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(original)
Centercrop.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.
Advertisement
Tutorials
+21.2k Golang : Convert(cast) string to rune and back to string example
+9.1k Golang : Inject/embed Javascript before sending out to browser example
+6.5k CodeIgniter : form input set_value cause " to become & quot
+12.9k Golang : Add ASCII art to command line application launching process
+28.7k Golang : Change a file last modified date and time
+33.9k Golang : convert(cast) bytes to string
+34.1k Golang : Proper way to set function argument default value
+17.2k Golang : Fix cannot convert buffer (type *bytes.Buffer) to type string error
+7.8k Golang : Mapping Iban to Dunging alphabets
+32.3k Golang : Validate email address with regular expression
+6k Golang : Generate multiplication table from an integer example