1 /// <summary>
2 /// 压缩图片
3 /// </summary>
4 /// <param name="fileByte">图片字节数组</param>
5 /// <param name="quality">压缩质量0-100之间，数值越大质量越高</param>
6 /// <returns></returns>
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 /// <summary>
32 /// 获取指定图片编码信息
33 /// </summary>
34 /// <param name="format"></param>
35 /// <returns></returns>
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 }
