Golang : Grayscale Image

Another feature that I like about this Disintegration Imaging package is the ability to generate grayscaled image. The codes below will demonstrate how to quickly turn an image into grayscale version.

 package main

 import (
 "fmt"
 "github.com/disintegration/imaging"
 "os"
 "runtime"
 )

 func main() {

 // maximize CPU usage for maximum performance
 runtime.GOMAXPROCS(runtime.NumCPU())

 // load original image
 img, err := imaging.Open("./big.jpg")

 if err != nil {
 fmt.Println(err)
 os.Exit(1)
 }

 // grayscale the image
 grayimg := imaging.Grayscale(img)

 // save grayscaled image
 err = imaging.Save(grayimg, "./grayscaled.png")

 if err != nil {
 fmt.Println(err)
 os.Exit(1)
 }

 // everything ok
 fmt.Println("Done")
 }

big.jpg

grayscaled.png

References :

https://www.socketloop.com/tutorials/golang-resize-image

https://github.com/disintegration/imaging