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Asp.NET压缩图片




 
#region 图片压缩(降低质量)Compress
        
private static ImageCodecInfo GetEncoderInfo(String mimeType)
        {
            
int j;
            ImageCodecInfo[] encoders;
            encoders 
= ImageCodecInfo.GetImageEncoders();
            
for(j = 0; j < encoders.Length; ++j)
            {
                
if(encoders[j].MimeType == mimeType)
                    
return encoders[j];
            }
            
return null;
        }
        
/// <summary>
        
/// 图片压缩(降低质量以减小文件的大小)
        
/// </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);
        }
        
/// <summary>
        
/// 图片压缩(降低质量以减小文件的大小)
        
/// </summary>
        
/// <param name="srcBitMap">传入的Bitmap对象</param>
        
/// <param name="destFile">压缩后的图片保存路径</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,string destFile,long level)
        {
            Stream s
= new FileStream(destFile,FileMode.Create);
            Compress(srcBitMap,s,level);
            s.Close();
        }
        
/// <summary>
        
/// 图片压缩(降低质量以减小文件的大小)
        
/// </summary>
        
/// <param name="srcFile">传入的Stream对象</param>
        
/// <param name="destFile">压缩后的图片保存路径</param>
        
/// <param name="level">压缩等级,0到100,0 最差质量,100 最佳</param>
        public static void Compress(Stream srcStream,string destFile,long level)
        {
            Bitmap bm 
= new Bitmap(srcStream);
            Compress(bm, destFile, level);
            bm.Dispose();
        }
        
/// <summary>
        
/// 图片压缩(降低质量以减小文件的大小)
        
/// </summary>
        
/// <param name="srcFile">传入的Image对象</param>
        
/// <param name="destFile">压缩后的图片保存路径</param>
        
/// <param name="level">压缩等级,0到100,0 最差质量,100 最佳</param>
        public static void Compress(Image srcImg,string destFile,long level)
        {
            Bitmap bm 
= new Bitmap(srcImg);
            Compress(bm, destFile, level);
            bm.Dispose();
        }
        
/// <summary>
        
/// 图片压缩(降低质量以减小文件的大小)
        
/// </summary>
        
/// <param name="srcFile">待压缩的BMP文件名</param>
        
/// <param name="destFile">压缩后的图片保存路径</param>
        
/// <param name="level">压缩等级,0到100,0 最差质量,100 最佳</param>
        public static void Compress(string srcFile,string destFile,long level)
        {
            
// Create a Bitmap object based on a BMP file.
            Bitmap bm = new Bitmap(srcFile);
            Compress(bm, destFile, level);
            bm.Dispose();
        }

        
#endregion 图片压缩(降低质量)
posted on 2009-04-17 18:11  西湖浪子  阅读(...)  评论(...编辑  收藏