go-webp

This library requires the Google libwebp C library to be installed on your system. Use the following commands depending on your operating system:

MacOS:

brew install webp

Linux:

sudo apt-get update
sudo apt-get install libwebp-dev

Install the library using go get:

go get -u github.com/kolesa-team/go-webp

Use webp.Decode to convert a WebP file into a standard Go image.Image. You can pass &decoder.Options{} to customize the decoding process.

Example of decoding a WebP file and saving it as a JPEG:

package main

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

	"github.com/kolesa-team/go-webp/decoder"
	"github.com/kolesa-team/go-webp/webp"
)

func main() {
	file, err := os.Open("test_data/images/m4_q75.webp")
	if err != nil {
		log.Fatalln(err)
	}

	output, err := os.Create("example/output_decode.jpg")
	if err != nil {
		log.Fatal(err)
	}
	defer output.Close()

	img, err := webp.Decode(file, &decoder.Options{})
	if err != nil {
		log.Fatalln(err)
	}

	if err = jpeg.Encode(output, img, &jpeg.Options{Quality:75}); err != nil {
		log.Fatalln(err)
	}
}

Use webp.Encode to convert a Go image.Image into a WebP file. You must provide encoder options, which can be created using encoder.NewLossyEncoderOptions or encoder.NewLosslessEncoderOptions.

Example of encoding a JPEG image into a lossy WebP file:

package main

import (
	"github.com/kolesa-team/go-webp/encoder"
	"github.com/kolesa-team/go-webp/webp"
	"image/jpeg"
	"log"
	"os"
)

func main() {
	file, err := os.Open("test_data/images/source.jpg")
	if err != nil {
		log.Fatalln(err)
	}

	img, err := jpeg.Decode(file)
	if err != nil {
		log.Fatalln(err)
	}

	output, err := os.Create("example/output_decode.webp")
	if err != nil {
		log.Fatal(err)
	}
	defer output.Close()

	options, err := encoder.NewLossyEncoderOptions(encoder.PresetDefault, 75)
	if err != nil {
		log.Fatalln(err)
	}

	if err := webp.Encode(output, img, options); err != nil {
		log.Fatalln(err)
	}
}