C# ASP.NET MVC 图片盗链 加水印 的问题

ImageClass

using System;
using System.Collections;
using System.IO;
using System.Drawing;
using System.Drawing.Imaging;
using System.Drawing.Drawing2D;

namespace CZBK.ItcastProject.Common
{
    public class ImageClass
    {
        public ImageClass()
        { }

        #region 缩略图
        /// <summary>
        /// 生成缩略图
        /// </summary>
        /// <param name="originalImagePath">源图路径（物理路径）</param>
        /// <param name="thumbnailPath">缩略图路径（物理路径）</param>
        /// <param name="width">缩略图宽度</param>
        /// <param name="height">缩略图高度</param>
        /// <param name="mode">生成缩略图的方式</param>
        public static void MakeThumbnail(string originalImagePath, string thumbnailPath, int width, int height, string mode)
        {
            System.Drawing.Image originalImage = System.Drawing.Image.FromFile(originalImagePath);

            int towidth = width;
            int toheight = height;

            int x = ;
            int y = ;
            int ow = originalImage.Width;
            int oh = originalImage.Height;

            switch (mode)
            {
                case "HW":  //指定高宽缩放（可能变形）
                    break;
                case "W":   //指定宽，高按比例
                    toheight = originalImage.Height * width / originalImage.Width;
                    break;
                case "H":   //指定高，宽按比例
                    towidth = originalImage.Width * height / originalImage.Height;
                    break;
                case "Cut": //指定高宽裁减（不变形）
                    if ((double)originalImage.Width / (double)originalImage.Height > (double)towidth / (double)toheight)
                    {
                        oh = originalImage.Height;
                        ow = originalImage.Height * towidth / toheight;
                        y = ;
                        x = (originalImage.Width - ow) / ;
                    }
                    else
                    {
                        ow = originalImage.Width;
                        oh = originalImage.Width * height / towidth;
                        x = ;
                        y = (originalImage.Height - oh) / ;
                    }
                    break;
                default:
                    break;
            }

            //新建一个bmp图片
            System.Drawing.Image bitmap = new System.Drawing.Bitmap(towidth, toheight);

            //新建一个画板
            System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap);

            //设置高质量插值法
            g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;

            //设置高质量,低速度呈现平滑程度
            g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;

            //清空画布并以透明背景色填充
            g.Clear(System.Drawing.Color.Transparent);

            //在指定位置并且按指定大小绘制原图片的指定部分
            //第一个：对哪张图片进行操作。
            //二：画多么大。
            //三：画那块区域。
            g.DrawImage(originalImage, new System.Drawing.Rectangle(, , towidth, toheight), new System.Drawing.Rectangle(x, y, ow, oh), System.Drawing.GraphicsUnit.Pixel);

            try
            {
                //以jpg格式保存缩略图
                bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg);
            }
            catch (System.Exception e)
            {
                throw e;
            }
            finally
            {
                originalImage.Dispose();
                bitmap.Dispose();
                g.Dispose();
            }
        }
        #endregion

        #region 图片水印
        /// <summary>
        /// 图片水印处理方法
        /// </summary>
        /// <param name="path">需要加载水印的图片路径（绝对路径）</param>
        /// <param name="waterpath">水印图片（绝对路径）</param>
        /// <param name="location">水印位置（传送正确的代码）</param>
        public static string ImageWatermark(string path, string waterpath, string location)
        {
            string kz_name = Path.GetExtension(path);
            if (kz_name == ".jpg" || kz_name == ".bmp" || kz_name == ".jpeg")
            {
                DateTime time = DateTime.Now;
                string filename = "" + time.Year.ToString() + time.Month.ToString() + time.Day.ToString() + time.Hour.ToString() + time.Minute.ToString() + time.Second.ToString() + time.Millisecond.ToString();
                Image img = Bitmap.FromFile(path);
                Image waterimg = Image.FromFile(waterpath);
                Graphics g = Graphics.FromImage(img);
                ArrayList loca = GetLocation(location, img, waterimg);
                g.DrawImage(waterimg, new Rectangle(int.Parse(loca[].ToString()), int.Parse(loca[].ToString()), waterimg.Width, waterimg.Height));
                waterimg.Dispose();
                g.Dispose();
                string newpath = Path.GetDirectoryName(path) + filename + kz_name;
                img.Save(newpath);
                img.Dispose();
                File.Copy(newpath, path, true);
                if (File.Exists(newpath))
                {
                    File.Delete(newpath);
                }
            }
            return path;
        }

        /// <summary>
        /// 图片水印位置处理方法
        /// </summary>
        /// <param name="location">水印位置</param>
        /// <param name="img">需要添加水印的图片</param>
        /// <param name="waterimg">水印图片</param>
        private static ArrayList GetLocation(string location, Image img, Image waterimg)
        {
            ArrayList loca = new ArrayList();
            int x = ;
            int y = ;

            if (location == "LT")
            {
                x = ;
                y = ;
            }
            else if (location == "T")
            {
                x = img.Width /  - waterimg.Width / ;
                y = img.Height - waterimg.Height;
            }
            else if (location == "RT")
            {
                x = img.Width - waterimg.Width;
                y = ;
            }
            else if (location == "LC")
            {
                x = ;
                y = img.Height /  - waterimg.Height / ;
            }
            else if (location == "C")
            {
                x = img.Width /  - waterimg.Width / ;
                y = img.Height /  - waterimg.Height / ;
            }
            else if (location == "RC")
            {
                x = img.Width - waterimg.Width;
                y = img.Height /  - waterimg.Height / ;
            }
            else if (location == "LB")
            {
                x = ;
                y = img.Height - waterimg.Height;
            }
            else if (location == "B")
            {
                x = img.Width /  - waterimg.Width / ;
                y = img.Height - waterimg.Height;
            }
            else
            {
                x = img.Width - waterimg.Width;
                y = img.Height - waterimg.Height;
            }
            loca.Add(x);
            loca.Add(y);
            return loca;
        }
        #endregion

        #region 文字水印
        /// <summary>
        /// 文字水印处理方法
        /// </summary>
        /// <param name="path">图片路径（绝对路径）</param>
        /// <param name="size">字体大小</param>
        /// <param name="letter">水印文字</param>
        /// <param name="color">颜色</param>
        /// <param name="location">水印位置</param>
        public static string LetterWatermark(string path, int size, string letter, Color color, string location)
        {
            #region

            string kz_name = Path.GetExtension(path);
            if (kz_name == ".jpg" || kz_name == ".bmp" || kz_name == ".jpeg")
            {
                DateTime time = DateTime.Now;
                string filename = "" + time.Year.ToString() + time.Month.ToString() + time.Day.ToString() + time.Hour.ToString() + time.Minute.ToString() + time.Second.ToString() + time.Millisecond.ToString();
                Image img = Bitmap.FromFile(path);
                Graphics gs = Graphics.FromImage(img);
                ArrayList loca = GetLocation(location, img, size, letter.Length);
                Font font = new Font("宋体", size);
                Brush br = new SolidBrush(color);
                gs.DrawString(letter, font, br, float.Parse(loca[].ToString()), float.Parse(loca[].ToString()));
                gs.Dispose();
                string newpath = Path.GetDirectoryName(path) + filename + kz_name;
                img.Save(newpath);
                img.Dispose();
                File.Copy(newpath, path, true);
                if (File.Exists(newpath))
                {
                    File.Delete(newpath);
                }
            }
            return path;

            #endregion
        }

        /// <summary>
        /// 文字水印位置的方法
        /// </summary>
        /// <param name="location">位置代码</param>
        /// <param name="img">图片对象</param>
        /// <param name="width">宽(当水印类型为文字时,传过来的就是字体的大小)</param>
        /// <param name="height">高(当水印类型为文字时,传过来的就是字符的长度)</param>
        private static ArrayList GetLocation(string location, Image img, int width, int height)
        {
            #region

            ArrayList loca = new ArrayList();  //定义数组存储位置
            float x = ;
            float y = ;

            if (location == "LT")
            {
                loca.Add(x);
                loca.Add(y);
            }
            else if (location == "T")
            {
                x = img.Width /  - (width * height) / ;
                loca.Add(x);
                loca.Add(y);
            }
            else if (location == "RT")
            {
                x = img.Width - width * height;
            }
            else if (location == "LC")
            {
                y = img.Height / ;
            }
            else if (location == "C")
            {
                x = img.Width /  - (width * height) / ;
                y = img.Height / ;
            }
            else if (location == "RC")
            {
                x = img.Width - height;
                y = img.Height / ;
            }
            else if (location == "LB")
            {
                y = img.Height - width - ;
            }
            else if (location == "B")
            {
                x = img.Width /  - (width * height) / ;
                y = img.Height - width - ;
            }
            else
            {
                x = img.Width - width * height;
                y = img.Height - width - ;
            }
            loca.Add(x);
            loca.Add(y);
            return loca;

            #endregion
        }
        #endregion

        #region 调整光暗
        /// <summary>
        /// 调整光暗
        /// </summary>
        /// <param name="mybm">原始图片</param>
        /// <param name="width">原始图片的长度</param>
        /// <param name="height">原始图片的高度</param>
        /// <param name="val">增加或减少的光暗值</param>
        public Bitmap LDPic(Bitmap mybm, int width, int height, int val)
        {
            Bitmap bm = new Bitmap(width, height);//初始化一个记录经过处理后的图片对象
            int x, y, resultR, resultG, resultB;//x、y是循环次数，后面三个是记录红绿蓝三个值的
            Color pixel;
            for (x = ; x < width; x++)
            {
                for (y = ; y < height; y++)
                {
                    pixel = mybm.GetPixel(x, y);//获取当前像素的值
                    resultR = pixel.R + val;//检查红色值会不会超出[0, 255]
                    resultG = pixel.G + val;//检查绿色值会不会超出[0, 255]
                    resultB = pixel.B + val;//检查蓝色值会不会超出[0, 255]
                    bm.SetPixel(x, y, Color.FromArgb(resultR, resultG, resultB));//绘图
                }
            }
            return bm;
        }
        #endregion

        #region 反色处理
        /// <summary>
        /// 反色处理
        /// </summary>
        /// <param name="mybm">原始图片</param>
        /// <param name="width">原始图片的长度</param>
        /// <param name="height">原始图片的高度</param>
        public Bitmap RePic(Bitmap mybm, int width, int height)
        {
            Bitmap bm = new Bitmap(width, height);//初始化一个记录处理后的图片的对象
            int x, y, resultR, resultG, resultB;
            Color pixel;
            for (x = ; x < width; x++)
            {
                for (y = ; y < height; y++)
                {
                    pixel = mybm.GetPixel(x, y);//获取当前坐标的像素值
                    resultR =  - pixel.R;//反红
                    resultG =  - pixel.G;//反绿
                    resultB =  - pixel.B;//反蓝
                    bm.SetPixel(x, y, Color.FromArgb(resultR, resultG, resultB));//绘图
                }
            }
            return bm;
        }
        #endregion

        #region 浮雕处理
        /// <summary>
        /// 浮雕处理
        /// </summary>
        /// <param name="oldBitmap">原始图片</param>
        /// <param name="Width">原始图片的长度</param>
        /// <param name="Height">原始图片的高度</param>
        public Bitmap FD(Bitmap oldBitmap, int Width, int Height)
        {
            Bitmap newBitmap = new Bitmap(Width, Height);
            Color color1, color2;
            for (int x = ; x < Width - ; x++)
            {
                for (int y = ; y < Height - ; y++)
                {
                    int r = , g = , b = ;
                    color1 = oldBitmap.GetPixel(x, y);
                    color2 = oldBitmap.GetPixel(x + , y + );
                    r = Math.Abs(color1.R - color2.R + );
                    g = Math.Abs(color1.G - color2.G + );
                    b = Math.Abs(color1.B - color2.B + );
                    if (r > ) r = ;
                    if (r < ) r = ;
                    if (g > ) g = ;
                    if (g < ) g = ;
                    if (b > ) b = ;
                    if (b < ) b = ;
                    newBitmap.SetPixel(x, y, Color.FromArgb(r, g, b));
                }
            }
            return newBitmap;
        }
        #endregion

        #region 拉伸图片
        /// <summary>
        /// 拉伸图片
        /// </summary>
        /// <param name="bmp">原始图片</param>
        /// <param name="newW">新的宽度</param>
        /// <param name="newH">新的高度</param>
        public static Bitmap ResizeImage(Bitmap bmp, int newW, int newH)
        {
            try
            {
                Bitmap bap = new Bitmap(newW, newH);
                Graphics g = Graphics.FromImage(bap);
                g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
                g.DrawImage(bap, new Rectangle(, , newW, newH), new Rectangle(, , bap.Width, bap.Height), GraphicsUnit.Pixel);
                g.Dispose();
                return bap;
            }
            catch
            {
                return null;
            }
        }
        #endregion

        #region 滤色处理
        /// <summary>
        /// 滤色处理
        /// </summary>
        /// <param name="mybm">原始图片</param>
        /// <param name="width">原始图片的长度</param>
        /// <param name="height">原始图片的高度</param>
        public Bitmap FilPic(Bitmap mybm, int width, int height)
        {
            Bitmap bm = new Bitmap(width, height);//初始化一个记录滤色效果的图片对象
            int x, y;
            Color pixel;

            for (x = ; x < width; x++)
            {
                for (y = ; y < height; y++)
                {
                    pixel = mybm.GetPixel(x, y);//获取当前坐标的像素值
                    bm.SetPixel(x, y, Color.FromArgb(, pixel.G, pixel.B));//绘图
                }
            }
            return bm;
        }
        #endregion

        #region 左右翻转
        /// <summary>
        /// 左右翻转
        /// </summary>
        /// <param name="mybm">原始图片</param>
        /// <param name="width">原始图片的长度</param>
        /// <param name="height">原始图片的高度</param>
        public Bitmap RevPicLR(Bitmap mybm, int width, int height)
        {
            Bitmap bm = new Bitmap(width, height);
            int x, y, z; //x,y是循环次数,z是用来记录像素点的x坐标的变化的
            Color pixel;
            for (y = height - ; y >= ; y--)
            {
                for (x = width - , z = ; x >= ; x--)
                {
                    pixel = mybm.GetPixel(x, y);//获取当前像素的值
                    bm.SetPixel(z++, y, Color.FromArgb(pixel.R, pixel.G, pixel.B));//绘图
                }
            }
            return bm;
        }
        #endregion

        #region 上下翻转
        /// <summary>
        /// 上下翻转
        /// </summary>
        /// <param name="mybm">原始图片</param>
        /// <param name="width">原始图片的长度</param>
        /// <param name="height">原始图片的高度</param>
        public Bitmap RevPicUD(Bitmap mybm, int width, int height)
        {
            Bitmap bm = new Bitmap(width, height);
            int x, y, z;
            Color pixel;
            for (x = ; x < width; x++)
            {
                for (y = height - , z = ; y >= ; y--)
                {
                    pixel = mybm.GetPixel(x, y);//获取当前像素的值
                    bm.SetPixel(x, z++, Color.FromArgb(pixel.R, pixel.G, pixel.B));//绘图
                }
            }
            return bm;
        }
        #endregion

        #region 压缩图片
        /// <summary>
        /// 压缩到指定尺寸
        /// </summary>
        /// <param name="oldfile">原文件</param>
        /// <param name="newfile">新文件</param>
        public bool Compress(string oldfile, string newfile)
        {
            try
            {
                System.Drawing.Image img = System.Drawing.Image.FromFile(oldfile);
                System.Drawing.Imaging.ImageFormat thisFormat = img.RawFormat;
                Size newSize = new Size(, );
                Bitmap outBmp = new Bitmap(newSize.Width, newSize.Height);
                Graphics g = Graphics.FromImage(outBmp);
                g.CompositingQuality = CompositingQuality.HighQuality;
                g.SmoothingMode = SmoothingMode.HighQuality;
                g.InterpolationMode = InterpolationMode.HighQualityBicubic;
                g.DrawImage(img, new Rectangle(, , newSize.Width, newSize.Height), , , img.Width, img.Height, GraphicsUnit.Pixel);
                g.Dispose();
                EncoderParameters encoderParams = new EncoderParameters();
                long[] quality = new long[];
                quality[] = ;
                EncoderParameter encoderParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, quality);
                encoderParams.Param[] = encoderParam;
                ImageCodecInfo[] arrayICI = ImageCodecInfo.GetImageEncoders();
                ImageCodecInfo jpegICI = null;
                for (int x = ; x < arrayICI.Length; x++)
                    if (arrayICI[x].FormatDescription.Equals("JPEG"))
                    {
                        jpegICI = arrayICI[x]; //设置JPEG编码
                        break;
                    }
                img.Dispose();
                if (jpegICI != null) outBmp.Save(newfile, System.Drawing.Imaging.ImageFormat.Jpeg);
                outBmp.Dispose();
                return true;
            }
            catch
            {
                return false;
            }
        }
        #endregion

        #region 图片灰度化
        public Color Gray(Color c)
        {
            int rgb = Convert.ToInt32((double)(((0.3 * c.R) + (0.59 * c.G)) + (0.11 * c.B)));
            return Color.FromArgb(rgb, rgb, rgb);
        }
        #endregion

        #region 转换为黑白图片
        /// <summary>
        /// 转换为黑白图片
        /// </summary>
        /// <param name="mybt">要进行处理的图片</param>
        /// <param name="width">图片的长度</param>
        /// <param name="height">图片的高度</param>
        public Bitmap BWPic(Bitmap mybm, int width, int height)
        {
            Bitmap bm = new Bitmap(width, height);
            int x, y, result; //x,y是循环次数，result是记录处理后的像素值
            Color pixel;
            for (x = ; x < width; x++)
            {
                for (y = ; y < height; y++)
                {
                    pixel = mybm.GetPixel(x, y);//获取当前坐标的像素值
                    result = (pixel.R + pixel.G + pixel.B) / ;//取红绿蓝三色的平均值
                    bm.SetPixel(x, y, Color.FromArgb(result, result, result));
                }
            }
            return bm;
        }
        #endregion

        #region 获取图片中的各帧
        /// <summary>
        /// 获取图片中的各帧
        /// </summary>
        /// <param name="pPath">图片路径</param>
        /// <param name="pSavePath">保存路径</param>
        public void GetFrames(string pPath, string pSavedPath)
        {
            Image gif = Image.FromFile(pPath);
            FrameDimension fd = new FrameDimension(gif.FrameDimensionsList[]);
            int count = gif.GetFrameCount(fd); //获取帧数(gif图片可能包含多帧，其它格式图片一般仅一帧)
            for (int i = ; i < count; i++)    //以Jpeg格式保存各帧
            {
                gif.SelectActiveFrame(fd, i);
                gif.Save(pSavedPath + "\\frame_" + i + ".jpg", ImageFormat.Jpeg);
            }
        }
        #endregion
    }
}

传智的例子

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Web;

namespace CZBK.ItcastProject.WebApp._2015_5_27
{
    /// <summary>
    /// MakeImage 的摘要说明
    /// </summary>
    public class MakeImage : IHttpHandler
    {

        public void ProcessRequest(HttpContext context)
        {
            context.Response.ContentType = "text/html";
          //给用户创建一张图片，并且把这张图片保存。
            //创建一个画布.
            using (Bitmap map = new Bitmap(,))
            {
                //给画布创建一个画笔。
                using (Graphics g = Graphics.FromImage(map))
                {
                    g.Clear(Color.Gray);
                    //再画布上写字。

                    //1:写的是什么字
                    //2：字体的样式，字体大小等。
                    //3:用什么颜色填充字体
                    //4:在画布的什么位置写字
                    g.DrawString("传智播客", new Font("黑体", 14.0f, FontStyle.Bold), Brushes.Red, new PointF(,));

                    //将画布保存成一张图片.
                    string fileName = Guid.NewGuid().ToString();
                    //将画布保存成一张图片，并且指定图片的类型
                    map.Save(context.Request.MapPath("/ImageUpload/"+fileName+".jpg"),System.Drawing.Imaging.ImageFormat.Jpeg);
                    context.Response.Write("<html><body><img src='/ImageUpload/"+fileName+".jpg'/></body></html>");
                }
            }

        }

        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
    }
}

 public static void ZoomAuto(System.IO.Stream fromFile, string savePath, System.Double targetWidth, System.Double targetHeight, string waterText, string waterImage,out int NewWidth,out int NewHeight)
        {
            //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 (waterText != "")
                {
                    using (System.Drawing.Graphics gWater = System.Drawing.Graphics.FromImage(initImage))
                    {
                        System.Drawing.Font fontWater = new Font("黑体", );
                        System.Drawing.Brush brushWater = new SolidBrush(Color.White);
                        gWater.DrawString(waterText, fontWater, brushWater, , );
                        gWater.Dispose();
                    }
                }                //透明图片水印
                if (waterImage != "")
                {
                    if (File.Exists(waterImage))
                    {
                        //获取水印图片
                        using (System.Drawing.Image wrImage = System.Drawing.Image.FromFile(waterImage))
                        {
                            //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(, , , );
                                colorMap.NewColor = Color.FromArgb(, , , );
                                ColorMap[] remapTable = { colorMap };
                                imgAttributes.SetRemapTable(remapTable, ColorAdjustType.Bitmap);                                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,  0.5f, 0.0f},//透明度:0.5
                                   new float[] {0.0f,  0.0f,  0.0f,  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.Width, wrImage.Height, GraphicsUnit.Pixel, imgAttributes);                                gWater.Dispose();
                            }
                            wrImage.Dispose();
                        }
                    }
                }
                NewWidth = initImage.Width;
                NewHeight = initImage.Height;
                //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);
                NewWidth = (int)newWidth;
                NewHeight = (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, new System.Drawing.Rectangle(, , newImage.Width, newImage.Height), new System.Drawing.Rectangle(, , initImage.Width, initImage.Height), System.Drawing.GraphicsUnit.Pixel);                //文字水印
                if (waterText != "")
                {
                    using (System.Drawing.Graphics gWater = System.Drawing.Graphics.FromImage(newImage))
                    {
                        System.Drawing.Font fontWater = new Font("宋体", );
                        System.Drawing.Brush brushWater = new SolidBrush(Color.White);
                        gWater.DrawString(waterText, fontWater, brushWater, , );
                        gWater.Dispose();
                    }
                }                //透明图片水印
                if (waterImage != "")
                {
                    if (File.Exists(waterImage))
                    {
                        //获取水印图片
                        using (System.Drawing.Image wrImage = System.Drawing.Image.FromFile(waterImage))
                        {
                            //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(, , , );
                                colorMap.NewColor = Color.FromArgb(, , , );
                                ColorMap[] remapTable = { colorMap };
                                imgAttributes.SetRemapTable(remapTable, ColorAdjustType.Bitmap);                                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,  0.5f, 0.0f},//透明度:0.5
                                   new float[] {0.0f,  0.0f,  0.0f,  0.0f, 1.0f}
                                };                                ColorMatrix wmColorMatrix = new ColorMatrix(colorMatrixElements);
                                imgAttributes.SetColorMatrix(wmColorMatrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap);
                                gWater.DrawImage(wrImage, new Rectangle(newImage.Width - wrImage.Width, newImage.Height - wrImage.Height, wrImage.Width, wrImage.Height), , , wrImage.Width, wrImage.Height, GraphicsUnit.Pixel, imgAttributes);
                                gWater.Dispose();
                            }
                            wrImage.Dispose();
                        }
                    }
                }                //保存缩略图                try {
                    newImage.Save(savePath, System.Drawing.Imaging.ImageFormat.Png);
                }
                catch(Exception ex)
                {
                    throw new Exception("系统出错误了，请重新尝试或者换一张照片");
                }
                                //释放资源
                newG.Dispose();
                newImage.Dispose();
                initImage.Dispose();
            }
        }