$ go get github.com/mattn/go-sixel
You can install gosr (go sixel renderer), gosd (go sixel decoder) with following installation instruction.
$ go get github.com/mattn/go-sixel/cmd/gosr
$ go get github.com/mattn/go-sixel/cmd/gosd
Encode
$ cat foo.png | gosr -
Decode
$ cat foo.drcs | gosd > foo.png
Use as library
img, _, _ := image.Decode(filename)
sixel.NewEncoder(os.Stdout).Encode(img)MIT
Yasuhiro Matsumoto (a.k.a mattn)