Generating thumbnails for webp file format

[jack1234 (jack)]

The following code is to create a thumbnail using github.com/disintegration/imaging package
works well for typical image format like jpeg, but it does not work well for webp file format.

I got errorimaging: unsupported image format with the code below.

Is there a more robust way to generate thumbnails for typical image types (jpg, gif, tiff, bmp, etc.) and webp?

package main

import (
	"bytes"
	"fmt"
	"github.com/disintegration/imaging"
	"github.com/chai2010/webp"
	"io/ioutil"
)

//https://stackoverflow.com/questions/8340751/webp-encoder-decoder-in-go
func main() {
	//img, _ := imaging.Open("ml/input/apple.jpg")

	// Load webp
	data, _ := ioutil.ReadFile("ml/input/waterski2.webp")
	// Decode webp
	img, _ := webp.Decode(bytes.NewReader(data))
	//Create thumbnail
	dstImage := imaging.Thumbnail(img, 400, 400, imaging.Lanczos)

	err1:=imaging.Save(dstImage, "ml/output/waterski2.webp")
	if err1!=nil{
		fmt.Println(err1)
	}
}

[Hultan (Per Hultqvist)]

As far as I understand the WEBP format is not supported in Go yet. I ended up making calls to an external program dwebp (linux) to convert from WEBP to JPG or PNG. It can probably be used in the other direction too. I am confident that a similar program exists on Windows or Mac.

[jarrodhroberson (Jarrod Roberson)]

What about this?

https://pkg.go.dev/golang.org/x/image/webp

If decoding is available, encoding should not be impossible.

[Hultan (Per Hultqvist)]

Yeah, you might be correct. I don’t know enough about encoding/decoding image formats, to say whether or not this package is usable for conversion.

In my defense though, it looks like that is version 0.0.0, published a week or so ago, so I was not aware of it

I will definitely look into it for my project, whenever I have time. If it helps the @jack1234 or not, I don’t know.