网上搜集的一个比较实用的图片操作类

 

namespace System.Images.ImagesHelper {      /**/ /// <summary>      ///ImgOperate 的摘要说明      /// </summary>      public class ImagesHelper      {          图片处理类构造方法#region 图片处理类构造方法          /**/ /// <summary>          /// 图片处理类构造方法          /// </summary>          public ImagesHelper()          {              //              //TODO: 在此处添加构造函数逻辑              //          }          #endregion          用于缩小图片#region 用于缩小图片          //************************************************************//          //下面给出三个简单的方法，后面两个方法是扩展          //************************************************************//          /**/ /// <summary>          ///用于缩小图片          /// </summary>          /// <param name="strOldPic">原始图片路径</param>          /// <param name="strNewPic">新图片路径</param>          /// <param name="intWidth">新图片宽度</param>          /// <param name="intHeight">新图片高度</param>          /// <param name="isDeleteOldPic">是否删除原始图片</param>          public void ReducePic( string strOldPic, string strNewPic, int intWidth, int intHeight, bool isDeleteOldPic)          {              System.Drawing.Bitmap objPic, objNewPic;              try              {                  objPic = new System.Drawing.Bitmap(strOldPic);                  objNewPic = new System.Drawing.Bitmap(objPic, intWidth, intHeight);                  objNewPic.Save(strNewPic);                  objPic.Dispose();                  objNewPic.Dispose();                  if (isDeleteOldPic)                  {                      if (File.Exists(strOldPic))                      {                          File.Delete(strOldPic);                      }                  }                 }              catch (Exception exp) { throw exp; }              finally              {                  objPic = null ;                  objNewPic = null ;              }          }          /**/ /// <summary>          /// 将图片缩放至指定类型指定值          /// </summary>          /// <param name="strOldPic">原始图片路径</param>          /// <param name="strNewPic">新图片路径</param>          /// <param name="intValue">指定值</param>          /// <param name="type">缩放类型(W/w为指定宽度,H/h为指定高度)</param>          /// <param name="isDeleteOldPic">是否删除原始图片</param>          public  void ReducePic( string strOldPic, string strNewPic, int intValue, string type, bool isDeleteOldPic)          {              System.Drawing.Bitmap objPic, objNewPic;              int intWidth = 0;              int intHeight = 0;              try              {                  objPic = new System.Drawing.Bitmap(strOldPic);                  if (type == "W" || type == "w" )                  {                      intWidth = intValue;                      intHeight = Convert.ToInt32(((intWidth * 1.0) / (objPic.Width * 1.0)) * objPic.Height);                  }                  else if (type == "H" || type == "h" )                  {                      intHeight = intValue;                      intWidth = Convert.ToInt32(((intHeight * 1.0) / (objPic.Height * 1.0)) * objPic.Width);                  }                  else                  {                      throw new Exception( "未指定图片缩放类型" );                  }                  objNewPic = new System.Drawing.Bitmap(objPic, intWidth, intHeight);                  objNewPic.Save(strNewPic);                  objPic.Dispose();                  objNewPic.Dispose();                  if (isDeleteOldPic)                  {                      if (File.Exists(strOldPic))                      {                          File.Delete(strOldPic);                      }                  }                 }              catch (Exception exp) { throw exp; }              finally              {                  objPic = null ;                  objNewPic = null ;              }          }          /**/ /// <summary>          /// 用于缩放图片          /// </summary>          /// <param name="strOldPic">原始图片路径</param>          /// <param name="strNewPic">新图片路径</param>          /// <param name="balance">缩放比例</param>          /// <param name="isDeleteOldPic">是否删除原始图片</param>          public  void ReducePic( string strOldPic, string strNewPic, double balance, bool isDeleteOldPic)          {              System.Drawing.Bitmap objPic, objNewPic;              try              {                  objPic = new System.Drawing.Bitmap(strOldPic);                  int intWidth = Convert.ToInt32((objPic.Width) * balance);                  int intHeight = Convert.ToInt32((objPic.Height) * balance);                  objNewPic = new System.Drawing.Bitmap(objPic, intWidth, intHeight);                  objNewPic.Save(strNewPic);                  objPic.Dispose();                  objNewPic.Dispose();                  if (isDeleteOldPic)                  {                      if (File.Exists(strOldPic))                      {                          File.Delete(strOldPic);                      }                  }                 }              catch (Exception exp) { throw exp; }              finally              {                  objPic = null ;                  objNewPic = null ;              }          }          /**/ /// <summary>          /// 获取图片指定部分          /// </summary>          /// <param name="pPath">图片路径</param>          /// <param name="pSavePath">保存路径</param>          /// <param name="pPartStartPointX">目标图片开始绘制处的坐标X值(通常为)</param>          /// <param name="pPartStartPointY">目标图片开始绘制处的坐标Y值(通常为)</param>          /// <param name="pPartWidth">目标图片的宽度</param>          /// <param name="pPartHeight">目标图片的高度</param>          /// <param name="pOrigStartPointX">原始图片开始截取处的坐标X值</param>          /// <param name="pOrigStartPointY">原始图片开始截取处的坐标Y值</param>          public void ReducePic( string pPath, string pSavedPath, int pPartStartPointX, int pPartStartPointY, int pPartWidth, int pPartHeight, int pOrigStartPointX, int pOrigStartPointY)          {              System.Drawing.Image originalImg = System.Drawing.Image.FromFile(pPath);              Bitmap partImg = new Bitmap(pPartWidth, pPartHeight);              Graphics graphics = Graphics.FromImage(partImg);              Rectangle destRect = new Rectangle( new Point(pPartStartPointX, pPartStartPointY), new Size(pPartWidth, pPartHeight)); //目标位置              Rectangle origRect = new Rectangle( new Point(pOrigStartPointX, pOrigStartPointY), new Size(pPartWidth, pPartHeight)); //原图位置（默认从原图中截取的图片大小等于目标图片的大小）              graphics.DrawImage(originalImg, destRect, origRect, GraphicsUnit.Pixel);              partImg.Save(pSavedPath, ImageFormat.Jpeg);          }          #endregion          添加水印文字#region 添加水印文字          /**/ /// <summary>          /// 为上传的图片添加水印文字          /// </summary>          /// <param name="Path">原始图片路径</param>          /// <param name="Path_sy">水印图片路径</param>          /// <param name="WaterText">水印文字</param>          public  void AddWaterText( string Path, string Path_sy, string WaterText)          {              string addText = WaterText;              System.Drawing.Image image = System.Drawing.Image.FromFile(Path);              System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(image);              g.DrawImage(image, 0, 0, image.Width, image.Height);              System.Drawing.Font f = new System.Drawing.Font( "Verdana" , 10);              System.Drawing.Brush b = new System.Drawing.SolidBrush(System.Drawing.Color.LightSlateGray);              g.DrawString(addText, f, b, image.Width - 100, image.Height - 20);              g.Dispose();              image.Save(Path_sy);              image.Dispose();          }          #endregion          为图片增加水印图片#region 为图片增加水印图片          /**/ /// <summary>          /// 在图片上生成图片水印          /// </summary>          /// <param name="Path">原服务器图片路径</param>          /// <param name="Path_syp">生成的带图片水印的图片路径</param>          /// <param name="Path_sypf">水印图片路径</param>          public  void AddWaterPic( string Path, string Path_syp, string Path_sypf)          {              System.Drawing.Image image = System.Drawing.Image.FromFile(Path);              System.Drawing.Image copyImage = System.Drawing.Image.FromFile(Path_sypf);              System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(image);              g.DrawImage(copyImage, new System.Drawing.Rectangle(image.Width - copyImage.Width, image.Height - copyImage.Height, copyImage.Width, copyImage.Height), 0, 0, copyImage.Width, copyImage.Height, System.Drawing.GraphicsUnit.Pixel);              g.Dispose();              image.Save(Path_syp);              image.Dispose();          }          #endregion          获取图片的高度和宽度#region 获取图片的高度和宽度          /**/ /// <summary>          /// 获取图片的高度和宽度          /// </summary>          /// <param name="imgurl">img图片的地址</param>          /// <returns></returns>          public int [] GetImgWidth( string imgurl)          {              System.Drawing.Image image;              image = System.Drawing.Image.FromFile(imgurl);              int imgwidth = image.Width;              int imgHeight = image.Height;              int [] img = { imgwidth, imgHeight };              return img;          }          #endregion          压缩图片#region 压缩图片          /**/ /// <summary>          /// 对图片进行压缩          /// </summary>          /// <param name="filePath">原始图片路径</param>          /// <param name="filePath_ystp">压缩后的图片路径</param>          public void DensityPic( string filePath, string filePath_ystp) //压缩图片           {              Bitmap bmp = new Bitmap(filePath);              //ImageCoderInfo               ImageCodecInfo ici = null ;              //Encoder               System.Drawing.Imaging.Encoder ecd = null ;              //EncoderParameter               EncoderParameter ept = null ;              //EncoderParameters               EncoderParameters eptS = null ;              try              {                  ici = this .getImageCoderInfo( "image/jpeg" );                  ecd = System.Drawing.Imaging.Encoder.Quality;                  eptS = new EncoderParameters(1);                  ept = new EncoderParameter(ecd, 10L);                  eptS.Param[0] = ept;                  bmp.Save(filePath_ystp, ici, eptS);              }                     catch (Exception ex)              {                  throw new Exception(ex.Message);              }              finally              {                  bmp.Dispose();                  ept.Dispose();                  eptS.Dispose();              }          }          private ImageCodecInfo getImageCoderInfo( string coderType) // 获取图片编码类型信息           {              ImageCodecInfo[] iciS = ImageCodecInfo.GetImageEncoders();              ImageCodecInfo retIci = null ;              foreach (ImageCodecInfo ici in iciS)              {                  if (ici.MimeType.Equals(coderType))                      retIci = ici;              }                 return retIci;          }          #endregion          获取图片的指定部分#region 获取图片的指定部分          /**/ /**/          /**/ /// <summary>          /// 获取图片指定部分          /// </summary>          /// <param name="pPath">图片路径</param>          /// <param name="pSavePath">保存路径</param>          /// <param name="pPartStartPointX">目标图片开始绘制处的坐标X值(通常为)</param>          /// <param name="pPartStartPointY">目标图片开始绘制处的坐标Y值(通常为)</param>          /// <param name="pPartWidth">目标图片的宽度</param>          /// <param name="pPartHeight">目标图片的高度</param>          /// <param name="pOrigStartPointX">原始图片开始截取处的坐标X值</param>          /// <param name="pOrigStartPointY">原始图片开始截取处的坐标Y值</param>          /// <param name="pFormat">保存格式，通常可以是jpeg</param>          public void GetPart( string pPath, string pSavedPath, int pPartStartPointX, int pPartStartPointY, int pPartWidth, int pPartHeight, int pOrigStartPointX, int pOrigStartPointY)          {              string normalJpgPath = pSavedPath;                 using (System.Drawing.Image originalImg = System.Drawing.Image.FromFile(pPath))              {                  Bitmap partImg = new Bitmap(pPartWidth, pPartHeight);                  Graphics graphics = Graphics.FromImage(partImg);                  Rectangle destRect = new Rectangle( new Point(pPartStartPointX, pPartStartPointY), new Size(pPartWidth, pPartHeight)); //目标位置                  Rectangle origRect = new Rectangle( new Point(pOrigStartPointX, pOrigStartPointY), new Size(pPartWidth, pPartHeight)); //原图位置（默认从原图中截取的图片大小等于目标图片的大小）                        /**/ ///文字水印                    System.Drawing.Graphics G = System.Drawing.Graphics.FromImage(partImg);                  System.Drawing.Font f = new Font( "Lucida Grande" , 6);                  System.Drawing.Brush b = new SolidBrush(Color.Gray);                  G.Clear(Color.White);                  graphics.DrawImage(originalImg, destRect, origRect, GraphicsUnit.Pixel);                  G.DrawString( "TianTang.Com" , f, b, 0, 0);                  G.Dispose();                     originalImg.Dispose();                  if (File.Exists(normalJpgPath))                  {                      File.SetAttributes(normalJpgPath, FileAttributes.Normal);                      File.Delete(normalJpgPath);                  }                  partImg.Save(normalJpgPath, ImageFormat.Jpeg);              }          }          #endregion          获取图片的指定部分#region 获取图片的指定部分          /**/ /**/          /**/ /// <summary>          /// 获取按比例缩放的图片指定部分          /// </summary>          /// <param name="pPath">图片路径</param>          /// <param name="pSavePath">保存路径</param>          /// <param name="pPartStartPointX">目标图片开始绘制处的坐标X值(通常为)</param>          /// <param name="pPartStartPointY">目标图片开始绘制处的坐标Y值(通常为)</param>          /// <param name="pPartWidth">目标图片的宽度</param>          /// <param name="pPartHeight">目标图片的高度</param>          /// <param name="pOrigStartPointX">原始图片开始截取处的坐标X值</param>          /// <param name="pOrigStartPointY">原始图片开始截取处的坐标Y值</param>          /// <param name="imageWidth">缩放后的宽度</param>          /// <param name="imageHeight">缩放后的高度</param>          public void GetPart( string pPath, string pSavedPath, int pPartStartPointX, int pPartStartPointY, int pPartWidth, int pPartHeight, int pOrigStartPointX, int pOrigStartPointY, int imageWidth, int imageHeight)          {              string normalJpgPath = pSavedPath;              using (System.Drawing.Image originalImg = System.Drawing.Image.FromFile(pPath))              {                  if (originalImg.Width == imageWidth && originalImg.Height == imageHeight)                  {                      GetPart(pPath, pSavedPath, pPartStartPointX, pPartStartPointY, pPartWidth, pPartHeight, pOrigStartPointX, pOrigStartPointY);                      return ;                  }                     System.Drawing.Image.GetThumbnailImageAbort callback = new System.Drawing.Image.GetThumbnailImageAbort(ThumbnailCallback);                  System.Drawing.Image zoomImg = originalImg.GetThumbnailImage(imageWidth, imageHeight, callback, IntPtr.Zero); //缩放                  Bitmap partImg = new Bitmap(pPartWidth, pPartHeight);                     Graphics graphics = Graphics.FromImage(partImg);                  Rectangle destRect = new Rectangle( new Point(pPartStartPointX, pPartStartPointY), new Size(pPartWidth, pPartHeight)); //目标位置                  Rectangle origRect = new Rectangle( new Point(pOrigStartPointX, pOrigStartPointY), new Size(pPartWidth, pPartHeight)); //原图位置（默认从原图中截取的图片大小等于目标图片的大小）                     /**/ ///文字水印                    System.Drawing.Graphics G = System.Drawing.Graphics.FromImage(partImg);                  System.Drawing.Font f = new Font( "Lucida Grande" , 6);                  System.Drawing.Brush b = new SolidBrush(Color.Gray);                  G.Clear(Color.White);                     graphics.DrawImage(zoomImg, destRect, origRect, GraphicsUnit.Pixel);                  G.DrawString( "TianTang.Com" , f, b, 0, 0);                  G.Dispose();                     originalImg.Dispose();                  if (File.Exists(normalJpgPath))                  {                      File.SetAttributes(normalJpgPath, FileAttributes.Normal);                      File.Delete(normalJpgPath);                  }                  partImg.Save(normalJpgPath, ImageFormat.Jpeg);              }          }          public bool ThumbnailCallback()          {              return false ;          }          #endregion      } }   转自：http://www.cnblogs.com/MrWby/archive/2010/05/28/1746726.html