ASP.NET(C#)图片加文字、图片水印,神啊,看看吧

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ASP.NET(C#)图片加文字、图片水印,神啊,看看吧

2023-12-23 21:49| 来源: 网络整理| 查看: 265

ASP.NET(C#)图片加文字、图片水印

一、图片上加文字:

//using System.Drawing; //using System.IO; //using System.Drawing.Imaging; private void AddTextToImg(string fileName,string text) { if(!File.Exists(MapPath(fileName))) { throw new FileNotFoundException("The file don't exist!"); } if( text == string.Empty ) { return; } //还需要判断文件类型是否为图像类型,这里就不赘述了 System.Drawing.Image image = System.Drawing.Image.FromFile(MapPath(fileName)); Bitmap bitmap = new Bitmap(image,image.Width,image.Height); Graphics g = Graphics.FromImage(bitmap); float fontSize = 12.0f; //字体大小 float textWidth = text.Length*fontSize; //文本的长度 //下面定义一个矩形区域,以后在这个矩形里画上白底黑字 float rectX = 0; float rectY = 0; float rectWidth = text.Length*(fontSize+8); float rectHeight = fontSize+8; //声明矩形域 RectangleF textArea = new RectangleF(rectX,rectY,rectWidth,rectHeight); Font font = new Font("宋体",fontSize); //定义字体 Brush whiteBrush = new SolidBrush(Color.White); //白笔刷,画文字用 Brush blackBrush = new SolidBrush(Color.Black); //黑笔刷,画背景用 g.FillRectangle(blackBrush,rectX,rectY,rectWidth,rectHeight); g.DrawString(text,font,whiteBrush,textArea); MemoryStream ms = new MemoryStream( ); //保存为Jpg类型 bitmap.Save(ms,ImageFormat.Jpeg); //输出处理后的图像,这里为了演示方便,我将图片显示在页面中了 Response.Clear(); Response.ContentType = "image/jpeg"; Response.BinaryWrite( ms.ToArray() ); g.Dispose(); bitmap.Dispose(); image.Dispose(); }

二、图片上加水印:

//using System; //using System.Web; //using System.Drawing; //using System.Drawing.Drawing2D; //using System.Drawing.Imaging; //using System.IO; //using System.Reflection; /// /// 给图片上水印 /// /// 原图片地址 /// 水印图片地址 public void MarkWater(string filePath,string waterFile) { //GIF不水印 int i = filePath.LastIndexOf("."); string ex = filePath.Substring(i,filePath.Length - i); if(string.Compare(ex,".gif",true) == 0) { return; } string ModifyImagePath = BasePath + filePath;//修改的图像路径 int lucencyPercent=25; Image modifyImage=null; Image drawedImage=null; Graphics g=null; try { //建立图形对象 modifyImage=Image.FromFile(ModifyImagePath,true); drawedImage=Image.FromFile(BasePath + waterFile,true); g=Graphics.FromImage(modifyImage); //获取要绘制图形坐标 int x=modifyImage.Width-drawedImage.Width; int y=modifyImage.Height-drawedImage.Height; //设置颜色矩阵 float[][] matrixItems ={ new float[] {1, 0, 0, 0, 0}, new float[] {0, 1, 0, 0, 0}, new float[] {0, 0, 1, 0, 0}, new float[] {0, 0, 0, (float)lucencyPercent/100f, 0}, new float[] {0, 0, 0, 0, 1}}; ColorMatrix colorMatrix = new ColorMatrix(matrixItems); ImageAttributes imgAttr=new ImageAttributes(); imgAttr.SetColorMatrix(colorMatrix,ColorMatrixFlag.Default,ColorAdjustType.Bitmap); //绘制阴影图像 g.DrawImage(drawedImage,new Rectangle(x,y,drawedImage.Width,drawedImage.Height),10,10,drawedImage.Width,drawedImage.Height,GraphicsUnit.Pixel,imgAttr); //保存文件 string[] allowImageType={".jpg",".gif",".png",".bmp",".tiff",".wmf",".ico"}; FileInfo fi=new FileInfo(ModifyImagePath); ImageFormat imageType=ImageFormat.Gif; switch(fi.Extension.ToLower()) { case ".jpg": imageType=ImageFormat.Jpeg; break; case ".gif": imageType=ImageFormat.Gif; break; case ".png": imageType=ImageFormat.Png; break; case ".bmp": imageType=ImageFormat.Bmp; break; case ".tif": imageType=ImageFormat.Tiff; break; case ".wmf": imageType=ImageFormat.Wmf; break; case ".ico": imageType=ImageFormat.Icon; break; default: break; } MemoryStream ms=new MemoryStream(); modifyImage.Save(ms,imageType); byte[] imgData=ms.ToArray(); modifyImage.Dispose(); drawedImage.Dispose(); g.Dispose(); FileStream fs=null; File.Delete(ModifyImagePath); fs=new FileStream(ModifyImagePath,FileMode.Create,FileAccess.Write); if(fs!=null) { fs.Write(imgData,0,imgData.Length); fs.Close(); } } finally { try { drawedImage.Dispose(); modifyImage.Dispose(); g.Dispose(); } catch { } } }

三、 图片+水印(透明)函数

/// 添加图片水印 /// /// 原图片绝对地址 /// 文件后缀 public static string addWaterMark(string path,string fileExt) { System.Drawing.Image image = System.Drawing.Image.FromFile(path); Bitmap b = new Bitmap(image.Width, image.Height,System.Drawing.Imaging.PixelFormat.Format24bppRgb); Graphics g = Graphics.FromImage(b); g.Clear(Color.White); g.DrawImage(image, 0, 0, image.Width, image.Height); Image watermark = new Bitmap(ConfigurationSettings.AppSettings["PersonalPath"] + @"images/logo.jpg"); System.Drawing.Imaging.ImageAttributes imageAttributes = new System.Drawing.Imaging.ImageAttributes(); 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); 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, 0.3f, 0.0f}, new float[] {0.0f, 0.0f, 0.0f, 0.0f, 1.0f} }; System.Drawing.Imaging.ColorMatrix colorMatrix = new System.Drawing.Imaging.ColorMatrix(colorMatrixElements); imageAttributes.SetColorMatrix(colorMatrix, System.Drawing.Imaging.ColorMatrixFlag.Default, System.Drawing.Imaging.ColorAdjustType.Bitmap); int xpos = 0; int ypos = 0; xpos = ((image.Width - watermark.Width) - 10); ypos = image.Height - watermark.Height - 10; g.DrawImage(watermark, new Rectangle(xpos, ypos, watermark.Width, watermark.Height), 0, 0, watermark.Width, watermark.Height, GraphicsUnit.Pixel, imageAttributes); watermark.Dispose(); imageAttributes.Dispose(); //保存加水印过后的图片,删除原始图片 Random ro=new Random((int)DateTime.Now.Ticks); string temppath = System.DateTime.Now.ToString("yyyy") + "//" + System.DateTime.Now.ToString("MMdd"); string fileName = temppath + "//" + DateTime.Now.ToString("yyyyMMddHHmmss") + ro.Next(10000) + fileExt; string filepath = Functions.GetUserFactPath(User.GetUserFromSession().Adddate,User.GetUserFromSession().UserId) + "3//"; b.Save(filepath + fileName); b.Dispose(); image.Dispose(); if(File.Exists(path)) { File.Delete(path); } return fileName; }

 

 

四、C#图片水印生成类(图片、文字、透明水印)

/* * Class:WaterImage * Use for add a water Image to the picture both words and image * 2007.07.23 create the file * * http://www.freeatom.com/ 欢迎您的来访 * * 使用说明: *  建议先定义一个WaterImage实例 *  然后利用实例的属性,去匹配需要进行操作的参数 *  然后定义一个WaterImageManage实例 *  利用WaterImageManage实例进行DrawImage(),印图片水印 *  DrawWords()印文字水印 * -*/ using System; using System.Drawing; using System.Drawing.Imaging; using System.Drawing.Drawing2D; using System.IO; /// /// 图片位置 /// 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 } /// /// 水印图片的操作管理 Design by Gary Gong From Demetersoft.com /// public class WaterImageManage { /// /// 生成一个新的水印图片制作实例 /// public WaterImageManage () { // // TODO: Add constructor logic here // } /// /// 添加图片水印 /// /// 源图片文件名 /// 水印图片文件名 /// 透明度(0.1-1.0数值越小透明度越高) /// 位置 /// 图片的路径 /// 返回生成于指定文件夹下的水印文件名 public string DrawImage(string sourcePicture, string waterImage, float alpha, ImagePosition position, string PicturePath ) { // // 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 // string sourcePictureName = PicturePath + sourcePicture; string waterPictureName = PicturePath + 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(sourcePictureName) == false || System.IO.File.Exists(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 = sourcePictureName.Replace ( System.IO.Path.GetExtension(sourcePictureName),"") + "_1101.jpg"; // // 将需要加上水印的图片装载到Image对象中 // Image imgPhoto = Image.FromFile(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 // Image imgWatermark = new Bitmap(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; int yPosOfWm; switch (position) { case ImagePosition .BottomMiddle : xPosOfWm = (phWidth-wmWidth ) / 2 ; yPosOfWm = phHeight- wmHeight -10; break ; case ImagePosition .Center : xPosOfWm = (phWidth - wmWidth) / 2; yPosOfWm = (phHeight-wmHeight ) / 2; break ; case ImagePosition .LeftBottom : xPosOfWm = 10; yPosOfWm = phHeight - wmHeight - 10; break ; case ImagePosition .LeftTop : xPosOfWm = 10; yPosOfWm = 10; break; case ImagePosition .RightTop : xPosOfWm = phWidth - wmWidth - 10; yPosOfWm = 10; break ; case ImagePosition .RigthBottom : xPosOfWm = phWidth - wmWidth - 10; yPosOfWm = phHeight - wmHeight - 10; break ; case ImagePosition.TopMiddle : xPosOfWm = (phWidth - wmWidth) / 2; yPosOfWm = 10; break ; default: xPosOfWm = 10; yPosOfWm = phHeight - wmHeight - 10; break; } // // 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(targetImage, ImageFormat.Jpeg); imgPhoto.Dispose(); imgWatermark.Dispose(); return targetImage.Replace (PicturePath,""); } /// /// 在图片上添加水印文字 /// /// 源图片文件 /// 需要添加到图片上的文字 /// 透明度 /// 位置 /// 文件路径 /// public 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 // 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(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(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(targetImage, ImageFormat.Jpeg); imgPhoto.Dispose(); return targetImage.Replace(PicturePath, ""); } } /// /// 装载水印图片的相关信息 /// public class WaterImage { public WaterImage () { } private string m_sourcePicture; /// /// 源图片地址名字(带后缀) /// public string SourcePicture { get { return m_sourcePicture; } set { m_sourcePicture = value; } } private string m_waterImager; /// /// 水印图片名字(带后缀) /// public string WaterPicture { get { return m_waterImager; } set { m_waterImager = value; } } private float m_alpha; /// /// 水印图片文字的透明度 /// public float Alpha { get { return m_alpha; } set { m_alpha = value; } } private ImagePosition m_postition; /// /// 水印图片或文字在图片中的位置 /// public ImagePosition Position { get { return m_postition; } set { m_postition = value; } } private string m_words; /// /// 水印文字的内容 /// public string Words { get { return m_words; } set { m_words = value; } } }

 



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