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c# 无损高质量压缩图片代码
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- public static bool GetPicThumbnail(string sFile, string dFile, int dHeight, int dWidth, int flag)
- {
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- System.Drawing.Image iSource = System.Drawing.Image.FromFile(sFile);
- ImageFormat tFormat = iSource.RawFormat;
- int sW = 0, sH = 0;
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- Size tem_size = new Size(iSource.Width, iSource.Height);
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- if (tem_size.Width > dHeight || tem_size.Width > dWidth)
- {
- if ((tem_size.Width * dHeight) > (tem_size.Height * dWidth))
- {
- sW = dWidth;
- sH = (dWidth * tem_size.Height) / tem_size.Width;
- }
- else
- {
- sH = dHeight;
- sW = (tem_size.Width * dHeight) / tem_size.Height;
- }
- }
- else
- {
- sW = tem_size.Width;
- sH = tem_size.Height;
- }
- Bitmap ob = new Bitmap(dWidth, dHeight);
- Graphics g = Graphics.FromImage(ob);
- g.Clear(Color.WhiteSmoke);
- g.CompositingQuality = CompositingQuality.HighQuality;
- g.SmoothingMode = SmoothingMode.HighQuality;
- g.InterpolationMode = InterpolationMode.HighQualityBicubic;
- g.DrawImage(iSource, new Rectangle((dWidth - sW) / 2, (dHeight - sH) / 2, sW, sH), 0, 0, iSource.Width, iSource.Height, GraphicsUnit.Pixel);
- g.Dispose();
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- EncoderParameters ep = new EncoderParameters();
- long[] qy = new long[1];
- qy[0] = flag;
- EncoderParameter eParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, qy);
- ep.Param[0] = eParam;
- try
- {
- ImageCodecInfo[] arrayICI = ImageCodecInfo.GetImageEncoders();
- ImageCodecInfo jpegICIinfo = null;
- for (int x = 0; x < arrayICI.Length; x++)
- {
- if (arrayICI[x].FormatDescription.Equals("JPEG"))
- {
- jpegICIinfo = arrayICI[x];
- break;
- }
- }
- if (jpegICIinfo != null)
- {
- ob.Save(dFile, jpegICIinfo, ep);
- }
- else
- {
- ob.Save(dFile, tFormat);
- }
- return true;
- }
- catch
- {
- return false;
- }
- finally
- {
- iSource.Dispose();
- ob.Dispose();
- }
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- }
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原文地址:https://www.cnblogs.com/Alex80/p/5127123.html
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