GO语言实现批量压缩图片和水印

        log.Fatal(err)
    }
    defer file_out.Close()
    jpeg.Encode(file_out, canvas, &jpeg.Options{80})
    // cmd_watermark(to, strings.Replace(to, ".jpg", "@big.jpg", 1))
    cmd_thumbnail(to, 480, 360, strings.Replace(to, ".jpg", "@small.jpg", 1))
}
func cmd_thumbnail(file string, width uint, height uint, to string) {
    // 打开图片并解码
    file_origin, _ := os.Open(file)
    origin, _ := jpeg.Decode(file_origin)
    defer file_origin.Close()
    canvas := resize.Thumbnail(width, height, origin, resize.Lanczos3)
    file_out, err := os.Create(to)
    if err != nil {
        log.Fatal(err)
    }
    defer file_out.Close()
    jpeg.Encode(file_out, canvas, &jpeg.Options{80})
}
// 水印
func cmd_watermark(file string, to string) {
    // 打开图片并解码
    file_origin, _ := os.Open(file)
    origin, _ := jpeg.Decode(file_origin)
    defer file_origin.Close()
    // 打开水印图并解码
    file_watermark, _ := os.Open("watermark.png")
    watermark, _ := png.Decode(file_watermark)
    defer file_watermark.Close()
    //原始图界限
    origin_size := origin.Bounds()
    //创建新图层
    canvas := image.NewNRGBA(origin_size)
    // 贴原始图
    draw.Draw(canvas, origin_size, origin, image.ZP, draw.Src)
    // 贴水印图
    draw.Draw(canvas, watermark.Bounds().Add(image.Pt(30, 30)), watermark, image.ZP, draw.Over)
    //生成新图片
    create_image, _ := os.Create(to)
    jpeg.Encode(create_image, canvas, &jpeg.Options{95})
    defer create_image.Close()
}
// 随机生成文件名
func random_name() string {
    rand.Seed(time.Now().UnixNano())
    return strconv.Itoa(rand.Int())
}

以上就是本文所述的全部内容了，希望能够对大家熟练掌握go语言有所帮助。