Golang : Crop image




This is a continuation from the previous tutorial on how to resize image in Golang. For this tutorial, we will learn how easy it is to crop image with the excellent https://github.com/disintegration/imaging package.

This code below will create two images. One which is cropped from center point and another cropped according to the defined rectangular region.

 package main

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

 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)
 }

 // crop from center
 centercropimg := imaging.CropCenter(img, 300, 300)

 // save cropped image
 err = imaging.Save(centercropimg, "./centercrop.jpg")

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

 // crop out a rectangular region
 rectcropimg := imaging.Crop(img, image.Rect(0, 0, 500, 500))

 // save cropped image
 err = imaging.Save(rectcropimg, "./rectcrop.jpg")

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

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

 }

Big.jpg Big.jpg(original)

centercrop.jpg Centercrop.jpg

rectcrop.jpg Rectcrop.jpg

For more information and other functions to manipulate images, please see http://godoc.org/github.com/disintegration/imaging

  See also : Golang : Resize Image





By Adam Ng

IF you gain some knowledge or the information here solved your programming problem. Please consider donating to the less fortunate or some charities that you like. Apart from donation, planting trees, volunteering or reducing your carbon footprint will be great too.


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