高强度不失真在线压缩图片（jpg与png）

结合第三方类库，高强度不失真在线压缩图片，压缩Jpg与Png格式图片。

在线图片压缩，压缩Jpg与Png格式图片。

压缩PNG可使用类库：PNGCompressor

压缩jpg可使用类库：TJCompressor

 

以下为封装后的部分代码片段。

 

点我在线体验

 

 [HttpPost]  public ApiResult ImageCompress(GeneralImageCompressViewModel vm)  {   if (!ModelState.IsValid) { return this.ModelErrorTextResult(); }   int quality = 80;   if (vm.QualityType == 1) { quality = 80; }   else if (vm.QualityType == 2) { quality = 60; }   else if (vm.QualityType == 3) { quality = 40; }   else if (vm.QualityType == 4) { quality = 20; }   string fileName = Path.GetFileNameWithoutExtension(vm.ImageUrl);   string targetUrl = vm.ImageUrl.Replace(fileName, $"{fileName}_compress_{quality}");   string extName = Path.GetExtension(vm.ImageUrl).Replace(".", "").ToLower();   string sourceFullName = UrlOper.MapPath(vm.ImageUrl);   string targetFullName = UrlOper.MapPath(targetUrl);   bool isSuccess = true;   Size newSize = new Size();   try   {    using (Image img = Image.FromFile(sourceFullName))    {     newSize = Commons.EqualRatioSize(img.Width, img.Height, vm.ImgWidth, vm.ImgHeight);     using (var bmp = new Bitmap(img, newSize.Width, newSize.Height))     {      //压缩PNG      if (extName == "png")      {       string tmpImg = UrlOper.MapPath(vm.ImageUrl.Replace(fileName, $"{fileName}_pngsitesize_{newSize.Width}_{newSize.Height}"));       bmp.Save(tmpImg);       bmp.Dispose();       var pngCompressor = new PNGCompression.PNGCompressor       {        PNGToolPath = UrlOper.MapPath("~/content/tools/pngquant"),        PNGExeName = "pngquant.exe"       };       pngCompressor.CompressImageLossy(tmpImg, targetFullName, new PNGCompression.LossyInputSettings       {        MinQuality = 0,        MaxQuality = (quality + 20)       });       System.IO.File.Delete(tmpImg);      }      //压缩JPG      else if (extName == "jpg" || extName == "jpeg")      {       var jpgCompressor = new MozJpegSharp.TJCompressor();       var compressed = jpgCompressor.Compress(bmp, MozJpegSharp.TJSubsamplingOption.Chrominance420, quality, MozJpegSharp.TJFlags.None);       System.IO.File.WriteAllBytes(targetFullName, compressed);      }     }    }    if (!System.IO.File.Exists(targetFullName))    {     isSuccess = false;    }   }   catch   {    isSuccess = false;   }   if (!isSuccess)   {    return this.Ok(new    {     IsCompressOK = false    });   }   long sourceLength = new System.IO.FileInfo(sourceFullName).Length;   long targetLength = new System.IO.FileInfo(targetFullName).Length;   //如果压缩后更大，则返回原图   if (targetLength > sourceLength)   {    targetLength = sourceLength;    targetUrl = vm.ImageUrl;   }   var compressRatio = 100 - (int)(((decimal)targetLength / (decimal)sourceLength) * 100m);   if (compressRatio == 100) { compressRatio = 99; }   string sourceSizeDesc = FileHelper.GetFileSizeDesc(sourceLength);   string targetSizeDesc = FileHelper.GetFileSizeDesc(targetLength);   object result = new   {    Source = UrlOper.ResolveClientUrl(vm.ImageUrl),    Target = targetUrl,    IsCompressOK = true,    ImgWidth = newSize.Width,    ImgHeight = newSize.Height,    SourceSizeDesc = sourceSizeDesc,    TargetSizeDesc = targetSizeDesc,    CompressRatio = compressRatio   };   return this.Ok(result);  }

 

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结合第三方类库，高强度不失真在线压缩图片，压缩Jpg与Png格式图片。在线图片压缩，压缩Jpg与Png格式图片。压缩PNG可使用类库：PNGCompressor压缩jpg可使用类库：TJCompressor以下为封装后的部分代码片段。点我在线体验[HttpPost]publicApiResultImageCompress(GeneralImageCompressViewModelvm){if(!M
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