将图像文件大小减小到150 KB [英] Reduce Image File Size to 150 KB

问题描述

嗨朋友



我正在开发一个图像调整大小项目

我的客户希望图像大小应该是240 * 320和大小应该是50-150 kb



但尺寸不受控制尺寸超过150 kb，图像超过1 MB



我的代码是：

  protected   void  uploadButton_Click（ object  sender，EventArgs e）
 {
 
 Bitmap bmp1 =  new 位图（fileUpload.FileContent）; 
 ImageCodecInfo jgpEncoder = GetEncoder（ImageFormat.Jpeg）; 
 
  //  根据GUID创建一个编码器对象 
质量参数类别的 //  。 
 System.Drawing.Imaging.Encoder myEncoder = 
 System.Drawing.Imaging.Encoder.Quality; 
 
  //  创建一个EncoderParameters对象。  
  //   EncoderParameters对象有一个EncoderParameter数组 
  //  对象。在这种情况下，数组中只有一个 
  //   EncoderParameter对象。 
 EncoderParameters myEncoderParameters =  new  EncoderParameters（ 1 ）; 
 
  //   EncoderParameter myEncoderParameter = new EncoderParameter（myEncoder，50L）;  
  //   myEncoderParameters.Param [0] = myEncoderParameter;  
  //   bmp1.Save（@c：\ TestPhotoQualityFifty.jpg，jgpEncoder，myEncoderParameters）;  
 
  //   myEncoderParameter = new EncoderParameter（myEncoder，100L）;  
  //   myEncoderParameters.Param [0] = myEncoderParameter;  
  //   bmp1.Save（@c：\ TestPhotoQualityHundred.jpg，jgpEncoder，myEncoderParameters）;  
 
 < span class =code-comment> //   Sav将位图作为JPG文件，质量级压缩为零。 
 EncoderParameter myEncoderParameter =  new  EncoderParameter（myEncoder，25L）; 
 myEncoderParameters.Param [ 0 ] = myEncoderParameter; 
 bmp1.Save（ @  c：\ TestPhotoQualityZero.jpg，jgpEncoder，myEncoderParameters ）; 
 
 
 
  if （fileUpload.HasFile）
 {
  //  查找fileUpload控件 
  string  filename = fileUpload.FileName; 
 
  //  检查我们希望上传图像的目录是否确实存在 
  if （！Directory.Exists（MapPath（ @  Uploaded-Files）））
 {
  //  如果没有，那么我们只是在继续之前创建它 
 Directory.CreateDirectory（MapPath（ @ 上传的档案 ））; 
} 
 
  //  指定上传目录 
  string  directory = Server.MapPath（ @ 已上传 - Files\）; 
 
  //  在内存中创建fileUpload控件内容的位图 
 Bitmap originalBMP =  new 位图（ @  C：\TestPhotoQualityZero.jpg）; 
 
  //  计算新图片尺寸 
  int  origWidth = originalBMP.Width; 
  int  origHeight = originalBMP.Height; 
  int  sngRatio = origWidth / origHeight; 
  int  newWidth =  240 ; 
  //   int newHeight = newWidth / sngRatio;  
  int  newHeight =  320 ; 
 
  //  创建一个新的位图，该位图将保存先前调整大小的位图 
位图newBMP = 新位图（originalBMP，newWidth，newHeight）; 
  //  基于新位图创建图形 
图形oGraphics = Graphics .FromImage（newBMP）; 
 
  //  设置新图形文件的属性 
 oGraphics.SmoothingMode = SmoothingMode.AntiAlias; oGraphics.InterpolationMode = InterpolationMode.HighQualityBicubic; 
  //  根据调整后的位图绘制新图形 
 oGraphics.DrawImage （originalBMP， 0 ， 0 ，newWidth，newHeight）; 
 
 
  //  将新图形文件保存到服务器 
 newBMP.Save（目录+   tn _ + filename）; 
 
  //  完成位图对象后，我们将其解除分配。 
 originalBMP.Dispose（）; 
 newBMP.Dispose（）; 
 oGraphics.Dispose（）; 
 
  //  写一条消息告知用户一切正常 
 label.Text =  文件名：颜色：红色 > + filename +   的<峰; br> 中; 
 label.Text + =  内容类型：颜色：红色< span class =code-string> > + fileUpload.PostedFile.ContentType +   < br>; 
 label.Text + =  文件大小：颜色：红色< span class =code-string> > + fileUpload.PostedFile.ContentLength.ToString（）+   ; 
  //  向用户显示图像 
 Image1.Visible = 真; 
 Image1.ImageUrl =  @  / Uploaded-Files / tn _ + filename; 
} 
  else  
 {
 label.Text =  没有上传文件！; 
} 
} 
 
 私人 ImageCodecInfo GetEncoder（ImageFormat格式）
 {
 
 ImageCodecInfo [] codecs = ImageCodecInfo.GetImageDecoders（）; 
 
  foreach （ImageCodecInfo codec  in  codecs）
 {
  if （codec.FormatID == format.Guid）
 {
  return 编解码器; 
} 
} 
 返回  null ; 
} 

解决方案

请使用 SearchBox [ ^ ]（73页！）。

Hi friends

I am developing a Image resize project
my client wants the image size should be in 240*320 and size should be 50-150 kb

but the size is not in control the size exist more than 150 kb for the image more than 1 MB

my code is:

protected void uploadButton_Click(object sender, EventArgs e)
    {
       
        Bitmap bmp1 = new Bitmap(fileUpload.FileContent);
        ImageCodecInfo jgpEncoder = GetEncoder(ImageFormat.Jpeg);

        // Create an Encoder object based on the GUID 
        // for the Quality parameter category.
        System.Drawing.Imaging.Encoder myEncoder =
            System.Drawing.Imaging.Encoder.Quality;

        // Create an EncoderParameters object. 
        // An EncoderParameters object has an array of EncoderParameter 
        // objects. In this case, there is only one 
        // EncoderParameter object in the array.
        EncoderParameters myEncoderParameters = new EncoderParameters(1);

        //EncoderParameter myEncoderParameter = new EncoderParameter(myEncoder, 50L);
        //myEncoderParameters.Param[0] = myEncoderParameter;
        //bmp1.Save(@"c:\TestPhotoQualityFifty.jpg", jgpEncoder, myEncoderParameters);

        //myEncoderParameter = new EncoderParameter(myEncoder, 100L);
        //myEncoderParameters.Param[0] = myEncoderParameter;
        //bmp1.Save(@"c:\TestPhotoQualityHundred.jpg", jgpEncoder, myEncoderParameters);

        // Save the bitmap as a JPG file with zero quality level compression.
        EncoderParameter myEncoderParameter = new EncoderParameter(myEncoder, 25L);
        myEncoderParameters.Param[0] = myEncoderParameter;
        bmp1.Save(@"c:\TestPhotoQualityZero.jpg", jgpEncoder, myEncoderParameters);



        if (fileUpload.HasFile)
        {
            // Find the fileUpload control
            string filename = fileUpload.FileName;

            // Check if the directory we want the image uploaded to actually exists or not
            if (!Directory.Exists(MapPath(@"Uploaded-Files")))
            {
                // If it doesn't then we just create it before going any further
                Directory.CreateDirectory(MapPath(@"Uploaded-Files"));
            }

            // Specify the upload directory
            string directory = Server.MapPath(@"Uploaded-Files\");

            // Create a bitmap of the content of the fileUpload control in memory
            Bitmap originalBMP = new Bitmap(@"c:\TestPhotoQualityZero.jpg");

            // Calculate the new image dimensions
            int origWidth = originalBMP.Width;
            int origHeight = originalBMP.Height;
            int sngRatio = origWidth / origHeight;
            int newWidth = 240;
            //int newHeight = newWidth / sngRatio;
            int newHeight = 320;

            // Create a new bitmap which will hold the previous resized bitmap
            Bitmap newBMP = new Bitmap(originalBMP, newWidth, newHeight);
            // Create a graphic based on the new bitmap
            Graphics oGraphics = Graphics.FromImage(newBMP);

            // Set the properties for the new graphic file
            oGraphics.SmoothingMode = SmoothingMode.AntiAlias; oGraphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
            // Draw the new graphic based on the resized bitmap
            oGraphics.DrawImage(originalBMP, 0, 0, newWidth, newHeight);


            // Save the new graphic file to the server
            newBMP.Save(directory + "tn_" + filename);

            // Once finished with the bitmap objects, we deallocate them.
            originalBMP.Dispose();
            newBMP.Dispose();
            oGraphics.Dispose();

            // Write a message to inform the user all is OK
            label.Text = "File Name: ">" + filename + "<br>";
            label.Text += "Content Type: ">" + fileUpload.PostedFile.ContentType + "<br>";
            label.Text += "File Size: ">" + fileUpload.PostedFile.ContentLength.ToString() + "";
            // Display the image to the user
            Image1.Visible = true;
            Image1.ImageUrl = @"/Uploaded-Files/tn_" + filename;
        }
        else
        {
            label.Text = "No file uploaded!";
        }
    }

    private ImageCodecInfo GetEncoder(ImageFormat format)
    {

        ImageCodecInfo[] codecs = ImageCodecInfo.GetImageDecoders();

        foreach (ImageCodecInfo codec in codecs)
        {
            if (codec.FormatID == format.Guid)
            {
                return codec;
            }
        }
        return null;
    }

解决方案

Please, use SearchBox[^] (73 pages!).

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