C# image compression algorithm

Little scum · Posted on 11/23/2015 7:31:40 PM

/// <summary>
/// 壓縮圖片 /// </summary>
/// <param name="fileStream">圖片流</param>
/// <param name="quality">壓縮質量0-100之間數值越大質量越高</param>
/// <returns></returns>
private byte[] CompressionImage(Stream fileStream, long quality) {
using (System.Drawing.Image img = System.Drawing.Image.FromStream(fileStream)) {
using (Bitmap bitmap = new Bitmap(img)) {
ImageCodecInfo CodecInfo = GetEncoder(img.RawFormat);
System.Drawing.Imaging.Encoder myEncoder = System.Drawing.Imaging.Encoder.Quality;
EncoderParameters myEncoderParameters = new EncoderParameters(1);
EncoderParameter myEncoderParameter = new EncoderParameter(myEncoder, quality);
myEncoderParameters.Param[0] = myEncoderParameter;
using (MemoryStream ms = new MemoryStream()) {
bitmap.Save(ms, CodecInfo, myEncoderParameters);
myEncoderParameters.Dispose();
myEncoderParameter.Dispose();
return ms.ToArray();
}
}
}
}
調用:CompressionImage(stream,0L)//最低質量 1M jpg圖大概能壓成180k左右

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Little scum · Posted on 11/24/2015 11:10:10 AM

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[Source] C# image compression algorithm