缩小图像尺寸C＃

我的情景：

我希望减少图像大小（10 KB到3 KB）

Answer 1

那么，你想要的是这样的：

// Make sure to include this at the top using System.Drawing.Imaging; 

 /// 
 /// Saves an image as a jpeg image, with the given quality /// 
 ///  Path to which the image would be saved.  ///  An integer from 0 to 100, with 100 being the highest quality.  public static void SaveJpeg (string path, Image img, int quality) { if (quality<0 || quality>100) throw new ArgumentOutOfRangeException("quality must be between 0 and 100."); // Encoder parameter for image quality EncoderParameter qualityParam = new EncoderParameter(Encoder.Quality, quality); // JPEG image codec ImageCodecInfo jpegCodec = GetEncoderInfo("image/jpeg"); EncoderParameters encoderParams = new EncoderParameters(1); encoderParams.Param[0] = qualityParam; img.Save(path, jpegCodec, encoderParams); } /// 
 /// Returns the image codec with the given mime type /// 
 private static ImageCodecInfo GetEncoderInfo(string mimeType) { // Get image codecs for all image formats ImageCodecInfo[] codecs = ImageCodecInfo.GetImageEncoders(); // Find the correct image codec for(int i=0; i 

然后你可以这样做：

 // First load the image somehow Image myImage = Image.FromFile(pathToImage, true); // Save the image with a quality of 50% SaveJpeg (destImagePath, myImage, 50); 

请参阅VB论坛和此博客文章中的这篇文章 。

Answer 2

使用GDI

请看这个样本。 使用GDI +调整照片大小。 希望它可以帮助你。

Answer 3

好吧，图像不能神奇地变小，所以你要么必须压缩它，要么缩小它。