gistfile1.go

package main

import (
	"image"
	_ "image/jpeg"
	_ "image/png"
	"log"
	"os"

	"github.com/chai2010/webp"
)

func main() {

	ifile := os.Args[1]
	ofile := os.Args[2]

	f, err := os.Open(ifile)
	defer f.Close()
	if err != nil {
		log.Fatal("error during open: ", err)
	}

	img, _, err := image.Decode(f)
	if err != nil {
		log.Fatal("error decoding file: ", err)
	}

	out, err := os.Create(ofile)
	defer out.Close()
	if err != nil {
		log.Fatal("Unable to create a file: ", err)
	}

	webp.Encode(out, img, &webp.Options{true, 90})
}