process.go

package main

import (
	"fmt"
	"github.com/disintegration/imaging"
	"image"
	"image/color"
	"strconv"
	"time"
)

type size struct {
	w int
	h int
}

var all []size

func main() {
	start := time.Now()

	all := []size{
		size{
			w: 100,
			h: 100,
		},
		size{
			w: 200,
			h: 200,
		},
		size{
			w: 300,
			h: 300,
		},
		size{
			w: 400,
			h: 400,
		},
		size{
			w: 500,
			h: 500,
		},
	}

	// input file
	file := "img/eg.jpeg"

	img, err := imaging.Open(file)
	if err != nil {
		panic(err)
	}

	// Generate all resized image sizes to output folder
	for _, s := range all {
		r := imaging.Resize(img, s.w, s.h, imaging.Lanczos)
		dst := imaging.New(s.w, s.h, color.NRGBA{0, 0, 0, 0})
		dst = imaging.Paste(dst, r, image.Pt(0, 0))
		err := imaging.Save(dst, "output/dst"+strconv.Itoa(s.w)+strconv.Itoa(s.h)+".jpg")
		if err != nil {
			panic(err)
		}
	}

	elapsed := time.Since(start)

	fmt.Printf("Resize timing millisecond : %s\n", strconv.Itoa(int(elapsed.Nanoseconds()/1000000)))
}