C#实现的添加水印图片/文字
using System;using System.Drawing;using System.Drawing.Imaging;using System.Drawing.Drawing2D;using System.IO;/** * 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WaterImageManager实例* 利用WaterImageManager实例进行DrawImage（）印图片水印* DrawWords（）印文字水印* */namespace Common.Utils{/// <summary>/// 图片位置/// </summary>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}/// <summary>/// 字体集/// </summary>public enum FontFamilys{CUSTOM,Arial,Batang,BatangChe,Calibri,Cambria,Candara,Consolas,Ebrima,Footlight_MT_Light,Kalinga,Kokila,Mangal,Symbol,Times_New_Roman,Webdings,仿宋,华文中宋,华文仿宋,华文宋体,华文彩云,华文新魏,华文楷体,华文琥珀,华文细黑,华文行楷,华文隶书,宋体,幼圆,微软雅黑,新宋体,方正姚体,方正舒体,楷体,隶书,黑体}/// <summary>/// 水印图片的操作管理/// </summary>public class WaterImageManager{private int padding = 0;//内容间隔private string targetPicName = "_mixture_pic";//默认生成图片的文件名字private string targetPicPath = "";//默认生成图片的目录private ImageFormat picFormat = ImageFormat.Png;//默认生成图片的格式public int Padding { get; set; }public string TargetPicName { get; set; }public string TargetPicPath { get; set; }public ImageFormat PicFormat { get; set; }/// <summary>/// 生成一个新的水印图片制作实例(默认)/// </summary>public WaterImageManager(){Padding = padding;TargetPicName = targetPicName;TargetPicPath = targetPicPath;PicFormat = picFormat;}/// <summary>/// 生成一个新的水印图片制作实例(有参)/// </summary>/// <param name="tragetPicName">生成合成图片的文件名称</param>/// <param name="tragetPicPath">生成合成图片的文件路径</param>/// <param name="padding">指定水印距离父容器边距</param>/// <param name="picFormat">指定生成合成图片的图片格式</param>public WaterImageManager(string targetPicName, string targetPicPath, int padding, ImageFormat picFormat){this.Padding = padding;this.TargetPicName = targetPicName;this.TargetPicPath = targetPicPath.EndsWith(@"\") ? targetPicPath : targetPicPath + @"\";this.PicFormat = picFormat;}/// <summary>/// 合成图片/// </summary>/// <param name="sourcePictureName">源文件名(包括后缀)</param>/// <param name="sourcePicturePath">源文件路径</param>/// <param name="waterPictureName">水印文件名(包括后缀)</param>/// <param name="waterPicturePath">水印文件路径</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>/// <returns>合成图片的完整路径</returns>public string DrawImage(string sourcePictureName,string sourcePicturePath,string waterPictureName,string waterPicturePath,float alpha,ImagePosition position){//// 判断参数是否有效//if (sourcePictureName == string.Empty || waterPictureName == string.Empty || alpha == 0.0 || sourcePicturePath == string.Empty || waterPicturePath == string.Empty){return sourcePicturePath + sourcePictureName + "." + PicFormat.ToString().ToLower();}if (!sourcePicturePath.EndsWith(@"\"))sourcePicturePath = sourcePicturePath + @"\";if (!waterPicturePath.EndsWith(@"\"))waterPicturePath = waterPicturePath + @"\";//// 源图片，水印图片全路径//string _sourcePictureName = sourcePicturePath + sourcePictureName;string _waterPictureName = waterPicturePath + waterPictureName;if (!File.Exists(_sourcePictureName))throw new FileNotFoundException(_sourcePictureName + " file not found!");if (!File.Exists(_waterPictureName))throw new FileNotFoundException(_waterPictureName + " file not found!");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 sourcePicturePath + sourcePictureName + "." + PicFormat.ToString().ToLower();}//// 目标图片名称及全路径//TargetPicPath = TargetPicPath.EndsWith(@"\") ? TargetPicPath : TargetPicPath + @"\";string targetImage = TargetPicPath == string.Empty ? _sourcePictureName.Replace(System.IO.Path.GetExtension(_sourcePictureName), "") + TargetPicName + "." + PicFormat.ToString().ToLower() :TargetPicPath + TargetPicName + "." + PicFormat.ToString().ToLower();//// 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, imgPhoto.PixelFormat);//phWidth, phHeight, PixelFormat.Format24bppRgb imgPhoto//// 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 - Padding;break;case ImagePosition.Center:xPosOfWm = (phWidth - wmWidth) / 2;yPosOfWm = (phHeight - wmHeight) / 2;break;case ImagePosition.LeftBottom:xPosOfWm = Padding;yPosOfWm = phHeight - wmHeight - Padding;break;case ImagePosition.LeftTop:xPosOfWm = Padding;yPosOfWm = Padding;break;case ImagePosition.RightTop:xPosOfWm = phWidth - wmWidth - Padding;yPosOfWm = Padding;break;case ImagePosition.RigthBottom:xPosOfWm = phWidth - wmWidth - Padding;yPosOfWm = phHeight - wmHeight - Padding;break;case ImagePosition.TopMiddle:xPosOfWm = (phWidth - wmWidth) / 2;yPosOfWm = Padding;break;default:xPosOfWm = Padding;yPosOfWm = phHeight - wmHeight - Padding;break;}imgPhoto.Dispose();//释放底图，解决图片保存时 “GDI+ 中发生一般性错误。”// 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//if (!System.IO.Directory.Exists(TargetPicPath))System.IO.Directory.CreateDirectory(TargetPicPath);try{imgPhoto.Save(targetImage, PicFormat);}catch (Exception e){Console.WriteLine(e.Message);}imgPhoto.Dispose();imgWatermark.Dispose();return TargetPicPath + TargetPicName + "." + PicFormat.ToString().ToLower();}/// <summary>/// 在图片上添加水印文字/// </summary>/// <param name="sourcePicture">源图片文件名(包含后缀)</param>/// <param name="waterWords">需要添加到图片上的文字</param>/// <param name="alpha">透明度（取值区间(0.0,1.0]）</param>/// <param name="position">位置</param>/// <param name="PicturePath">文件路径</param>/// <returns></returns>public string DrawWords(string sourcePictureName,string sourcePicturePath,string waterWords,float alpha,FontFamilys fontFamily,FontStyle style,ImagePosition position){//// 判断参数是否有效//if (sourcePictureName == string.Empty || waterWords == string.Empty || alpha == 0.0 || sourcePicturePath == string.Empty){return sourcePicturePath + sourcePictureName;}if (!sourcePicturePath.EndsWith(@"\"))sourcePicturePath = sourcePicturePath + @"\";//// 源图片全路径//string _sourcePictureName = sourcePicturePath + sourcePictureName;if (!File.Exists(_sourcePictureName))throw new FileNotFoundException(_sourcePictureName + " file not found!");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 sourcePicturePath + sourcePictureName;}//// 目标图片名称及全路径//string targetImage = TargetPicPath == string.Empty ?_sourcePictureName.Replace(System.IO.Path.GetExtension(_sourcePictureName), "") + TargetPicName + "." + PicFormat.ToString().ToLower() :TargetPicPath + TargetPicName + "." + PicFormat.ToString().ToLower();//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, imgPhoto.PixelFormat);//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bitmapbmPhoto.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, 2 };//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 < 8; i++){crFont = new Font(fontFamily.ToString(), sizes[i], style);//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 - Padding;break;case ImagePosition.Center:xPosOfWm = phWidth / 2;yPosOfWm = phHeight / 2;break;case ImagePosition.RigthBottom:xPosOfWm = phWidth / 2 + wmWidth / 2;yPosOfWm = phHeight - wmHeight - Padding;break;case ImagePosition.RightTop:xPosOfWm = phWidth / 2 + wmWidth / 2;yPosOfWm = wmHeight / 2 + Padding;break;case ImagePosition.LeftTop:xPosOfWm = wmWidth / 2 + Padding;yPosOfWm = wmHeight / 2 + Padding;break;case ImagePosition.LeftBottom:xPosOfWm = wmWidth / 2 + Padding;yPosOfWm = phHeight - wmHeight - Padding;break;case ImagePosition.TopMiddle:xPosOfWm = phWidth / 2;yPosOfWm = wmHeight / 2 + Padding;break;default:xPosOfWm = wmWidth;yPosOfWm = phHeight - wmHeight - Padding;break;}imgPhoto.Dispose();//释放底图，解决图片保存时 “GDI+ 中发生一般性错误。”//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(255 * 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 textcrFont, //fontsemiTransBrush2, //Brushnew PointF(xPosOfWm + 1, yPosOfWm + 1), //PositionStrFormat);//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 textcrFont,//fontsemiTransBrush, //Brushnew PointF(xPosOfWm, yPosOfWm), //PositionStrFormat);//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if (!System.IO.Directory.Exists(TargetPicPath))System.IO.Directory.CreateDirectory(TargetPicPath);try{imgPhoto.Save(targetImage, PicFormat);}catch(Exception e){Console.WriteLine(e.Message);}imgPhoto.Dispose();return TargetPicPath + TargetPicName + "." + PicFormat.ToString().ToLower();}/// 无损压缩图片 /// <param name="sFile">原图片</param> /// <param name="dFile">压缩后保存位置</param> /// <param name="dHeight">高度</param> /// <param name="dWidth">宽度</param> /// <param name="flag">压缩质量(数字越小压缩率越高) 1-100</param> /// <returns></returns> public bool GetPicThumbnail(string sFile, string dFile, int dHeight, int dWidth, int flag){System.Drawing.Image iSource = System.Drawing.Image.FromFile(sFile);ImageFormat tFormat = iSource.RawFormat;int sW = 0, sH = 0;//按比例缩放 Size tem_size = new Size(iSource.Width, iSource.Height);if (tem_size.Width > dHeight || tem_size.Width > dWidth){if ((tem_size.Width * dHeight) > (tem_size.Width * dWidth)){sW = dWidth;sH = (dWidth * tem_size.Height) / tem_size.Width;}else{sH = dHeight;sW = (tem_size.Width * dHeight) / tem_size.Height;}}else{sW = tem_size.Width;sH = tem_size.Height;}Bitmap ob = new Bitmap(dWidth, dHeight);Graphics g = Graphics.FromImage(ob);g.Clear(Color.WhiteSmoke);positingQuality = CompositingQuality.HighQuality;g.SmoothingMode = SmoothingMode.HighQuality;g.InterpolationMode = InterpolationMode.HighQualityBicubic;g.DrawImage(iSource, new Rectangle((dWidth - sW) / 2, (dHeight - sH) / 2, sW, sH), 0, 0, iSource.Width, iSource.Height, GraphicsUnit.Pixel);g.Dispose();//以下代码为保存图片时，设置压缩质量 EncoderParameters ep = new EncoderParameters();long[] qy = new long[1];qy[0] = flag;//设置压缩的比例1-100 EncoderParameter eParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, qy);ep.Param[0] = eParam;try{ImageCodecInfo[] arrayICI = ImageCodecInfo.GetImageEncoders();ImageCodecInfo jpegICIinfo = null;for (int x = 0; x < arrayICI.Length; x++){if (arrayICI[x].FormatDescription.Equals("JPEG")){jpegICIinfo = arrayICI[x];break;}}if (jpegICIinfo != null){ob.Save(dFile, jpegICIinfo, ep);//dFile是压缩后的新路径 }else{ob.Save(dFile, tFormat);}return true;}catch(Exception e){Console.WriteLine(e.Message);return false;}finally{iSource.Dispose();ob.Dispose();}}}/// <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; }}}}
使用方式参考：
var parntImg = @"icon.png";var waterImg = @"sup_icon.png";var saveImg = @"C:\Users\luzhenyu\Desktop\test\";WaterImageManage manage = new WaterImageManage("", "", 0, ImageFormat.Png);var temp = manage.DrawImage(parntImg, saveImg, waterImg, saveImg, 1.0f, ImagePosition.TopMiddle);//水印图片var temp = manage.DrawWords(parntImg, saveImg, "我爱你", 0.5f, FontFamilys.黑体, FontStyle.Regular, ImagePosition.TopMiddle);//水印文字manage.GetPicThumbnail(saveImg + "icon.png", saveImg + "hahahaha.png", 48, 48, 100);//无损压缩图片
