/reference namespace
Using System.Drawing.Imaging;
Using System.Drawing;
Using System.Drawing.Drawing2D;
#region GetPicThumbnail /// <summary> /// 无损压缩图片 /// </summary> /// <param name="sFile">原图片</param> /// <param name="dFile">压缩后保存位置</param> /// <param name="dHeight">高度</param> /// <param name="dWidth"></param> /// <param name="flag">压缩质量 1-100</param> /// <returns></returns> publicboolGetPicThumbnail(stringsFile, stringdFile, intdHeight, intdWidth, intflag) { System.Drawing.Image iSource = System.Drawing.Image.FromFile(sFile); ImageFormat tFormat = iSource.RawFormat; intsW = 0, sH = 0; //按比例缩放 Size tem_size = newSize(iSource.Width, iSource.Height); if(tem_size.Width > dHeight || tem_size.Width > dWidth) //将**改成c#中的或者操作符号 { 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 = newBitmap(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, newRectangle((dWidth - sW) / 2, (dHeight - sH) / 2, sW, sH), 0, 0, iSource.Width, iSource.Height, GraphicsUnit.Pixel); g.Dispose(); //以下代码为保存图片时，设置压缩质量 EncoderParameters ep = newEncoderParameters(); long[] qy = newlong[1]; qy[0] = flag;//设置压缩的比例1-100 EncoderParameter eParam = newEncoderParameter(System.Drawing.Imaging.Encoder.Quality, qy); ep.Param[0] = eParam; try { ImageCodecInfo[] arrayICI = ImageCodecInfo.GetImageEncoders(); ImageCodecInfo jpegICIinfo = null; for(intx = 0; x < arrayICI.Length; x++) { if(arrayICI[x].FormatDescription.Equals("JPEG")) { jpegICIinfo = arrayICI[x]; break; } } if(jpegICIinfo != null) { ob.Save(dFile, jpegICIinfo, ep);//dFile是压缩后的新路径 } else { ob.Save(dFile, tFormat); } returntrue; } catch { returnfalse; } finally { iSource.Dispose(); ob.Dispose(); } } #endregion |
C # Picture Lossless compression
