forked from nfnt/resize
/
main.go
71 lines (55 loc) · 1.56 KB
/
main.go
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package main
import (
"bytes"
"fmt"
"image"
"image/jpeg"
"image/png"
"io/ioutil"
"log"
"os"
"github.com/giant-stone/goimg"
)
func main() {
exampleResizePNG()
exampleResizeJPG()
}
func exampleResizeJPG() {
// fetch sample image form https://en.wikipedia.org/wiki/Lenna
fn := "Lena.jpg"
dat, err := ioutil.ReadFile(fn)
exitOnErr(err)
img, format, err := image.Decode(bytes.NewReader(dat))
exitOnErr(err)
widthOrigin, heightOrigin := img.Bounds().Max.X, img.Bounds().Max.Y
width, height := uint(widthOrigin/2), uint(heightOrigin/2)
imgResized := goimg.Resize(width, height, img, goimg.Lanczos3)
output, err := os.Create("small.jpg")
exitOnErr(err)
defer output.Close()
err = jpeg.Encode(output, imgResized, nil)
exitOnErr(err)
fmt.Printf("resize format=%s (%d,%d)=>(%d,%d) \n", format, widthOrigin, heightOrigin, width, height)
}
func exampleResizePNG() {
// fetch sample image form https://en.wikipedia.org/wiki/Lenna
fn := "Lena.png"
dat, err := ioutil.ReadFile(fn)
exitOnErr(err)
img, format, err := image.Decode(bytes.NewReader(dat))
exitOnErr(err)
widthOrigin, heightOrigin := img.Bounds().Max.X, img.Bounds().Max.Y
width, height := uint(widthOrigin/2), uint(heightOrigin/2)
imgResized := goimg.Resize(width, height, img, goimg.Lanczos3)
output, err := os.Create("small.png")
exitOnErr(err)
defer output.Close()
err = png.Encode(output, imgResized)
exitOnErr(err)
fmt.Printf("resize format=%s (%d,%d)=>(%d,%d) \n", format, widthOrigin, heightOrigin, width, height)
}
func exitOnErr(err error) {
if err != nil {
log.Panic(err)
}
}