C# ASP.NET MVC 图片盗链加水印的问题

素颜马尾好姑娘i 2022-07-15 23:10 157阅读 0赞

[C\# ASP.NET MVC 图片盗链 加水印 的问题][C_ ASP.NET MVC _ _]

ImageClass

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![复制代码][copycode.gif]

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 = 0;
                int y = 0;
                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 = 0;
                            x = (originalImage.Width - ow) / 2;
                        }
                        else
                        {
                            ow = originalImage.Width;
                            oh = originalImage.Width * height / towidth;
                            x = 0;
                            y = (originalImage.Height - oh) / 2;
                        }
                        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(0, 0, 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[0].ToString()), int.Parse(loca[1].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 = 0;
                int y = 0;
    
                if (location == "LT")
                {
                    x = 10;
                    y = 10;
                }
                else if (location == "T")
                {
                    x = img.Width / 2 - waterimg.Width / 2;
                    y = img.Height - waterimg.Height;
                }
                else if (location == "RT")
                {
                    x = img.Width - waterimg.Width;
                    y = 10;
                }
                else if (location == "LC")
                {
                    x = 10;
                    y = img.Height / 2 - waterimg.Height / 2;
                }
                else if (location == "C")
                {
                    x = img.Width / 2 - waterimg.Width / 2;
                    y = img.Height / 2 - waterimg.Height / 2;
                }
                else if (location == "RC")
                {
                    x = img.Width - waterimg.Width;
                    y = img.Height / 2 - waterimg.Height / 2;
                }
                else if (location == "LB")
                {
                    x = 10;
                    y = img.Height - waterimg.Height;
                }
                else if (location == "B")
                {
                    x = img.Width / 2 - waterimg.Width / 2;
                    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[0].ToString()), float.Parse(loca[1].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 = 10;
                float y = 10;
    
                if (location == "LT")
                {
                    loca.Add(x);
                    loca.Add(y);
                }
                else if (location == "T")
                {
                    x = img.Width / 2 - (width * height) / 2;
                    loca.Add(x);
                    loca.Add(y);
                }
                else if (location == "RT")
                {
                    x = img.Width - width * height;
                }
                else if (location == "LC")
                {
                    y = img.Height / 2;
                }
                else if (location == "C")
                {
                    x = img.Width / 2 - (width * height) / 2;
                    y = img.Height / 2;
                }
                else if (location == "RC")
                {
                    x = img.Width - height;
                    y = img.Height / 2;
                }
                else if (location == "LB")
                {
                    y = img.Height - width - 5;
                }
                else if (location == "B")
                {
                    x = img.Width / 2 - (width * height) / 2;
                    y = img.Height - width - 5;
                }
                else
                {
                    x = img.Width - width * height;
                    y = img.Height - width - 5;
                }
                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 = 0; x < width; x++)
                {
                    for (y = 0; 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 = 0; x < width; x++)
                {
                    for (y = 0; y < height; y++)
                    {
                        pixel = mybm.GetPixel(x, y);//获取当前坐标的像素值
                        resultR = 255 - pixel.R;//反红
                        resultG = 255 - pixel.G;//反绿
                        resultB = 255 - 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 = 0; x < Width - 1; x++)
                {
                    for (int y = 0; y < Height - 1; y++)
                    {
                        int r = 0, g = 0, b = 0;
                        color1 = oldBitmap.GetPixel(x, y);
                        color2 = oldBitmap.GetPixel(x + 1, y + 1);
                        r = Math.Abs(color1.R - color2.R + 128);
                        g = Math.Abs(color1.G - color2.G + 128);
                        b = Math.Abs(color1.B - color2.B + 128);
                        if (r > 255) r = 255;
                        if (r < 0) r = 0;
                        if (g > 255) g = 255;
                        if (g < 0) g = 0;
                        if (b > 255) b = 255;
                        if (b < 0) b = 0;
                        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(0, 0, newW, newH), new Rectangle(0, 0, 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 = 0; x < width; x++)
                {
                    for (y = 0; y < height; y++)
                    {
                        pixel = mybm.GetPixel(x, y);//获取当前坐标的像素值
                        bm.SetPixel(x, y, Color.FromArgb(0, 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 - 1; y >= 0; y--)
                {
                    for (x = width - 1, z = 0; x >= 0; 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 = 0; x < width; x++)
                {
                    for (y = height - 1, z = 0; y >= 0; 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(100, 125);
                    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(0, 0, newSize.Width, newSize.Height), 0, 0, img.Width, img.Height, GraphicsUnit.Pixel);
                    g.Dispose();
                    EncoderParameters encoderParams = new EncoderParameters();
                    long[] quality = new long[1];
                    quality[0] = 100;
                    EncoderParameter encoderParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, quality);
                    encoderParams.Param[0] = encoderParam;
                    ImageCodecInfo[] arrayICI = ImageCodecInfo.GetImageEncoders();
                    ImageCodecInfo jpegICI = null;
                    for (int x = 0; 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 = 0; x < width; x++)
                {
                    for (y = 0; 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) / 3;//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[0]);
                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 = 0; i < count; i++)    //以Jpeg格式保存各帧
                {
                    gif.SelectActiveFrame(fd, i);
                    gif.Save(pSavedPath + "\\frame_" + i + ".jpg", ImageFormat.Jpeg);
                }
            }
            #endregion
        }
    }

![复制代码][copycode.gif]

传智的例子

![复制代码][copycode.gif]

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(300,400))
                {
                    //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(150,200));
    
                        //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;
                }
            }
        }
    }

![复制代码][copycode.gif]

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", 10);
                            System.Drawing.Brush brushWater = new SolidBrush(Color.White);
                            gWater.DrawString(waterText, fontWater, brushWater, 10, 10);
                            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(255, 0, 255, 0);
                                    colorMap.NewColor = Color.FromArgb(0, 0, 0, 0);
                                    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), 0, 0, 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(0, 0, newImage.Width, newImage.Height), new System.Drawing.Rectangle(0, 0, 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", 10);
                            System.Drawing.Brush brushWater = new SolidBrush(Color.White);
                            gWater.DrawString(waterText, fontWater, brushWater, 10, 10);
                            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(255, 0, 255, 0);
                                    colorMap.NewColor = Color.FromArgb(0, 0, 0, 0);
                                    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), 0, 0, 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();
                }
            }

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