C#图片处理示例(裁剪,缩放,清晰度,水印)

概述C#图片处理示例(裁剪,缩放,清晰度,水印)

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using System;  using System.Collections.Generic;  using System.Text;  using System.IO;  using System.Drawing;  using System.Drawing.drawing2d;  using System.Drawing.Imaging;    namespace WuJian.Common  {      /// <summary>      /// 图片处理      /// http://www.cnblogs.com/wu-jian/      ///       /// 吴剑 2011-02-20 创建      /// 吴剑 2012-08-08 修改      /// </summary>      public class Image      {          #region 正方型裁剪并缩放            /// <summary>          /// 正方型裁剪          /// 以图片中心为轴心，截取正方型，然后等比缩放          /// 用于头像处理          /// </summary>          /// <remarks>吴剑 2012-08-08</remarks>          /// <param name="fromfile">原图Stream对象</param>          /// <param name="fileSaveUrl">缩略图存放地址</param>          /// <param name="sIDe">指定的边长（正方型）</param>          /// <param name="quality">质量（范围0-100）</param>          public static voID CutForSquare(System.IO.Stream fromfile,string fileSaveUrl,int sIDe,int quality)          {              //创建目录              string dir = Path.GetDirectoryname(fileSaveUrl);              if (!Directory.Exists(dir))                  Directory.CreateDirectory(dir);                //原始图片（获取原始图片创建对象，并使用流中嵌入的颜色管理信息）              System.Drawing.Image initimage = System.Drawing.Image.FromStream(fromfile,true);                //原图宽高均小于模版，不作处理，直接保存              if (initimage.WIDth <= sIDe && initimage.Height <= sIDe)              {                  initimage.Save(fileSaveUrl,System.Drawing.Imaging.ImageFormat.Jpeg);              }              else              {                  //原始图片的宽、高                  int initWIDth = initimage.WIDth;                  int initHeight = initimage.Height;                    //非正方型先裁剪为正方型                  if (initWIDth != initHeight)                  {                      //截图对象                      System.Drawing.Image pickedImage = null;                      system.drawing.graphics pickedG = null;                        //宽大于高的横图                      if (initWIDth > initHeight)                      {                          //对象实例化                          pickedImage = new System.Drawing.Bitmap(initHeight,initHeight);                          pickedG = system.drawing.graphics.FromImage(pickedImage);                          //设置质量                          pickedG.InterpolationMode = System.Drawing.drawing2d.InterpolationMode.HighQualityBicubic;                          pickedG.SmoothingMode = System.Drawing.drawing2d.SmoothingMode.HighQuality;                          //定位                          Rectangle fromr = new Rectangle((initWIDth - initHeight) / 2,initHeight,initHeight);                          Rectangle toR = new Rectangle(0,initHeight);                          //画图                          pickedG.DrawImage(initimage,toR,fromr,system.drawing.graphicsUnit.Pixel);                          //重置宽                          initWIDth = initHeight;                      }                      //高大于宽的竖图                      else                      {                          //对象实例化                          pickedImage = new System.Drawing.Bitmap(initWIDth,initWIDth);                          pickedG = system.drawing.graphics.FromImage(pickedImage);                          //设置质量                          pickedG.InterpolationMode = System.Drawing.drawing2d.InterpolationMode.HighQualityBicubic;                          pickedG.SmoothingMode = System.Drawing.drawing2d.SmoothingMode.HighQuality;                          //定位                          Rectangle fromr = new Rectangle(0,(initHeight - initWIDth) / 2,initWIDth,initWIDth);                          Rectangle toR = new Rectangle(0,initWIDth);                          //画图                          pickedG.DrawImage(initimage,system.drawing.graphicsUnit.Pixel);                          //重置高                          initHeight = initWIDth;                      }                        //将截图对象赋给原图                      initimage = (System.Drawing.Image)pickedImage.Clone();                      //释放截图资源                      pickedG.dispose();                      pickedImage.dispose();                  }                    //缩略图对象                  System.Drawing.Image resultimage = new System.Drawing.Bitmap(sIDe,sIDe);                  system.drawing.graphics resultG = system.drawing.graphics.FromImage(resultimage);                  //设置质量                  resultG.InterpolationMode = System.Drawing.drawing2d.InterpolationMode.HighQualityBicubic;                  resultG.SmoothingMode = System.Drawing.drawing2d.SmoothingMode.HighQuality;                  //用指定背景色清空画布                  resultG.Clear(color.White);                  //绘制缩略图                  resultG.DrawImage(initimage,new System.Drawing.Rectangle(0,sIDe,sIDe),initHeight),system.drawing.graphicsUnit.Pixel);                    //关键质量控制                  //获取系统编码类型数组,包含了jpeg,bmp,png,gif,tiff                  ImageCodecInfo[] icis = ImageCodecInfo.GetimageEncoders();                  ImageCodecInfo ici = null;                  foreach (ImageCodecInfo i in icis)                  {                      if (i.MimeType == "image/jpeg" || i.MimeType == "image/bmp" || i.MimeType == "image/png" || i.MimeType == "image/gif")                      {                          ici = i;                      }                  }                  EncoderParameters ep = new EncoderParameters(1);                  ep.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality,(long)quality);                    //保存缩略图                  resultimage.Save(fileSaveUrl,ici,ep);                    //释放关键质量控制所用资源                  ep.dispose();                    //释放缩略图资源                  resultG.dispose();                  resultimage.dispose();                    //释放原始图片资源                  initimage.dispose();              }          }           #endregion           #region 自定义裁剪并缩放            /// <summary>          /// 指定长宽裁剪          /// 按模版比例最大范围的裁剪图片并缩放至模版尺寸          /// </summary>          /// <remarks>吴剑 2012-08-08</remarks>          /// <param name="fromfile">原图Stream对象</param>          /// <param name="fileSaveUrl">保存路径</param>          /// <param name="maxWIDth">最大宽(单位:px)</param>          /// <param name="maxHeight">最大高(单位:px)</param>          /// <param name="quality">质量（范围0-100）</param>          public static voID CutForCustom(System.IO.Stream fromfile,int maxWIDth,int maxHeight,int quality)          {              //从文件获取原始图片，并使用流中嵌入的颜色管理信息              System.Drawing.Image initimage = System.Drawing.Image.FromStream(fromfile,true);                //原图宽高均小于模版，不作处理，直接保存              if (initimage.WIDth <= maxWIDth && initimage.Height <= maxHeight)              {                  initimage.Save(fileSaveUrl,System.Drawing.Imaging.ImageFormat.Jpeg);              }              else              {                  //模版的宽高比例                  double templaterate = (double)maxWIDth / maxHeight;                  //原图片的宽高比例                  double initRate = (double)initimage.WIDth / initimage.Height;                    //原图与模版比例相等，直接缩放                  if (templaterate == initRate)                  {                      //按模版大小生成最终图片                      System.Drawing.Image templateImage = new System.Drawing.Bitmap(maxWIDth,maxHeight);                      system.drawing.graphics templateG = system.drawing.graphics.FromImage(templateImage);                      templateG.InterpolationMode = System.Drawing.drawing2d.InterpolationMode.High;                      templateG.SmoothingMode = System.Drawing.drawing2d.SmoothingMode.HighQuality;                      templateG.Clear(color.White);                      templateG.DrawImage(initimage,maxWIDth,maxHeight),initimage.WIDth,initimage.Height),system.drawing.graphicsUnit.Pixel);                      templateImage.Save(fileSaveUrl,System.Drawing.Imaging.ImageFormat.Jpeg);                  }                  //原图与模版比例不等，裁剪后缩放                  else                  {                      //裁剪对象                      System.Drawing.Image pickedImage = null;                      system.drawing.graphics pickedG = null;                        //定位                      Rectangle fromr = new Rectangle(0,0);//原图裁剪定位                      Rectangle toR = new Rectangle(0,0);//目标定位                        //宽为标准进行裁剪                      if (templaterate > initRate)                      {                          //裁剪对象实例化                          pickedImage = new System.Drawing.Bitmap(initimage.WIDth,(int)System.Math.Floor(initimage.WIDth / templaterate));                          pickedG = system.drawing.graphics.FromImage(pickedImage);                            //裁剪源定位                          fromr.X = 0;                          fromr.Y = (int)System.Math.Floor((initimage.Height - initimage.WIDth / templaterate) / 2);                          fromr.WIDth = initimage.WIDth;                          fromr.Height = (int)System.Math.Floor(initimage.WIDth / templaterate);                            //裁剪目标定位                          toR.X = 0;                          toR.Y = 0;                          toR.WIDth = initimage.WIDth;                          toR.Height = (int)System.Math.Floor(initimage.WIDth / templaterate);                      }                      //高为标准进行裁剪                      else                      {                          pickedImage = new System.Drawing.Bitmap((int)System.Math.Floor(initimage.Height * templaterate),initimage.Height);                          pickedG = system.drawing.graphics.FromImage(pickedImage);                            fromr.X = (int)System.Math.Floor((initimage.WIDth - initimage.Height * templaterate) / 2);                          fromr.Y = 0;                          fromr.WIDth = (int)System.Math.Floor(initimage.Height * templaterate);                          fromr.Height = initimage.Height;                            toR.X = 0;                          toR.Y = 0;                          toR.WIDth = (int)System.Math.Floor(initimage.Height * templaterate);                          toR.Height = initimage.Height;                      }                        //设置质量                      pickedG.InterpolationMode = System.Drawing.drawing2d.InterpolationMode.HighQualityBicubic;                      pickedG.SmoothingMode = System.Drawing.drawing2d.SmoothingMode.HighQuality;                        //裁剪                      pickedG.DrawImage(initimage,system.drawing.graphicsUnit.Pixel);                        //按模版大小生成最终图片                      System.Drawing.Image templateImage = new System.Drawing.Bitmap(maxWIDth,maxHeight);                      system.drawing.graphics templateG = system.drawing.graphics.FromImage(templateImage);                      templateG.InterpolationMode = System.Drawing.drawing2d.InterpolationMode.High;                      templateG.SmoothingMode = System.Drawing.drawing2d.SmoothingMode.HighQuality;                      templateG.Clear(color.White);                      templateG.DrawImage(pickedImage,pickedImage.WIDth,pickedImage.Height),system.drawing.graphicsUnit.Pixel);                        //关键质量控制                      //获取系统编码类型数组,tiff                      ImageCodecInfo[] icis = ImageCodecInfo.GetimageEncoders();                      ImageCodecInfo ici = null;                      foreach (ImageCodecInfo i in icis)                      {                          if (i.MimeType == "image/jpeg" || i.MimeType == "image/bmp" || i.MimeType == "image/png" || i.MimeType == "image/gif")                          {                              ici = i;                          }                      }                      EncoderParameters ep = new EncoderParameters(1);                      ep.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality,(long)quality);                        //保存缩略图                      templateImage.Save(fileSaveUrl,ep);                      //templateImage.Save(fileSaveUrl,System.Drawing.Imaging.ImageFormat.Jpeg);                        //释放资源                      templateG.dispose();                      templateImage.dispose();                        pickedG.dispose();                      pickedImage.dispose();                  }              }                //释放资源              initimage.dispose();          }          #endregion           #region 等比缩放            /// <summary>          /// 图片等比缩放          /// </summary>          /// <remarks>吴剑 2012-08-08</remarks>          /// <param name="fromfile">原图Stream对象</param>          /// <param name="savePath">缩略图存放地址</param>          /// <param name="targetWIDth">指定的最大宽度</param>          /// <param name="targetHeight">指定的最大高度</param>          /// <param name="watermarkText">水印文字(为""表示不使用水印)</param>          /// <param name="watermarkImage">水印图片路径(为""表示不使用水印)</param>          public static voID Zoomauto(System.IO.Stream fromfile,string savePath,System.Double targetWIDth,System.Double targetHeight,string watermarkText,string watermarkImage)          {              //创建目录              string dir = Path.GetDirectoryname(savePath);              if (!Directory.Exists(dir))                  Directory.CreateDirectory(dir);                //原始图片（获取原始图片创建对象，并使用流中嵌入的颜色管理信息）              System.Drawing.Image initimage = System.Drawing.Image.FromStream(fromfile,true);                //原图宽高均小于模版，不作处理，直接保存              if (initimage.WIDth <= targetWIDth && initimage.Height <= targetHeight)              {                  //文字水印                  if (watermarkText != "")                  {                      using (system.drawing.graphics gWater = system.drawing.graphics.FromImage(initimage))                      {                          System.Drawing.Font FontWater = new Font("黑体",10);                          System.Drawing.Brush brushWater = new SolIDBrush(color.White);                          gWater.DrawString(watermarkText,FontWater,brushWater,10,10);                          gWater.dispose();                      }                  }                    //透明图片水印                  if (watermarkImage != "")                  {                      if (file.Exists(watermarkImage))                      {                          //获取水印图片                          using (System.Drawing.Image wrImage = System.Drawing.Image.Fromfile(watermarkImage))                          {                              //水印绘制条件：原始图片宽高均大于或等于水印图片                              if (initimage.WIDth >= wrImage.WIDth && initimage.Height >= wrImage.Height)                              {                                  Graphics gWater = Graphics.FromImage(initimage);                                    //透明属性                                  ImageAttributes imgAttributes = new ImageAttributes();                                  colorMap colorMap = new colorMap();                                  colorMap.oldcolor = color.FromArgb(255,255,0);                                  colorMap.Newcolor = color.FromArgb(0,0);                                  colorMap[] remaptable = { colorMap };                                  imgAttributes.SetRemaptable(remaptable,colorAdjustType.Bitmap);                                    float[][] colorMatrixElements = {                                      new float[] {1.0f,0.0f,0.0f},new float[] {0.0f,1.0f,0.5f,//透明度:0.5                                     new float[] {0.0f,1.0f}                                  };                                    colorMatrix wmcolorMatrix = new colorMatrix(colorMatrixElements);                                  imgAttributes.SetcolorMatrix(wmcolorMatrix,colorMatrixFlag.Default,colorAdjustType.Bitmap);                                  gWater.DrawImage(wrImage,new Rectangle(initimage.WIDth - wrImage.WIDth,initimage.Height - wrImage.Height,wrImage.WIDth,wrImage.Height),wrImage.Height,GraphicsUnit.Pixel,imgAttributes);                                    gWater.dispose();                              }                              wrImage.dispose();                          }                      }                  }                    //保存                  initimage.Save(savePath,System.Drawing.Imaging.ImageFormat.Jpeg);              }              else              {                  //缩略图宽、高计算                  double newWIDth = initimage.WIDth;                  double newHeight = initimage.Height;                    //宽大于高或宽等于高（横图或正方）                  if (initimage.WIDth > initimage.Height || initimage.WIDth == initimage.Height)                  {                      //如果宽大于模版                      if (initimage.WIDth > targetWIDth)                      {                          //宽按模版，高按比例缩放                          newWIDth = targetWIDth;                          newHeight = initimage.Height * (targetWIDth / initimage.WIDth);                      }                  }                  //高大于宽（竖图）                  else                  {                      //如果高大于模版                      if (initimage.Height > targetHeight)                      {                          //高按模版，宽按比例缩放                          newHeight = targetHeight;                          newWIDth = initimage.WIDth * (targetHeight / initimage.Height);                      }                  }                    //生成新图                  //新建一个bmp图片                  System.Drawing.Image newImage = new System.Drawing.Bitmap((int)newWIDth,(int)newHeight);                  //新建一个画板                  system.drawing.graphics newG = system.drawing.graphics.FromImage(newImage);                    //设置质量                  newG.InterpolationMode = System.Drawing.drawing2d.InterpolationMode.HighQualityBicubic;                  newG.SmoothingMode = System.Drawing.drawing2d.SmoothingMode.HighQuality;                    //置背景色                  newG.Clear(color.White);                  //画图                  newG.DrawImage(initimage,newImage.WIDth,newImage.Height),system.drawing.graphicsUnit.Pixel);                    //文字水印                  if (watermarkText != "")                  {                      using (system.drawing.graphics gWater = system.drawing.graphics.FromImage(newImage))                      {                          System.Drawing.Font FontWater = new Font("宋体",10);                          gWater.dispose();                      }                  }                    //透明图片水印                  if (watermarkImage != "")                  {                      if (file.Exists(watermarkImage))                      {                          //获取水印图片                          using (System.Drawing.Image wrImage = System.Drawing.Image.Fromfile(watermarkImage))                          {                              //水印绘制条件：原始图片宽高均大于或等于水印图片                              if (newImage.WIDth >= wrImage.WIDth && newImage.Height >= wrImage.Height)                              {                                  Graphics gWater = Graphics.FromImage(newImage);                                    //透明属性                                  ImageAttributes imgAttributes = new ImageAttributes();                                  colorMap colorMap = new colorMap();                                  colorMap.oldcolor = color.FromArgb(255,new Rectangle(newImage.WIDth - wrImage.WIDth,newImage.Height - wrImage.Height,imgAttributes);                                  gWater.dispose();                              }                              wrImage.dispose();                          }                      }                  }                    //保存缩略图                  newImage.Save(savePath,System.Drawing.Imaging.ImageFormat.Jpeg);                    //释放资源                  newG.dispose();                  newImage.dispose();                  initimage.dispose();              }          }           #endregion           #region 其它            /// <summary>          /// 判断文件类型是否为WEB格式图片          /// (注：JPG,GIF,BMP,PNG)          /// </summary>          /// <param name="ContentType">httpPostedfile.ContentType</param>          /// <returns></returns>          public static bool IsWebImage(string ContentType)          {              if (ContentType == "image/pjpeg" || ContentType == "image/jpeg" || ContentType == "image/gif" || ContentType == "image/bmp" || ContentType == "image/png")              {                  return true;              }              else              {                  return false;              }          }           #endregion        }//end class  }

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