Mage is a package built on top of image. It provides some filters such as Gaussian Blur and Sobel Operator.
Make sure you have you set your GOPATH (https://github.com/golang/go/wiki/GOPATH). Type the command below to install the package.
$ go get -u github.com/carljoshua/mage
Since I am working on my studies, I'll only update this repo in my free time so your contribution is much appreciated.
To contribute, fork it and create a new branch. If you have a working feature, create a pull request.