压缩图片-白红宇

压缩图片

阅读量：5167 次

发布时间：2019-06-13

本文共 1969 字，大约阅读时间需要 6 分钟。

1 ///  2         /// 压缩图片 3         /// 
 4         /// 图片字节数组 5         /// 压缩质量0-100之间，数值越大质量越高 6         /// 
      7         public static byte[] CompressionImage(byte[] fileByte, long quality) 8         { 9             using (MemoryStream fileStream = new MemoryStream(fileByte))10             {11                 using (System.Drawing.Image img = System.Drawing.Image.FromStream(fileStream))12                 {13                     using (Bitmap bitmap = new Bitmap(img))14                     {15                         ImageCodecInfo CodecInfo = GetEncoder(img.RawFormat);16                         System.Drawing.Imaging.Encoder myEncoder = System.Drawing.Imaging.Encoder.Quality;17                         EncoderParameters myEncoderParameters = new EncoderParameters(1);18                         EncoderParameter myEncoderParameter = new EncoderParameter(myEncoder, quality);19                         myEncoderParameters.Param[0] = myEncoderParameter;20                         using (MemoryStream ms = new MemoryStream())21                         {22                             bitmap.Save(ms, CodecInfo, myEncoderParameters);23                             myEncoderParameters.Dispose();24                             myEncoderParameter.Dispose();25                             return ms.ToArray();26                         }27                     }28                 }29             }30         }31         /// 32         /// 获取指定图片编码信息33         /// 
34         /// 35         /// 
     36         private static ImageCodecInfo GetEncoder(ImageFormat format)37         {38             ImageCodecInfo[] codecs = ImageCodecInfo.GetImageDecoders();39             foreach (ImageCodecInfo codec in codecs)40             {41                 if (codec.FormatID == format.Guid)42                 {43                     return codec;44                 }45             }46             return null;47         }