【C#】给图片添加水印与图片剪切完整实例

admin · 发表于 2017-8-26 22:45:36

这篇文章主要介绍了C#给图片添加水印的方法,以完整实例形式分析了C#实现文字及图像水印、缩略图、图片剪切等相关技巧

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Drawing;
using System.IO;
using System.Drawing.Imaging;
/// <summary>
///ImgWater 的摘要说明
/// </summary>
public class ImgWater
{
public ImgWater()
{
      //
      //TODO: 在此处添加构造函数逻辑
      //
}
/// <summary>
/// 图片水印
/// </summary>
/// <param name="ImgFile">原图文件地址</param>
/// <param name="WaterImg">水印图片地址</param>
/// <param name="sImgPath">水印图片保存地址</param>
/// <param name="Alpha">水印透明度设置</param>
/// <param name="iScale">水印图片在原图上的显示比例</param>
/// <param name="intDistance">水印图片在原图上的边距确定,以图片的右边和下边为准,当设定的边距超过一定大小后参数会自动失效</param>
public bool zzsImgWater(
   string ImgFile
   , string WaterImg
   , string sImgPath
   , float Alpha
   , float iScale
   , int intDistance
   )
{
      try
      {
         //装载图片
         FileStream fs = new FileStream(ImgFile, FileMode.Open);
         BinaryReader br = new BinaryReader(fs);
         byte[] bytes = br.ReadBytes((int)fs.Length);
         br.Close();
         fs.Close();
         MemoryStream ms = new MemoryStream(bytes);
         System.Drawing.Image imgPhoto = System.Drawing.Image.FromStream(ms);
         //System.Drawing.Image imgPhoto = System.Drawing.Image.FromFile(ImgFile);
         int imgPhotoWidth = imgPhoto.Width;
         int imgPhotoHeight = imgPhoto.Height;
         System.Drawing.Image imgWatermark = new Bitmap(WaterImg);
         int imgWatermarkWidth = imgWatermark.Width;
         int imgWatermarkHeight = imgWatermark.Height;
         //计算水印图片尺寸
         decimal aScale = Convert.ToDecimal(iScale);
         decimal pScale = 0.05M;
         decimal MinScale = aScale - pScale;
         decimal MaxScale = aScale + pScale;
         int imgWatermarkWidthNew = imgWatermarkWidth;
         int imgWatermarkHeightNew = imgWatermarkHeight;
         if (imgPhotoWidth >= imgWatermarkWidth && imgPhotoHeight >= imgWatermarkHeight && imgPhotoWidth >= imgPhotoHeight)
            if (imgWatermarkWidth > imgWatermarkHeight)
                  if ((MinScale <= Math.Round((Convert.ToDecimal(imgWatermarkWidth) / Convert.ToDecimal(imgPhotoWidth)), 7)) && (Math.Round((Convert.ToDecimal(imgWatermarkWidth) / Convert.ToDecimal(imgPhotoWidth)), 7) <= MaxScale))
                  {
                  }
                  else
                  {
                     imgWatermarkWidthNew = Convert.ToInt32(imgPhotoWidth * aScale);
                     imgWatermarkHeightNew = Convert.ToInt32((imgPhotoWidth * aScale / imgWatermarkWidth) * imgWatermarkHeight);
                  }
            else
               if ((MinScale <= Math.Round((Convert.ToDecimal(imgWatermarkHeight) / Convert.ToDecimal(imgPhotoHeight)), 7)) && (Math.Round((Convert.ToDecimal(imgWatermarkHeight) / Convert.ToDecimal(imgPhotoHeight)), 7) <= MaxScale))
            {
            }
            else
            {
                  imgWatermarkHeightNew = Convert.ToInt32(imgPhotoHeight * aScale);
                  imgWatermarkWidthNew = Convert.ToInt32((imgPhotoHeight * aScale / imgWatermarkHeight) * imgWatermarkWidth);
            }
         if (imgWatermarkWidth >= imgPhotoWidth && imgWatermarkHeight >= imgPhotoHeight && imgWatermarkWidth >= imgWatermarkHeight)
         {
            imgWatermarkWidthNew = Convert.ToInt32(imgPhotoWidth * aScale);
            imgWatermarkHeightNew = Convert.ToInt32(((imgPhotoWidth * aScale) / imgWatermarkWidth) * imgWatermarkHeight);
         }
         if (imgWatermarkWidth >= imgPhotoWidth && imgWatermarkHeight <= imgPhotoHeight && imgPhotoWidth >= imgPhotoHeight)
         {
            imgWatermarkWidthNew = Convert.ToInt32(imgPhotoWidth * aScale);
            imgWatermarkHeightNew = Convert.ToInt32(((imgPhotoWidth * aScale) / imgWatermarkWidth) * imgWatermarkHeight);
         }
         if (imgWatermarkWidth <= imgPhotoWidth && imgWatermarkHeight >= imgPhotoHeight && imgPhotoWidth >= imgPhotoHeight)
         {
            imgWatermarkHeightNew = Convert.ToInt32(imgPhotoHeight * aScale);
            imgWatermarkWidthNew = Convert.ToInt32(((imgPhotoHeight * aScale) / imgWatermarkHeight) * imgWatermarkWidth);
         }
         if (imgPhotoWidth >= imgWatermarkWidth && imgPhotoHeight >= imgWatermarkHeight && imgPhotoWidth <= imgPhotoHeight)
            if (imgWatermarkWidth > imgWatermarkHeight)
                  if ((MinScale <= Math.Round((Convert.ToDecimal(imgWatermarkWidth) / Convert.ToDecimal(imgPhotoWidth)), 7)) && (Math.Round((Convert.ToDecimal(imgWatermarkWidth) / Convert.ToDecimal(imgPhotoWidth)), 7) <= MaxScale))
                  {
                  }
                  else
                  {
                     imgWatermarkWidthNew = Convert.ToInt32(imgPhotoWidth * aScale);
                     imgWatermarkHeightNew = Convert.ToInt32(((imgPhotoWidth * aScale) / imgWatermarkWidth) * imgWatermarkHeight);
                  }
            else
               if ((MinScale <= Math.Round((Convert.ToDecimal(imgWatermarkHeight) / Convert.ToDecimal(imgPhotoHeight)), 7)) && (Math.Round((Convert.ToDecimal(imgWatermarkHeight) / Convert.ToDecimal(imgPhotoHeight)), 7) <= MaxScale))
            {
            }
            else
            {
                  imgWatermarkHeightNew = Convert.ToInt32(imgPhotoHeight * aScale);
                  imgWatermarkWidthNew = Convert.ToInt32(((imgPhotoHeight * aScale) / imgWatermarkHeight) * imgWatermarkWidth);
            }
         if (imgWatermarkWidth >= imgPhotoWidth && imgWatermarkHeight >= imgPhotoHeight && imgWatermarkWidth <= imgWatermarkHeight)
         {
            imgWatermarkHeightNew = Convert.ToInt32(imgPhotoHeight * aScale);
            imgWatermarkWidthNew = Convert.ToInt32(((imgPhotoHeight * aScale) / imgWatermarkHeight) * imgWatermarkWidth);
         }
         if (imgWatermarkWidth >= imgPhotoWidth && imgWatermarkHeight <= imgPhotoHeight && imgPhotoWidth <= imgPhotoHeight)
         {
            imgWatermarkWidthNew = Convert.ToInt32(imgPhotoWidth * aScale);
            imgWatermarkHeightNew = Convert.ToInt32(((imgPhotoWidth * aScale) / imgWatermarkWidth) * imgWatermarkHeight);
         }
         if (imgWatermarkWidth <= imgPhotoWidth && imgWatermarkHeight >= imgPhotoHeight && imgPhotoWidth <= imgPhotoHeight)
         {
            imgWatermarkHeightNew = Convert.ToInt32(imgPhotoHeight * aScale);
            imgWatermarkWidthNew = Convert.ToInt32(((imgPhotoHeight * aScale) / imgWatermarkHeight) * imgWatermarkWidth);
         }
         //将原图画出来
         Bitmap bmPhoto = new Bitmap(imgPhotoWidth, imgPhotoHeight, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
         bmPhoto.SetResolution(72, 72);
         Graphics gbmPhoto = Graphics.FromImage(bmPhoto);
         gbmPhoto.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
         gbmPhoto.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
         gbmPhoto.Clear(Color.White);
         gbmPhoto.DrawImage(
            imgPhoto
         , new Rectangle(0, 0, imgPhotoWidth, imgPhotoHeight)
         , 0
         , 0
         , imgPhotoWidth
         , imgPhotoHeight
         , GraphicsUnit.Pixel
         );
         Bitmap bmWatermark = new Bitmap(bmPhoto);
         bmWatermark.SetResolution(imgPhoto.HorizontalResolution, imgPhoto.VerticalResolution);
         Graphics gWatermark = Graphics.FromImage(bmWatermark);
         //指定高质量显示水印图片质量
         gWatermark.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
         gWatermark.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
         ImageAttributes imageAttributes = new ImageAttributes();
         //设置两种颜色,达到合成效果
         ColorMap colorMap = new ColorMap();
         colorMap.OldColor = Color.FromArgb(255, 0, 255, 0);
         colorMap.NewColor = Color.FromArgb(0, 0, 0, 0);
         ColorMap[] remapTable = { colorMap };
         imageAttributes.SetRemapTable(remapTable, System.Drawing.Imaging.ColorAdjustType.Bitmap);
         //用矩阵设置水印图片透明度
         float[][] colorMatrixElements = {
new float[] {1.0f, 0.0f, 0.0f, 0.0f, 0.0f},
new float[] {0.0f, 1.0f, 0.0f, 0.0f, 0.0f},
new float[] {0.0f, 0.0f, 1.0f, 0.0f, 0.0f},
new float[] {0.0f, 0.0f, 0.0f, Alpha, 0.0f},
new float[] {0.0f, 0.0f, 0.0f, 0.0f, 1.0f}
};
         System.Drawing.Imaging.ColorMatrix wmColorMatrix = new System.Drawing.Imaging.ColorMatrix(colorMatrixElements);
         imageAttributes.SetColorMatrix(wmColorMatrix, System.Drawing.Imaging.ColorMatrixFlag.Default, System.Drawing.Imaging.ColorAdjustType.Bitmap);
         //确定水印边距
         int xPos = imgPhotoWidth - imgWatermarkWidthNew;
         int yPos = imgPhotoHeight - imgWatermarkHeightNew;
         int xPosOfWm = 0;
         int yPosOfWm = 0;
         if (xPos > intDistance)
            xPosOfWm = xPos - intDistance;
         else
            xPosOfWm = xPos;
         if (yPos > intDistance)
            yPosOfWm = yPos - intDistance;
         else
            yPosOfWm = yPos;
         gWatermark.DrawImage(
            imgWatermark
         , new Rectangle(xPosOfWm, yPosOfWm, imgWatermarkWidthNew, imgWatermarkHeightNew)
         , 0
         , 0
         , imgWatermarkWidth
         , imgWatermarkHeight
         , GraphicsUnit.Pixel
         , imageAttributes
         );
         imgPhoto = bmWatermark;
         //以jpg格式保存图片
         imgPhoto.Save(sImgPath, System.Drawing.Imaging.ImageFormat.Jpeg);
         //销毁对象
         gbmPhoto.Dispose();
         gWatermark.Dispose();
         imgPhoto.Dispose();
         imgWatermark.Dispose();
         return true;
      }
      catch
      {
         return false;
      }
}
/**//// <summary>
      /// 文字水印
      /// </summary>
      /// <param name="ImgFile">原图文件地址</param>
      /// <param name="TextFont">水印文字</param>
      /// <param name="sImgPath">文字水印图片保存地址</param>
      /// <param name="hScale">高度位置</param>
      /// <param name="widthFont">文字块在图片中所占宽度比例</param>
      /// <param name="Alpha">文字透明度其数值的范围在0到255</param>
public bool zzsTextWater(
   string ImgFile
   , string TextFont
   , string sImgPath
   , float hScale
   , float widthFont
   , int Alpha
   )
{
      try
      {
         FileStream fs = new FileStream(ImgFile, FileMode.Open);
         BinaryReader br = new BinaryReader(fs);
         byte[] bytes = br.ReadBytes((int)fs.Length);
         br.Close();
         fs.Close();
         MemoryStream ms = new MemoryStream(bytes);
         System.Drawing.Image imgPhoto = System.Drawing.Image.FromStream(ms);
         //System.Drawing.Image imgPhoto = System.Drawing.Image.FromFile(ImgFile);
         int imgPhotoWidth = imgPhoto.Width;
         int imgPhotoHeight = imgPhoto.Height;
         Bitmap bmPhoto = new Bitmap(imgPhotoWidth, imgPhotoHeight, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
         bmPhoto.SetResolution(72, 72);
         Graphics gbmPhoto = Graphics.FromImage(bmPhoto);
         gbmPhoto.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
         gbmPhoto.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
         gbmPhoto.DrawImage(
            imgPhoto
         , new Rectangle(0, 0, imgPhotoWidth, imgPhotoHeight)
         , 0
         , 0
         , imgPhotoWidth
         , imgPhotoHeight
         , GraphicsUnit.Pixel
         );
         //建立字体大小的数组,循环找出适合图片的水印字体
         //int[] sizes = new int[] { 1000, 800, 700, 650, 600, 560, 540, 500, 450, 400, 380, 360, 340, 320, 300, 280, 260, 240, 220, 200, 180, 160, 140, 120, 100, 80, 72, 64, 48, 32, 28, 26, 24, 20, 28, 16, 14, 12, 10, 8, 6, 4, 2 };
         int[] sizes = new int[] { 28, 26, 24, 20, 16, 14, 12 };
         System.Drawing.Font crFont = null;
         System.Drawing.SizeF crSize = new SizeF();
         for (int i = 0; i < 7; i++)
         {
            crFont = new Font("微软雅黑", sizes, FontStyle.Bold);
            crSize = gbmPhoto.MeasureString(TextFont, crFont);
            if ((ushort)crSize.Width < (ushort)imgPhotoWidth * widthFont)
                  break;
         }
         //设置水印字体的位置
         //int yPixlesFromBottom = (int)(imgPhotoHeight * hScale);
         //float yPosFromBottom = ((imgPhotoHeight - yPixlesFromBottom) - (crSize.Height / 2));
         //float xCenterOfImg = (imgPhotoWidth * 1 / 2);
         float yPosFromBottom = imgPhotoHeight * 0.85f;
         float xCenterOfImg = imgPhotoWidth * 0.8f;
         //if (xCenterOfImg<crSize.Height)
         // xCenterOfImg = (imgPhotoWidth * (1 - (crSize.Height)/ imgPhotoWidth));
         System.Drawing.StringFormat StrFormat = new System.Drawing.StringFormat();
         StrFormat.Alignment = System.Drawing.StringAlignment.Center;
         //
         System.Drawing.SolidBrush semiTransBrush2 = new System.Drawing.SolidBrush(Color.FromArgb(Alpha, 0, 0, 0));
         gbmPhoto.DrawString(
            TextFont
         , crFont
         , semiTransBrush2
         , new System.Drawing.PointF(xCenterOfImg + 1, yPosFromBottom + 1)
         , StrFormat
         );
         System.Drawing.SolidBrush semiTransBrush = new System.Drawing.SolidBrush(Color.FromArgb(Alpha, 255, 255, 255));
         //gbmPhoto.FillRectangle(semiTransBrush2, new RectangleF(new PointF(xCenterOfImg - crSize.Width / 2, yPosFromBottom - 4), crSize));
         gbmPhoto.DrawString(
            TextFont
         , crFont
         , semiTransBrush
         , new System.Drawing.PointF(xCenterOfImg, yPosFromBottom)
         , StrFormat
         );
         bmPhoto.Save(sImgPath, System.Drawing.Imaging.ImageFormat.Jpeg);
         gbmPhoto.Dispose();
         imgPhoto.Dispose();
         bmPhoto.Dispose();
         return true;
      }
      catch
      {
         return false;
      }
}
/**//// <summary>
      /// 文字和Logo图片水印
      /// </summary>
      /// <param name="ImgFile">原图文件地址</param>
      /// <param name="WaterImg">水印图片地址</param>
      /// <param name="TextFont">水印文字信息</param>
      /// <param name="sImgPath">生存水印图片后的保存地址</param>
      /// <param name="ImgAlpha">水印图片的透明度</param>
      /// <param name="imgiScale">水印图片在原图上的显示比例</param>
      /// <param name="intimgDistance">水印图片在原图上的边距确定,以图片的右边和下边为准,当设定的边距超过一定大小后参数会自动失效</param>
      /// <param name="texthScale">水印文字高度位置,从图片底部开始计算，0－1</param>
      /// <param name="textwidthFont">文字块在图片中所占宽度比例 0－1</param>
      /// <param name="textAlpha">文字透明度其数值的范围在0到255</param>
public void zzsImgTextWater(
   string ImgFile
   , string WaterImg
   , string TextFont
   , string sImgPath
   , float ImgAlpha
   , float imgiScale
   , int intimgDistance
   , float texthScale
   , float textwidthFont
   , int textAlpha
   )
{
      try
      {
         FileStream fs = new FileStream(ImgFile, FileMode.Open);
         BinaryReader br = new BinaryReader(fs);
         byte[] bytes = br.ReadBytes((int)fs.Length);
         br.Close();
         fs.Close();
         MemoryStream ms = new MemoryStream(bytes);
         System.Drawing.Image imgPhoto = System.Drawing.Image.FromStream(ms);
         //System.Drawing.Image imgPhoto = System.Drawing.Image.FromFile(ImgFile);
         int imgPhotoWidth = imgPhoto.Width;
         int imgPhotoHeight = imgPhoto.Height;
         Bitmap bmPhoto = new Bitmap(imgPhotoWidth, imgPhotoHeight, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
         bmPhoto.SetResolution(72, 72);
         Graphics gbmPhoto = Graphics.FromImage(bmPhoto);
         gbmPhoto.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
         gbmPhoto.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
         gbmPhoto.DrawImage(
            imgPhoto
         , new Rectangle(0, 0, imgPhotoWidth, imgPhotoHeight)
         , 0
         , 0
         , imgPhotoWidth
         , imgPhotoHeight
         , GraphicsUnit.Pixel
         );
         //建立字体大小的数组,循环找出适合图片的水印字体
         int[] sizes = new int[] { 1000, 800, 700, 650, 600, 560, 540, 500, 450, 400, 380, 360, 340, 320, 300, 280, 260, 240, 220, 200, 180, 160, 140, 120, 100, 80, 72, 64, 48, 32, 28, 26, 24, 20, 28, 16, 14, 12, 10, 8, 6, 4, 2 };
         System.Drawing.Font crFont = null;
         System.Drawing.SizeF crSize = new SizeF();
         for (int i = 0; i < 43; i++)
         {
            crFont = new Font("arial", sizes, FontStyle.Bold);
            crSize = gbmPhoto.MeasureString(TextFont, crFont);
            if ((ushort)crSize.Width < (ushort)imgPhotoWidth * textwidthFont)
                  break;
         }
         //设置水印字体的位置
         int yPixlesFromBottom = (int)(imgPhotoHeight * texthScale);
         float yPosFromBottom = ((imgPhotoHeight - yPixlesFromBottom) - (crSize.Height / 2));
         float xCenterOfImg = (imgPhotoWidth * 1 / 2);
         System.Drawing.StringFormat StrFormat = new System.Drawing.StringFormat();
         StrFormat.Alignment = System.Drawing.StringAlignment.Center;
         //
         System.Drawing.SolidBrush semiTransBrush2 = new System.Drawing.SolidBrush(Color.FromArgb(textAlpha, 0, 0, 0));
         gbmPhoto.DrawString(
            TextFont
         , crFont
         , semiTransBrush2
         , new System.Drawing.PointF(xCenterOfImg + 1, yPosFromBottom + 1)
         , StrFormat
         );
         System.Drawing.SolidBrush semiTransBrush = new System.Drawing.SolidBrush(Color.FromArgb(textAlpha, 255, 255, 255));
         gbmPhoto.DrawString(
            TextFont
         , crFont
         , semiTransBrush
         , new System.Drawing.PointF(xCenterOfImg, yPosFromBottom)
         , StrFormat
         );
         System.Drawing.Image imgWatermark = new Bitmap(WaterImg);
         int imgWatermarkWidth = imgWatermark.Width;
         int imgWatermarkHeight = imgWatermark.Height;
         //计算水印图片尺寸
         decimal aScale = Convert.ToDecimal(imgiScale);
         decimal pScale = 0.05M;
         decimal MinScale = aScale - pScale;
         decimal MaxScale = aScale + pScale;
         int imgWatermarkWidthNew = imgWatermarkWidth;
         int imgWatermarkHeightNew = imgWatermarkHeight;
         if (imgPhotoWidth >= imgWatermarkWidth && imgPhotoHeight >= imgWatermarkHeight && imgPhotoWidth >= imgPhotoHeight)
            if (imgWatermarkWidth > imgWatermarkHeight)
                  if ((MinScale <= Math.Round((Convert.ToDecimal(imgWatermarkWidth) / Convert.ToDecimal(imgPhotoWidth)), 7)) && (Math.Round((Convert.ToDecimal(imgWatermarkWidth) / Convert.ToDecimal(imgPhotoWidth)), 7) <= MaxScale))
                  {
                  }
                  else
                  {
                     imgWatermarkWidthNew = Convert.ToInt32(imgPhotoWidth * aScale);
                     imgWatermarkHeightNew = Convert.ToInt32((imgPhotoWidth * aScale / imgWatermarkWidth) * imgWatermarkHeight);
                  }
            else
               if ((MinScale <= Math.Round((Convert.ToDecimal(imgWatermarkHeight) / Convert.ToDecimal(imgPhotoHeight)), 7)) && (Math.Round((Convert.ToDecimal(imgWatermarkHeight) / Convert.ToDecimal(imgPhotoHeight)), 7) <= MaxScale))
            {
            }
            else
            {
                  imgWatermarkHeightNew = Convert.ToInt32(imgPhotoHeight * aScale);
                  imgWatermarkWidthNew = Convert.ToInt32((imgPhotoHeight * aScale / imgWatermarkHeight) * imgWatermarkWidth);
            }
         if (imgWatermarkWidth >= imgPhotoWidth && imgWatermarkHeight >= imgPhotoHeight && imgWatermarkWidth >= imgWatermarkHeight)
         {
            imgWatermarkWidthNew = Convert.ToInt32(imgPhotoWidth * aScale);
            imgWatermarkHeightNew = Convert.ToInt32(((imgPhotoWidth * aScale) / imgWatermarkWidth) * imgWatermarkHeight);
         }
         if (imgWatermarkWidth >= imgPhotoWidth && imgWatermarkHeight <= imgPhotoHeight && imgPhotoWidth >= imgPhotoHeight)
         {
            imgWatermarkWidthNew = Convert.ToInt32(imgPhotoWidth * aScale);
            imgWatermarkHeightNew = Convert.ToInt32(((imgPhotoWidth * aScale) / imgWatermarkWidth) * imgWatermarkHeight);
         }
         if (imgWatermarkWidth <= imgPhotoWidth && imgWatermarkHeight >= imgPhotoHeight && imgPhotoWidth >= imgPhotoHeight)
         {
            imgWatermarkHeightNew = Convert.ToInt32(imgPhotoHeight * aScale);
            imgWatermarkWidthNew = Convert.ToInt32(((imgPhotoHeight * aScale) / imgWatermarkHeight) * imgWatermarkWidth);
         }
         if (imgPhotoWidth >= imgWatermarkWidth && imgPhotoHeight >= imgWatermarkHeight && imgPhotoWidth <= imgPhotoHeight)
            if (imgWatermarkWidth > imgWatermarkHeight)
                  if ((MinScale <= Math.Round((Convert.ToDecimal(imgWatermarkWidth) / Convert.ToDecimal(imgPhotoWidth)), 7)) && (Math.Round((Convert.ToDecimal(imgWatermarkWidth) / Convert.ToDecimal(imgPhotoWidth)), 7) <= MaxScale))
                  {
                  }
                  else
                  {
                     imgWatermarkWidthNew = Convert.ToInt32(imgPhotoWidth * aScale);
                     imgWatermarkHeightNew = Convert.ToInt32(((imgPhotoWidth * aScale) / imgWatermarkWidth) * imgWatermarkHeight);
                  }
            else
               if ((MinScale <= Math.Round((Convert.ToDecimal(imgWatermarkHeight) / Convert.ToDecimal(imgPhotoHeight)), 7)) && (Math.Round((Convert.ToDecimal(imgWatermarkHeight) / Convert.ToDecimal(imgPhotoHeight)), 7) <= MaxScale))
            {
            }
            else
            {
                  imgWatermarkHeightNew = Convert.ToInt32(imgPhotoHeight * aScale);
                  imgWatermarkWidthNew = Convert.ToInt32(((imgPhotoHeight * aScale) / imgWatermarkHeight) * imgWatermarkWidth);
            }
         if (imgWatermarkWidth >= imgPhotoWidth && imgWatermarkHeight >= imgPhotoHeight && imgWatermarkWidth <= imgWatermarkHeight)
         {
            imgWatermarkHeightNew = Convert.ToInt32(imgPhotoHeight * aScale);
            imgWatermarkWidthNew = Convert.ToInt32(((imgPhotoHeight * aScale) / imgWatermarkHeight) * imgWatermarkWidth);
         }
         if (imgWatermarkWidth >= imgPhotoWidth && imgWatermarkHeight <= imgPhotoHeight && imgPhotoWidth <= imgPhotoHeight)
         {
            imgWatermarkWidthNew = Convert.ToInt32(imgPhotoWidth * aScale);
            imgWatermarkHeightNew = Convert.ToInt32(((imgPhotoWidth * aScale) / imgWatermarkWidth) * imgWatermarkHeight);
         }
         if (imgWatermarkWidth <= imgPhotoWidth && imgWatermarkHeight >= imgPhotoHeight && imgPhotoWidth <= imgPhotoHeight)
         {
            imgWatermarkHeightNew = Convert.ToInt32(imgPhotoHeight * aScale);
            imgWatermarkWidthNew = Convert.ToInt32(((imgPhotoHeight * aScale) / imgWatermarkHeight) * imgWatermarkWidth);
         }
         //将原图画出来
         Bitmap bmWatermark = new Bitmap(bmPhoto);
         bmWatermark.SetResolution(imgPhoto.HorizontalResolution, imgPhoto.VerticalResolution);
         Graphics gWatermark = Graphics.FromImage(bmWatermark);
         //指定高质量显示水印图片质量
         gWatermark.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
         gWatermark.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
         System.Drawing.Imaging.ImageAttributes imageAttributes = new System.Drawing.Imaging.ImageAttributes();
         //设置两种颜色,达到合成效果
         System.Drawing.Imaging.ColorMap colorMap = new System.Drawing.Imaging.ColorMap();
         colorMap.OldColor = Color.FromArgb(255, 0, 255, 0);
         colorMap.NewColor = Color.FromArgb(0, 0, 0, 0);
         System.Drawing.Imaging.ColorMap[] remapTable = { colorMap };
         imageAttributes.SetRemapTable(remapTable, System.Drawing.Imaging.ColorAdjustType.Bitmap);
         //用矩阵设置水印图片透明度
         float[][] colorMatrixElements = {
new float[] {1.0f, 0.0f, 0.0f, 0.0f, 0.0f},
new float[] {0.0f, 1.0f, 0.0f, 0.0f, 0.0f},
new float[] {0.0f, 0.0f, 1.0f, 0.0f, 0.0f},
new float[] {0.0f, 0.0f, 0.0f, ImgAlpha, 0.0f},
new float[] {0.0f, 0.0f, 0.0f, 0.0f, 1.0f}
};
         System.Drawing.Imaging.ColorMatrix wmColorMatrix = new System.Drawing.Imaging.ColorMatrix(colorMatrixElements);
         imageAttributes.SetColorMatrix(wmColorMatrix, System.Drawing.Imaging.ColorMatrixFlag.Default, System.Drawing.Imaging.ColorAdjustType.Bitmap);
         //确定水印边距
         int xPos = imgPhotoWidth - imgWatermarkWidthNew;
         int yPos = imgPhotoHeight - imgWatermarkHeightNew;
         int xPosOfWm = 0;
         int yPosOfWm = 0;
         if (xPos > intimgDistance)
            xPosOfWm = xPos - intimgDistance;
         else
            xPosOfWm = xPos;
         if (yPos > intimgDistance)
            yPosOfWm = yPos - intimgDistance;
         else
            yPosOfWm = yPos;
         gWatermark.DrawImage(
            imgWatermark
         , new Rectangle(xPosOfWm, yPosOfWm, imgWatermarkWidthNew, imgWatermarkHeightNew)
         , 0
         , 0
         , imgWatermarkWidth
         , imgWatermarkHeight
         , GraphicsUnit.Pixel
         , imageAttributes
         );
         imgPhoto = bmWatermark;
         //以jpg格式保存图片
         imgPhoto.Save(sImgPath, System.Drawing.Imaging.ImageFormat.Jpeg);
         //销毁对象
         gbmPhoto.Dispose();
         gWatermark.Dispose();
         bmPhoto.Dispose();
         imgPhoto.Dispose();
         imgWatermark.Dispose();
      }
      catch
      {
      }
}
/**//// <summary>
      /// 缩略图
      /// </summary>
      /// <param name="ImgFile">原图文件地址</param>
      /// <param name="sImgPath">缩略图保存地址</param>
      /// <param name="ResizeWidth">缩略图宽度</param>
      /// <param name="ResizeHeight">缩略图高度</param>
      /// <param name="BgColor">缩略图背景颜色,注意,背景颜色只能指定KnownColor中的值,如blue,red,green等</param>
public bool zzsResizeImg(string ImgFile, string sImgPath, int ResizeWidth, int ResizeHeight, string BgColor)
{
      try
      {
         FileStream fs = new FileStream(ImgFile, FileMode.Open);
         BinaryReader br = new BinaryReader(fs);
         byte[] bytes = br.ReadBytes((int)fs.Length);
         br.Close();
         fs.Close();
         MemoryStream ms = new MemoryStream(bytes);
         System.Drawing.Image imgPhoto = System.Drawing.Image.FromStream(ms);
         //System.Drawing.Image imgPhoto = System.Drawing.Image.FromFile(ImgFile);
         int imgPhotoWidth = imgPhoto.Width;
         int imgPhotoHeight = imgPhoto.Height;
         int startX = 0;
         int StartY = 0;
         int NewWidth = 0;
         int NewHeight = 0;
         if (imgPhotoWidth >= ResizeWidth && imgPhotoHeight >= ResizeHeight)
         {
            NewWidth = ResizeWidth;
            NewHeight = Convert.ToInt32(imgPhotoHeight * Math.Round(Convert.ToDecimal(ResizeWidth) / Convert.ToDecimal(imgPhotoWidth), 10));
            startX = 0;
            StartY = (ResizeHeight - NewHeight) / 2;
         }
         if (ResizeWidth > imgPhotoWidth && ResizeHeight < imgPhotoHeight)
         {
            NewHeight = ResizeHeight;
            NewWidth = Convert.ToInt32(imgPhotoWidth * Math.Round(Convert.ToDecimal(ResizeHeight) / Convert.ToDecimal(imgPhotoHeight), 10));
            startX = (ResizeWidth - NewWidth) / 2;
            StartY = 0;
         }
         if (ResizeWidth < imgPhotoWidth && ResizeHeight > imgPhotoHeight)
         {
            NewWidth = ResizeWidth;
            NewHeight = Convert.ToInt32(imgPhotoHeight * Math.Round(Convert.ToDecimal(ResizeWidth) / Convert.ToDecimal(imgPhotoWidth), 10));
            startX = 0;
            StartY = (ResizeHeight - NewHeight) / 2;
         }
         if (imgPhotoWidth < ResizeWidth && imgPhotoHeight < ResizeHeight)
         {
            NewWidth = imgPhotoWidth;
            NewHeight = imgPhotoHeight;
            startX = (ResizeWidth - imgPhotoWidth) / 2;
            StartY = (ResizeHeight - imgPhotoHeight) / 2;
         }
         //计算缩放图片尺寸
         Bitmap bmPhoto = new Bitmap(ResizeWidth, ResizeHeight, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
         bmPhoto.SetResolution(72, 72);
         Graphics gbmPhoto = Graphics.FromImage(bmPhoto);
         gbmPhoto.Clear(Color.FromName(BgColor));
         gbmPhoto.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
         gbmPhoto.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
         gbmPhoto.DrawImage(
            imgPhoto
         , new Rectangle(startX, StartY, NewWidth, NewHeight)
         , new Rectangle(0, 0, imgPhotoWidth, imgPhotoHeight)
         , GraphicsUnit.Pixel
         );
         bmPhoto.Save(sImgPath, System.Drawing.Imaging.ImageFormat.Jpeg);
         imgPhoto.Dispose();
         gbmPhoto.Dispose();
         bmPhoto.Dispose();
         ms.Close();
         return true;
      }
      catch
      {
         return false;
      }
}
/**//// <summary>
      /// 图片剪切
      /// </summary>
      /// <param name="ImgFile">原图文件地址</param>
      /// <param name="sImgPath">缩略图保存地址</param>
      /// <param name="PointX">剪切起始点 X坐标</param>
      /// <param name="PointY">剪切起始点 Y坐标</param>
      /// <param name="CutWidth">剪切宽度</param>
      /// <param name="CutHeight">剪切高度</param>
public bool zzsCutImg(string ImgFile, string sImgPath, int PointX, int PointY, int CutWidth, int CutHeight)
{
      FileStream fs = new FileStream(ImgFile, FileMode.Open);
      BinaryReader br = new BinaryReader(fs);
      try
      {
         byte[] bytes = br.ReadBytes((int)fs.Length);
         br.Close();
         fs.Close();
         MemoryStream ms = new MemoryStream(bytes);
         System.Drawing.Image imgPhoto = System.Drawing.Image.FromStream(ms);
         //System.Drawing.Image imgPhoto = System.Drawing.Image.FromFile(ImgFile);
         //此处只能用filestream，用 System.Drawing.Image则会报多过进程访问文件的错误，会锁定文件
         Bitmap bmPhoto = new Bitmap(CutWidth, CutHeight, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
         bmPhoto.SetResolution(72, 72);
         Graphics gbmPhoto = Graphics.FromImage(bmPhoto);
         gbmPhoto.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
         gbmPhoto.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
         gbmPhoto.DrawImage(
            imgPhoto
         , new Rectangle(0, 0, CutWidth, CutHeight)
         , new Rectangle(PointX, PointY, CutHeight, CutHeight)
         , GraphicsUnit.Pixel
         );
         bmPhoto.Save(sImgPath, System.Drawing.Imaging.ImageFormat.Jpeg);
         imgPhoto.Dispose();
         gbmPhoto.Dispose();
         bmPhoto.Dispose();
         ms.Close();
         return true;
      }
      catch
      {
         return false;
      }
      finally
      {
      }
}
}

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