Golang : Generate thumbnails from images
After learning how to resize images and crop images with Golang. We will learn how to generate thumbnails from images with this excellent image package https://github.com/disintegration/imaging.
The codes below are taken from the https://github.com/disintegration/imaging itself without modification. Please visit https://github.com/disintegration/imaging to know more how to use the imaging package.
package main
import (
"image"
"image/color"
"runtime"
"github.com/disintegration/imaging"
)
func main() {
// use all CPU cores for maximum performance
runtime.GOMAXPROCS(runtime.NumCPU())
// input files
files := []string{"01.jpg", "02.jpg", "03.jpg"}
// load images and make 100x100 thumbnails of them
var thumbnails []image.Image
for _, file := range files {
img, err := imaging.Open(file)
if err != nil {
panic(err)
}
thumb := imaging.Thumbnail(img, 100, 100, imaging.CatmullRom)
thumbnails = append(thumbnails, thumb)
}
// create a new blank image
dst := imaging.New(100*len(thumbnails), 100, color.NRGBA{0, 0, 0, 0})
// paste thumbnails into the new image side by side
for i, thumb := range thumbnails {
dst = imaging.Paste(dst, thumb, image.Pt(i*100, 0))
}
// save the combined image to file
err := imaging.Save(dst, "dst.jpg")
if err != nil {
panic(err)
}
}
NOTE : The input images varies in sizes and the thumbnails generation function will handle the different sizes.
01.jpg
02.jpg
03.jpg
dst.jpg
See also : Golang : Resize Image
By Adam Ng
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