Golang 图片缩略

Golang 图片缩略

图片裁剪

func ImageResize() {file, err := os.Open("test-1.png")if err != nil {log.Fatal(err)}// decode jpeg into image.Imageimg, _, err := image.Decode(file)if err != nil {log.Fatal(err)}file.Close()// resize to width 1000 using Lanczos resampling// and preserve aspect ratiokuan := img.Bounds().Dx() //gao := img.Bounds().Dy()  //fmt.Println(kuan)fmt.Println(gao)m := resize.Resize(200, 0, img, resize.Lanczos3)//m := resize.Resize(1000, 0, img, resize.Lanczos3)out, err := os.Create("output-1.jpg")if err != nil {log.Fatal(err)}defer out.Close()// write new image to filejpeg.Encode(out, m, nil)fmt.Println("------------------")
}

[]byte 缩略

func ImageResize(ctx *gin.Context, imgByte []byte, percent uint, weight, height int) (b []byte, err error) {img, _, err := image.Decode(bytes.NewReader(imgByte))if err != nil {return}w := uint(weight) * percenth := uint(height) * percentresized := resize.Resize(w, h, img, resize.Lanczos3)buf := new(bytes.Buffer)if err = jpeg.Encode(buf, resized, nil); err != nil {return}return buf.Bytes(), nil
}