压缩png质量不改变像素

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private static  byte[] CompressionImage(Bitmap bitmap, Stream fileStream, long quality)
    {
        using (System.Drawing.Image img = System.Drawing.Image.FromStream(fileStream))
        {
 
            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();
            }
 
        }
    }
 
 
    private static ImageCodecInfo GetEncoder(ImageFormat format)
    {
        ImageCodecInfo[] codecs = ImageCodecInfo.GetImageDecoders();
 
        foreach (ImageCodecInfo codec in codecs)
        {
            if (codec.FormatID == format.Guid)
            {
                return codec;
            }
        }
        return null;
    }

  

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