Imgmin is cli utility to minify and optimize images for the web.

To install this tool you must have go installed. Detailed information about installing go can be found here

Make sure that $GOPATH is set by running go env.

after that run the following command to install the package:

go get -v github.com/thetinygoat/imgmin

add the $GOPATH/bin directory to your $PATH and you are good to go.

To use imgmin simply cd into the folder containing images and run $ imgmin and bam! its done.

the config file can be found in ~/.config/imgmin/config.json.

it is a simple json file and can be edited to specify the quality of compression.

[
    {
        "type": "jpg",
        "compression": 50
    },
    {
        "type": "png",
        "compression": -2
    }
]

"compression": 50 describes by what value the jpeg images are compressed, 50 in this case. it ranges from 0 - 100.

    -2      best speed
    -3      best compression(slower)

values can be set according to needs.