C＃生成縮略圖文件大小

-1

我有以下代碼來拍攝圖像並生成縮略圖。C＃生成縮略圖文件大小

如何改變質量或壓縮以編程方式獲得較小的文件大小？

Image thumbNail = image.GetThumbnailImage(Width, Height, null, new IntPtr());

來源

2009-09-07 leora

-1再次問同樣的問題：http://stackoverflow.com/questions/684092/create-thumbnail-and-reduce-image-size –

究竟你是否經常要問同樣的問題？：http://stackoverflow.com/questions/672807/generating-jpg-thumbnails-in-dotnet –

如果你真的需要在製作縮略圖更好的控制，你會好起來的生產自己手動生成更小尺寸和不同質量的圖像。 GetThumbnailImage不會給你太多的控制。

看到這篇文章是如何完成的。 http://www.switchonthecode.com/tutorials/csharp-tutorial-image-editing-saving-cropping-and-resizing

來源

2009-09-07 01:26:09 David

在保存thumbNail與Image.Save你可以通過一個EncoderParameter指定的質量。請參閱：Reducing JPEG Picture Quality using C#

EncoderParameter epQuality = new EncoderParameter(
    System.Drawing.Imaging.Encoder.Quality, 
    (int)numQual.Value); 

... 
newImage.Save(..., iciJpegCodec, epParameters);

來源

2009-09-07 01:25:37 dtb

您不使用GetThumbnailImage API：

protected Stream ResizeImage(string source, int width, int height) { 
      using (System.Drawing.Bitmap bmp = (System.Drawing.Bitmap)System.Drawing.Bitmap.FromFile(source)) 
      using (System.Drawing.Bitmap newBmp = new System.Drawing.Bitmap(width, height)) 
      using (System.Drawing.Graphics graphic = System.Drawing.Graphics.FromImage(newBmp)) 
      { 

       graphic.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic; 
       graphic.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; 
       graphic.PixelOffsetMode = System.Drawing.Drawing2D.PixelOffsetMode.HighQuality; 
       graphic.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality; 

       graphic.DrawImage(bmp, 0, 0, width, height); 

       MemoryStream ms = new MemoryStream(); 
       newBmp.Save(ms, System.Drawing.Imaging.ImageFormat.Png); 
       return ms; 

      }    
     }

來源

2009-09-07 01:25:42

C＃生成縮略圖文件大小

回答

相關問題