng sourceforge page.

Note

For some reason you may need to use --optipngpath=<OPTIPNG_PATH> in order to make glue work with optipng on Windows. More info.

From source

To install optipng from source, download the last available version and then you can install it doing:

$ tar zvxf optipng-0.6.5.tar.gz
$ cd optipng-0.6.5
$ ./configure
$ make
$ sudo make install

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