17°

批量图片压缩工具

 针对移动端网络图片加载缓慢,网上又缺少批量压缩图片的工具,于是自己开发了一个,分享出来,希望能给大家带来帮助。

工具:vs2017

创建项目 windowsform  

 

 

文件压缩方法

 /// <summary>
        /// 获取缩略图
        /// </summary>
        /// <param name="bitmap"></param>
        /// <param name="width"></param>
        /// <returns></returns>
        public static Image GetThumbnailImageByte(Image bitmap, int width)
        {
            System.Drawing.Image img = bitmap.Clone() as Image;
        if (bitmap.RawFormat == System.Drawing.Imaging.ImageFormat.Gif)
        {
            #region gif动态图缩放
            //不够100*100的不缩放
            if (img.Width &gt; width)
            {
                System.IO.MemoryStream stream = new System.IO.MemoryStream();
                var height = (img.Height * width) / img.Width;
                //新图第一帧
                Image new_img = new Bitmap(width, height);
                //新图其他帧
                Image new_imgs = new Bitmap(width, height);
                //新图第一帧GDI+绘图对象
                Graphics g_new_img = Graphics.FromImage(new_img);
                //新图其他帧GDI+绘图对象
                Graphics g_new_imgs = Graphics.FromImage(new_imgs);
                //配置新图第一帧GDI+绘图对象
                g_new_img.CompositingMode = CompositingMode.SourceCopy;
                g_new_img.InterpolationMode = InterpolationMode.HighQualityBicubic;
                g_new_img.PixelOffsetMode = PixelOffsetMode.HighQuality;
                g_new_img.SmoothingMode = SmoothingMode.HighQuality;
                g_new_img.Clear(Color.FromKnownColor(KnownColor.Transparent));
                //配置其他帧GDI+绘图对象
                g_new_imgs.CompositingMode = CompositingMode.SourceCopy;
                g_new_imgs.InterpolationMode = InterpolationMode.HighQualityBicubic;
                g_new_imgs.PixelOffsetMode = PixelOffsetMode.HighQuality;
                g_new_imgs.SmoothingMode = SmoothingMode.HighQuality;
                g_new_imgs.Clear(Color.FromKnownColor(KnownColor.Transparent));
                //遍历维数
                foreach (Guid gid in img.FrameDimensionsList)
                {
                    //因为是缩小GIF文件所以这里要设置为Time
                    //如果是TIFF这里要设置为PAGE
                    FrameDimension f = FrameDimension.Time;
                    //获取总帧数
                    int count = img.GetFrameCount(f);
                    //保存标示参数
                    System.Drawing.Imaging.Encoder encoder = System.Drawing.Imaging.Encoder.SaveFlag;
                    //
                    EncoderParameters ep = null;
                    //图片编码、解码器
                    ImageCodecInfo ici = null;
                    //图片编码、解码器集合
                    ImageCodecInfo[] icis = ImageCodecInfo.GetImageDecoders();
                    //为 图片编码、解码器 对象 赋值
                    foreach (ImageCodecInfo ic in icis)
                    {
                        if (ic.FormatID == ImageFormat.Gif.Guid)
                        {
                            ici = ic;
                            break;
                        }
                    }
                    //每一帧
                    for (int c = 0; c &lt; count; c++)
                    {
                        //选择由维度和索引指定的帧
                        img.SelectActiveFrame(f, c);
                        //第一帧
                        if (c == 0)
                        {
                            //将原图第一帧画给新图第一帧
                            g_new_img.DrawImage(img, new Rectangle(0, 0, width, height), new Rectangle(0, 0, img.Width, img.Height), GraphicsUnit.Pixel);
                            //把振频和透明背景调色板等设置复制给新图第一帧
                            for (int i = 0; i &lt; img.PropertyItems.Length; i++)
                            {
                                new_img.SetPropertyItem(img.PropertyItems[i]);
                            }
                            ep = new EncoderParameters(1);
                            //第一帧需要设置为MultiFrame
                            ep.Param[0] = new EncoderParameter(encoder, (long)EncoderValue.MultiFrame);
                            //保存第一帧
                            new_img.Save(stream, ici, ep);
                        }
                        //其他帧
                        else
                        {
                            //把原图的其他帧画给新图的其他帧
                            g_new_imgs.DrawImage(img, new Rectangle(0, 0, width, height), new Rectangle(0, 0, img.Width, img.Height), GraphicsUnit.Pixel);
                            //把振频和透明背景调色板等设置复制给新图第一帧
                            for (int i = 0; i &lt; img.PropertyItems.Length; i++)
                            {
                                new_imgs.SetPropertyItem(img.PropertyItems[i]);
                            }
                            ep = new EncoderParameters(1);
                            //如果是GIF这里设置为FrameDimensionTime
                            //如果为TIFF则设置为FrameDimensionPage
                            ep.Param[0] = new EncoderParameter(encoder, (long)EncoderValue.FrameDimensionTime);
                            //向新图添加一帧
                            new_img.SaveAdd(new_imgs, ep);
                        }
                    }
                    ep = new EncoderParameters(1);
                    //关闭多帧文件流
                    ep.Param[0] = new EncoderParameter(encoder, (long)EncoderValue.Flush);
                    new_img.SaveAdd(ep);
                }
                byte[] byData = new Byte[stream.Length];
                stream.Position = 0;
                stream.Read(byData, 0, byData.Length);
                stream.Close();
                //释放文件
                img.Dispose();
                new_img.Dispose();
                new_imgs.Dispose();
                g_new_img.Dispose();
                g_new_imgs.Dispose();
                return BytesToBitmap(byData);
            }
            #endregion
        }
        else
        {
            #region 静态缩略图
            if (img.Width &gt; width)
            {
                Graphics g = null;
                try
                {
                    var height = (img.Height * width) / img.Width;
                    Bitmap bmpDest = new Bitmap(width, height);
                    g = Graphics.FromImage(bmpDest);
                    //g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.Default;
                    g.Clear(Color.White);
                    g.DrawImage(img, new Rectangle(0, 0, width, height), new Rectangle(0, 0, img.Size.Width, img.Size.Height), GraphicsUnit.Pixel);
                    g.Flush();
                    return bmpDest;
                }
                catch
                {
                    return null;
                }
                finally
                {
                    g.Dispose();
                    img.Dispose();
                }
            }
            #endregion
        }
        return img;
    }

  

工具下载地址:

链接:https://pan.baidu.com/s/19MTOQbssM7Dbzwwc5E1HLw
提取码:xw2x

源码下载地址:

链接:https://pan.baidu.com/s/1Txez9qzBFQXauiAIazlCpw
提取码:gyze

本文转载自博客园,原文链接:https://www.cnblogs.com/xiaodongxiaoji/p/11967440.html

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