• asp.net添加水印图片


    下面是需要加水印的aspx

    View Code
    <html xmlns="http://www.w3.org/1999/xhtml">
    <head runat="server">
        <title></title>
    
        <script type="text/javascript" src="../js/jquery-1.4.2.js"></script>
    
        <script src="http://www.cnblogs.com/js/jquery-1.6.2.min.js" type="text/javascript"></script>
    
        <script src="http://www.cnblogs.com/js/jquery-ui-1.8.2.custom.min.js" type="text/javascript"></script>
    
        <script type="text/javascript">
            $(function() {
                $("#fly").draggable({ cursor: 'move', containment: "#largin", revert: false,
                    stop: function() {
                        $("#<%=HiddenField1.ClientID %>").val($("#fly").css("left"));
                        $("#<%=HiddenField2.ClientID %>").val($("#fly").css("top"));
                    }
                });
                $("#btndown").click(function() {
                    var i = parseFloat($("#<%=HiddenField3.ClientID %>").val()) - parseFloat(0.10);
                    $("#<%=HiddenField3.ClientID %>").val(i);
                    $("#fly").fadeTo(1, i);
                });
                $("#btnup").click(function() {
                    var i = parseFloat($("#<%=HiddenField3.ClientID %>").val()) + parseFloat(0.10);
                    if (i >= "1") {
                        i = "1";
                    }
                    $("#<%=HiddenField3.ClientID %>").val(i);
                    $("#fly").fadeTo(1, i);
                });
    
            });
        </script>
    
    </head>
    <body style="margin: 0px auto">
        <form runat="server">
        <div style="text-align: center;">
            <div style="position: relative;  800px; height: 800px; border: 1px solid">
                <%if (imgModel.WaterImg != null && imgModel.WaterImg != "")
                  { %>
                <img src="http://www.cnblogs.com/Img/watermid/<%=imgModel.WaterImg %>" alt="" style="position: absolute;
                    border: 1px solid" id="fly" />
                <%} %>
                <img src="http://www.cnblogs.com/Img/big/<%=imgModel.ImgName %>" alt="" id="largin" style="border: 1px solid" />
            </div>
            <div>
                <asp:FileUpload ID="FileUpload1" runat="server" />&nbsp;&nbsp;&nbsp;<asp:Button ID="Button1"
                    runat="server" Text="上传" OnClick="Button1_Click" Width="55px" />
                     <%if (imgModel.WaterImg != null && imgModel.WaterImg != "")
              { %>
           
                透明度:<input type="button" id="btndown" value="-" /><input type="button" id="btnup"
                    value="+" />
                <asp:Button ID="BtnUp" runat="server" Text="确定" OnClick="BtnUp_Click" Width="59px" />
                <%} %>
            </div>
           
         
            <asp:HiddenField ID="HiddenField1" runat="server" />
            <asp:HiddenField ID="HiddenField2" runat="server" />
            <asp:HiddenField ID="HiddenField3" runat="server" Value="1.00" />
            
        </div>
        </form>
    </body>
    </html>

    aspx.cs

    View Code
    public partial class Water : System.Web.UI.Page
        {
            Cw100.BLL.CW100_Image imgbll = new Cw100.BLL.CW100_Image();
            public Cw100.Model.CW100_Image imgModel = new Cw100.Model.CW100_Image();
            protected void Page_Load(object sender, EventArgs e)
            {
                if (!IsPostBack)
                {
                    GetImgId();
                }
            }
            private void GetImgId()
            {
                if (Request.QueryString["imgid"] != null)
                {
                    string imgid = Request.QueryString["imgid"];
    
                    imgModel = imgbll.GetModel(Convert.ToInt32(imgid));
                }
            }
    
            protected void BtnUp_Click(object sender, EventArgs e)
            {
                string imgid = Request.QueryString["imgid"];
                string left1 = HiddenField1.Value;
                int i =left1.LastIndexOf( "px");
                string left= left1.Substring(0,i);
    
                string top1 = HiddenField2.Value;
                int j = top1.LastIndexOf("px");
                string top = top1.Substring(0,j);
    
                string color = HiddenField3.Value;
                if (Upload(imgid,left,top,color) == true)
                {
                    Response.Redirect("PicIndex.aspx");
                }
            }
            protected bool Upload(string imgid,string left,string top,string color)
            {
                bool succ = false;
                imgModel = imgbll.GetModel(Convert.ToInt32(imgid));
              
                    //删除原来的图片
                    if (File.Exists(System.Web.HttpContext.Current.Server.MapPath("http://www.cnblogs.com/Img/big/" + imgModel.WaterImgName + "")))
                    {
                        File.Delete(System.Web.HttpContext.Current.Server.MapPath("http://www.cnblogs.com/Img/big/" + imgModel.WaterImgName + ""));
                    }
          string name= Cw100_web.background.PicSpace.WaterImageManage.DrawImage(imgModel.ImgName, imgModel.WaterImg, float.Parse(color),left,top, "~/Img/mid/","~/Img/watermid/","~/Img/big/");
                  imgModel.WaterImgName = name;
                  if (imgbll.Update(imgModel) == true)
                  {
                      succ = true;
                  }
                
                return succ;
            }
    
            protected void Button1_Click(object sender, EventArgs e)
            {
                string imgid = Request.QueryString["imgid"];
                imgModel = imgbll.GetModel(Convert.ToInt32(imgid));
                string filename = string.Empty;
                if (FileUpload1.HasFile != false)
                {
                    filename = FileUpload1.FileName;
                    int i = filename.LastIndexOf(".");
                    string after = filename.Substring(i, filename.Length - i);
                    if (after != ".jpg" && after != ".GPG" && after != ".gif" && after != ".GIF" && after != ".png" && after != ".PNG" && after != ".jpeg" && after != ".JPEG")
                    {
                        System.Web.HttpContext.Current.Response.Write("<script language='javascript'>alert('请选择正确格式的图片文件')</script>");
                    }
                    else
                    {
                        FileUpload1.SaveAs(System.Web.HttpContext.Current.Server.MapPath("http://www.cnblogs.com/Img/watermid/" + filename + ""));
                        imgModel.WaterImg = filename;
                        if (imgbll.Update(imgModel) == true)
                        {
                            Response.Redirect("Water.aspx?imgid=" + imgid);
                        }
                    }
                }
                else
                {
                    ClientScript.RegisterStartupScript(this.GetType(), "", "alert('请选择上传图片');", true);
                }
    
            }
        }
    }

    waterPic类

    View Code
    public enum ImagePosition
        {
            LeftTop,        //左上
            LeftBottom,    //左下
            RightTop,       //右上
            RigthBottom, //右下
            TopMiddle,     //顶部居中
            BottomMiddle, //底部居中
            Center           //中心
        }
        public  class WaterImageManage
        {
            /// <summary>
            /// 生成一个新的水印图片制作实例
            /// </summary>
            public WaterImageManage()
            {
                //
                // TODO: Add constructor logic here
                //
            }
    
            /// <summary>
            /// 添加图片水印
            /// </summary>
            /// <param name="sourcePicture">源图片文件名</param>
            /// <param name="waterImage">水印图片文件名</param>
            /// <param name="alpha">透明度(0.1-1.0数值越小透明度越高)</param>
            /// <param name="position">位置</param>
            /// <param name="PicturePath" >图片的路径</param>
            /// <returns>返回生成于指定文件夹下的水印文件名</returns>
            public static string DrawImage(string sourcePicture, string waterImage, float alpha,string left,string top,string PicturePath,string NewpicPath,string BigwaterPath)
            {
                //
                // 判断参数是否有效
                //
                if (sourcePicture == string.Empty || waterImage == string.Empty || alpha == 0.0 || PicturePath == string.Empty)
                {
                    return sourcePicture;
                }
    
                //
                // 源图片,水印图片全路径
                //
               // 原图片路径
                string sourcePictureName = PicturePath + sourcePicture;
                string sourcepictureName2 = BigwaterPath + sourcePicture;
               
                //水印图片路径
                string waterPictureName = NewpicPath + waterImage;
    
                string fileSourceExtension = System.IO.Path.GetExtension(sourcePictureName).ToLower();
                string fileWaterExtension = System.IO.Path.GetExtension(waterPictureName).ToLower();
                //
                // 判断文件是否存在,以及类型是否正确
                //
    
          if (System.IO.File.Exists(System.Web.HttpContext.Current.Server.MapPath(sourcePictureName)) == false ||System.IO.File.Exists(System.Web.HttpContext.Current.Server.MapPath(waterPictureName))==false || (fileSourceExtension != ".gif" &&fileSourceExtension != ".jpg" &&  fileSourceExtension != ".png") || ( fileWaterExtension != ".gif" && fileWaterExtension != ".jpg" && fileWaterExtension != ".png")
                    )
                {
                    return sourcePicture;
                }
    
                //
                // 目标图片名称及全路径
                //
                string targetImage = sourcepictureName2.Replace(System.IO.Path.GetExtension(sourcepictureName2), "") + "_1101.jpg";
    
                //
                // 将需要加上水印的图片装载到Image对象中
                //
                System.Drawing.Image imgPhoto = System.Drawing.Image.FromFile(System.Web.HttpContext.Current.Server.MapPath(sourcePictureName));
                //
                // 确定其长宽
                //
                int phWidth = imgPhoto.Width;
                int phHeight = imgPhoto.Height;
    
                //
                // 封装 GDI+ 位图,此位图由图形图像及其属性的像素数据组成。
                //
                Bitmap bmPhoto = new Bitmap(phWidth, phHeight, PixelFormat.Format24bppRgb);
    
                //
                // 设定分辨率
                // 
                bmPhoto.SetResolution(imgPhoto.HorizontalResolution, imgPhoto.VerticalResolution);
    
                //
                // 定义一个绘图画面用来装载位图
                //
                Graphics grPhoto = Graphics.FromImage(bmPhoto);
    
                //
                //同样,由于水印是图片,我们也需要定义一个Image来装载它
                //
                System.Drawing.Image imgWatermark = new Bitmap(System.Web.HttpContext.Current.Server.MapPath(waterPictureName));
    
                //
                // 获取水印图片的高度和宽度
                //
                int wmWidth = imgWatermark.Width;
                int wmHeight = imgWatermark.Height;
    
                //SmoothingMode:指定是否将平滑处理(消除锯齿)应用于直线、曲线和已填充区域的边缘。
                // 成员名称   说明 
                // AntiAlias      指定消除锯齿的呈现。 
                // Default        指定不消除锯齿。 
                // HighQuality 指定高质量、低速度呈现。 
                // HighSpeed   指定高速度、低质量呈现。 
                // Invalid        指定一个无效模式。 
                // None          指定不消除锯齿。 
                grPhoto.SmoothingMode = SmoothingMode.AntiAlias;
    
                //
                // 第一次描绘,将我们的底图描绘在绘图画面上
                //
                grPhoto.DrawImage(imgPhoto,
                                            new Rectangle(0, 0, phWidth, phHeight),
                                            0,
                                            0,
                                            phWidth,
                                            phHeight,
                                            GraphicsUnit.Pixel);
    
                //
                // 与底图一样,我们需要一个位图来装载水印图片。并设定其分辨率
                //
                Bitmap bmWatermark = new Bitmap(bmPhoto);
                bmWatermark.SetResolution(imgPhoto.HorizontalResolution, imgPhoto.VerticalResolution);
    
                //
                // 继续,将水印图片装载到一个绘图画面grWatermark
                //
                Graphics grWatermark = Graphics.FromImage(bmWatermark);
    
                //
                //ImageAttributes 对象包含有关在呈现时如何操作位图和图元文件颜色的信息。
                //       
                ImageAttributes imageAttributes = new ImageAttributes();
    
                //
                //Colormap: 定义转换颜色的映射
                //
                ColorMap colorMap = new ColorMap();
    
                //
                //我的水印图被定义成拥有绿色背景色的图片被替换成透明
                //
                colorMap.OldColor = Color.FromArgb(255, 0, 255, 0);
                colorMap.NewColor = Color.FromArgb(0, 0, 0, 0);
    
                ColorMap[] remapTable = { colorMap };
    
                imageAttributes.SetRemapTable(remapTable, ColorAdjustType.Bitmap);
    
                float[][] colorMatrixElements = { 
               new float[] {1.0f, 0.0f, 0.0f, 0.0f, 0.0f}, // red红色
               new float[] {0.0f, 1.0f, 0.0f, 0.0f, 0.0f}, //green绿色
               new float[] {0.0f, 0.0f, 1.0f, 0.0f, 0.0f}, //blue蓝色       
               new float[] {0.0f, 0.0f, 0.0f, alpha, 0.0f}, //透明度     
               new float[] {0.0f, 0.0f, 0.0f, 0.0f, 1.0f}};//
    
                // ColorMatrix:定义包含 RGBA 空间坐标的 5 x 5 矩阵。
                // ImageAttributes 类的若干方法通过使用颜色矩阵调整图像颜色。
                ColorMatrix wmColorMatrix = new ColorMatrix(colorMatrixElements);
    
    
                imageAttributes.SetColorMatrix(wmColorMatrix, ColorMatrixFlag.Default,
                 ColorAdjustType.Bitmap);
    
                //
                //上面设置完颜色,下面开始设置位置
                //
                int xPosOfWm=Convert.ToInt32(left);
                int yPosOfWm=Convert.ToInt32(top);
                //
                // 第二次绘图,把水印印上去
                //
                grWatermark.DrawImage(imgWatermark,
                 new Rectangle(xPosOfWm,
                                     yPosOfWm,
                                     wmWidth,
                                     wmHeight),
                                     0,
                                     0,
                                     wmWidth,
                                     wmHeight,
                                     GraphicsUnit.Pixel,
                                     imageAttributes);
    
    
                imgPhoto = bmWatermark;
                grPhoto.Dispose();
                grWatermark.Dispose();
    
                //
                // 保存文件到服务器的文件夹里面
                //
                imgPhoto.Save(System.Web.HttpContext.Current.Server.MapPath(targetImage), ImageFormat.Jpeg);
                imgPhoto.Dispose();
                imgWatermark.Dispose();
                return targetImage.Replace(BigwaterPath, "");
            }
    
            /// <summary>
            /// 在图片上添加水印文字
            /// </summary>
            /// <param name="sourcePicture">源图片文件(文件名,不包括路径)</param>
            /// <param name="waterWords">需要添加到图片上的文字</param>
            /// <param name="alpha">透明度</param>
            /// <param name="position">位置</param>
            /// <param name="PicturePath">文件路径</param>
            /// <returns></returns>
            public static string DrawWords(string sourcePicture,string waterWords,float alpha, ImagePosition position, string PicturePath)
            {
                //
                // 判断参数是否有效
                //
                if (sourcePicture == string.Empty || waterWords == string.Empty || alpha == 0.0 || PicturePath == string.Empty)
                {
                    return sourcePicture;
                }
    
                //
                // 源图片全路径
                //
                if (PicturePath.Substring(PicturePath.Length - 1, 1) != "\\")
                    PicturePath += "\\";
                string sourcePictureName = PicturePath + sourcePicture;
                string fileExtension = System.IO.Path.GetExtension(sourcePictureName).ToLower();
    
                //
                // 判断文件是否存在,以及文件名是否正确
                //
                if (System.IO.File.Exists(System.Web.HttpContext.Current.Server.MapPath(sourcePictureName)) == false || (
                    fileExtension != ".gif" &&
                    fileExtension != ".jpg" &&
                    fileExtension != ".png"))
                {
                    return sourcePicture;
                }
    
                //
                // 目标图片名称及全路径
                //
                string targetImage = sourcePictureName.Replace(System.IO.Path.GetExtension(sourcePictureName), "") + "_0703.jpg";
    
                //创建一个图片对象用来装载要被添加水印的图片
                Image imgPhoto = Image.FromFile(System.Web.HttpContext.Current.Server.MapPath(sourcePictureName));
    
                //获取图片的宽和高
                int phWidth = imgPhoto.Width;
                int phHeight = imgPhoto.Height;
    
                //
                //建立一个bitmap,和我们需要加水印的图片一样大小
                Bitmap bmPhoto = new Bitmap(phWidth, phHeight, PixelFormat.Format24bppRgb);
    
                //SetResolution:设置此 Bitmap 的分辨率
                //这里直接将我们需要添加水印的图片的分辨率赋给了bitmap
                bmPhoto.SetResolution(imgPhoto.HorizontalResolution, imgPhoto.VerticalResolution);
    
                //Graphics:封装一个 GDI+ 绘图图面。
                Graphics grPhoto = Graphics.FromImage(bmPhoto);
    
                //设置图形的品质
                grPhoto.SmoothingMode = SmoothingMode.AntiAlias;
    
                //将我们要添加水印的图片按照原始大小描绘(复制)到图形中
                grPhoto.DrawImage(
                 imgPhoto,                                           //   要添加水印的图片
                 new Rectangle(0, 0, phWidth, phHeight), // 根据要添加的水印图片的宽和高
                 0,                                                     // X方向从0点开始描绘
                 0,                                                     // Y方向 
                 phWidth,                                            // X方向描绘长度
                 phHeight,                                           // Y方向描绘长度
                 GraphicsUnit.Pixel);                              // 描绘的单位,这里用的是像素
    
                //根据图片的大小我们来确定添加上去的文字的大小
                //在这里我们定义一个数组来确定
                int[] sizes = new int[] { 16, 14, 12, 10, 8, 6, 4 };
    
                //字体
                Font crFont = null;
                //矩形的宽度和高度,SizeF有三个属性,分别为Height高,width宽,IsEmpty是否为空
                SizeF crSize = new SizeF();
    
                //利用一个循环语句来选择我们要添加文字的型号
                //直到它的长度比图片的宽度小
                for (int i = 0; i < 7; i++)
                {
                    crFont = new Font("arial", sizes[i], FontStyle.Bold);
    
                    //测量用指定的 Font 对象绘制并用指定的 StringFormat 对象格式化的指定字符串。
                    crSize = grPhoto.MeasureString(waterWords, crFont);
    
                    // ushort 关键字表示一种整数数据类型
                    if ((ushort)crSize.Width < (ushort)phWidth)
                        break;
                }
    
                //截边5%的距离,定义文字显示(由于不同的图片显示的高和宽不同,所以按百分比截取)
                int yPixlesFromBottom = (int)(phHeight * .05);
    
                //定义在图片上文字的位置
                float wmHeight = crSize.Height;
                float wmWidth = crSize.Width;
    
                float xPosOfWm;
                float yPosOfWm;
    
                switch (position)
                {
                    case ImagePosition.BottomMiddle:
                        xPosOfWm = phWidth / 2;
                        yPosOfWm = phHeight - wmHeight - 10;
                        break;
                    case ImagePosition.Center:
                        xPosOfWm = phWidth / 2;
                        yPosOfWm = phHeight / 2;
                        break;
                    case ImagePosition.LeftBottom:
                        xPosOfWm = wmWidth;
                        yPosOfWm = phHeight - wmHeight - 10;
                        break;
                    case ImagePosition.LeftTop:
                        xPosOfWm = wmWidth / 2;
                        yPosOfWm = wmHeight / 2;
                        break;
                    case ImagePosition.RightTop:
                        xPosOfWm = phWidth - wmWidth - 10;
                        yPosOfWm = wmHeight;
                        break;
                    case ImagePosition.RigthBottom:
                        xPosOfWm = phWidth - wmWidth - 10;
                        yPosOfWm = phHeight - wmHeight - 10;
                        break;
                    case ImagePosition.TopMiddle:
                        xPosOfWm = phWidth / 2;
                        yPosOfWm = wmWidth;
                        break;
                    default:
                        xPosOfWm = wmWidth;
                        yPosOfWm = phHeight - wmHeight - 10;
                        break;
                }
    
                //封装文本布局信息(如对齐、文字方向和 Tab 停靠位),显示操作(如省略号插入和国家标准 (National) 数字替换)和 OpenType 功能。
                StringFormat StrFormat = new StringFormat();
    
                //定义需要印的文字居中对齐
                StrFormat.Alignment = StringAlignment.Center;
    
                //SolidBrush:定义单色画笔。画笔用于填充图形形状,如矩形、椭圆、扇形、多边形和封闭路径。
                //这个画笔为描绘阴影的画笔,呈灰色
                int m_alpha = Convert.ToInt32(256 * alpha);
                SolidBrush semiTransBrush2 = new SolidBrush(Color.FromArgb(m_alpha, 0, 0, 0));
    
                //描绘文字信息,这个图层向右和向下偏移一个像素,表示阴影效果
                //DrawString 在指定矩形并且用指定的 Brush 和 Font 对象绘制指定的文本字符串。
                grPhoto.DrawString(waterWords,                                    //string of text
                                           crFont,                                         //font
                                           semiTransBrush2,                            //Brush
                                           new PointF(xPosOfWm + 1, yPosOfWm + 1), //Position
                                           StrFormat);
    
                //从四个 ARGB 分量(alpha、红色、绿色和蓝色)值创建 Color 结构,这里设置透明度为153
                //这个画笔为描绘正式文字的笔刷,呈白色
                SolidBrush semiTransBrush = new SolidBrush(Color.FromArgb(153, 255, 255, 255));
    
                //第二次绘制这个图形,建立在第一次描绘的基础上
                grPhoto.DrawString(waterWords,                 //string of text
                                           crFont,                                   //font
                                           semiTransBrush,                           //Brush
                                           new PointF(xPosOfWm, yPosOfWm), //Position
                                           StrFormat);
    
                //imgPhoto是我们建立的用来装载最终图形的Image对象
                //bmPhoto是我们用来制作图形的容器,为Bitmap对象
                imgPhoto = bmPhoto;
                //释放资源,将定义的Graphics实例grPhoto释放,grPhoto功德圆满
                grPhoto.Dispose();
    
                //将grPhoto保存
                imgPhoto.Save(System.Web.HttpContext.Current.Server.MapPath(targetImage), ImageFormat.Jpeg);
                imgPhoto.Dispose();
    
                return targetImage.Replace(PicturePath, "");
            }
        }
    
        /// <summary>
        /// 装载水印图片的相关信息
        /// </summary>
        public class WaterImage
        {
            public WaterImage()
            {
    
            }
    
            private string m_sourcePicture;
            /// <summary>
            /// 源图片地址名字(带后缀)
            /// </summary>
            public string SourcePicture
            {
                get { return m_sourcePicture; }
                set { m_sourcePicture = value; }
            }
    
            private string m_waterImager;
            /// <summary>
            /// 水印图片名字(带后缀)
            /// </summary>
            public string WaterPicture
            {
                get { return m_waterImager; }
                set { m_waterImager = value; }
            }
    
            private float m_alpha;
            /// <summary>
            /// 水印图片文字的透明度
            /// </summary>
            public float Alpha
            {
                get { return m_alpha; }
                set { m_alpha = value; }
            }
    
            private ImagePosition m_postition;
            /// <summary>
            /// 水印图片或文字在图片中的位置
            /// </summary>
            public ImagePosition Position
            {
                get { return m_postition; }
                set { m_postition = value; }
            }
    
            private string m_words;
            /// <summary>
            /// 水印文字的内容
            /// </summary>
            public string Words
            {
                get { return m_words; }
                set { m_words = value; }
            }
    
        }

    效果如图:

     能够对水印图片进行移动和颜色的渐变

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  • 原文地址:https://www.cnblogs.com/1003487863qq/p/2881777.html
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