图片加文字后质量变差的问题
用以下办法给图片加文字，原来有10k的图片变成6K了，请指教

System.Drawing.Image   image   =   System.Drawing.Image.FromFile( "d:\\img\\error.jpg ");  
Graphics   g   =   Graphics.FromImage(image);  
g.InterpolationMode       =       System.Drawing.Drawing2D.InterpolationMode.High;      
g.SmoothingMode       =       System.Drawing.Drawing2D.SmoothingMode.HighQuality;  
g.DrawImage(image,   0,   0,   image.Width,   image.Height);  
Font   f   =   new   Font( "宋体 ",3);
Brush   b;
b   =   new   SolidBrush(Color.Red);
string   addText   =   "ABCD ";  
g.DrawString(addText,   f,   b,   90,   170);  
g.Dispose();
image.Save( "d:\\img\\okfff1.jpg ");

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帮顶！
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抢个首发！
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直接保存不是高质量的
参考下面(Stream参数可以换为路径直接保存文件)：
/// <summary>
/// 图片压缩(改变质量以调整文件的大小)
/// </summary>
/// <param name= "srcBitmap "> 传入的Bitmap对象 </param>
/// <param name= "destStream "> 压缩后的Stream对象 </param>
/// <param name= "level "> 压缩等级，0到100，0 最差质量，100 最佳 </param>
public static void Compress(Bitmap srcBitmap,Stream destStream,long level)
{
ImageCodecInfo myImageCodecInfo;
Encoder myEncoder;
EncoderParameter myEncoderParameter;
EncoderParameters myEncoderParameters;

// Get an ImageCodecInfo object that represents the JPEG codec.
myImageCodecInfo = GetEncoderInfo( "image/jpeg ");

// Create an Encoder object based on the GUID

// for the Quality parameter category.
myEncoder = 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.
myEncoderParameters = new EncoderParameters(1);

// Save the bitmap as a JPEG file with 给定的 quality level
myEncoderParameter = new EncoderParameter(myEncoder, level);
myEncoderParameters.Param[0] = myEncoderParameter;
srcBitmap.Save(destStream, myImageCodecInfo, myEncoderParameters);
}
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指定一个适当的质量就可以了
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只是加字的话，以下方法即可，源文件压缩得还行.
public void AttachLogoOnBitmap(string file, string logo, int logoType, int x, int y)
{
try
{
if (file == null || file == string.Empty || logo == null || logo == string.Empty)
{
return;
}
MemoryStream s = new MemoryStream();
Image img = Image.FromFile(file);
Graphics graphics = Graphics.FromImage(img);
graphics.SmoothingMode = SmoothingMode.HighQuality;