Taking a low-quality picture of the screen [closed]

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I want to be able to take a low-quality image of the screen. I can take a bitmap picture, but no matter wha开发者_StackOverflow中文版t I do I can't lower its quality.

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Image bmp1 = GetScreenImage ();

// Save the image as a GIF.
bmp1.Save("c:\\button.gif", System.Drawing.Imaging.ImageFormat.Gif);

Msdn for more.

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I would try converting the image to a compressed jpeg. The nice thing about jpegs is that you can set how high the quality should be (i.e. how much you want it compressed):

Note: quality should be between 1 and 100 (100 being the largest size/highest quality and 1 being the smallest size/lowest quality.

public void save(string filename, Bitmap img, int quality)
{
   // quality encoding
   EncoderParameter qualParam = new EncoderParameter(Encoder.Quality, quality);

   // code for jpeg image type
   ImageCodecInfo jpegCodec = FindEncoderInfo("image/jpeg");


   EncoderParameters encoderParams = new EncoderParameters(1);
   encoderParams.Param[0] = qualParam;

   img.Save(filename, jpegCodec, encoderParams);
}

private ImageCodecInfo FindEncoderInfo(string mimeType)
{
   // search through all codecs for all formats
   ImageCodecInfo[] codecs = ImageCodecInfo.GetImageEncoders();

   for (int i = 0; i < codecs.Length; i++)
   {
      if (codecs[i].MimeType == mimeType)
      {
         return codecs[i];
      }
   }
   return null;
}