c#给图片添加文字的代码小结
转载 &发布时间：日 00:17:27 & 作者：
c#编程中，我们需要为图片添加文字水印，那么就可以参考下面的几个代码
代码实例一
代码如下: using S using System.IO; using System.C using System.D using System.Drawing.Drawing2D; using System.Drawing.I namespace Imag_writer { /// &summary& /// 水印的类型 /// &/summary& public enum WaterMarkType { /// &summary& /// 文字水印 /// &/summary& TextMark, /// &summary& /// 图片水印 /// &/summary& //ImageMark // 暂时只能添加文字水印 }; /// &summary& /// 水印的位置 /// &/summary& public enum WaterMarkPosition { /// &summary& /// 左上角 /// &/summary& WMP_Left_Top, /// &summary& /// 左下角 /// &/summary& WMP_Left_Bottom, /// &summary& /// 右上角 /// &/summary& WMP_Right_Top, /// &summary& /// 右下角 /// &/summary& WMP_Right_Bottom }; /// &summary& /// 处理图片的类（包括加水印，生成缩略图） /// &/summary& public class ImageWaterMark { public ImageWaterMark() { // // TODO: 在此处添加构造函数逻辑 // } #region 给图片加水印 /// &summary& /// 添加水印(分图片水印与文字水印两种) /// &/summary& /// ¶m name="oldpath"&原图片绝对地址&/param& /// ¶m name="newpath"&新图片放置的绝对地址&/param& /// ¶m name="wmtType"&要添加的水印的类型&/param& /// ¶m name="sWaterMarkContent"&水印内容，若添加文字水印，此即为要添加的文字； /// 若要添加图片水印，此为图片的路径&/param& public void addWaterMark(string oldpath, string newpath, WaterMarkType wmtType, string sWaterMarkContent) { try { Image image = Image.FromFile(oldpath); Bitmap b = new Bitmap(image.Width, image.Height, PixelFormat.Format24bppRgb); Graphics g = Graphics.FromImage(b); g.Clear(Color.White); g.SmoothingMode = SmoothingMode.HighQ g.InterpolationMode = InterpolationMode.H g.DrawImage(image, 0, 0, image.Width, image.Height); switch (wmtType) { case WaterMarkType.TextMark: //文字水印 this.addWatermarkText(g, sWaterMarkContent, "WM_BOTTOM_RIGHT", image.Width, image.Height); } b.Save(newpath); b.Dispose(); image.Dispose(); } catch { if(File.Exists(oldpath)) { File.Delete(oldpath); } } finally { if(File.Exists(oldpath)) { File.Delete(oldpath); } } } /// &summary& /// 加水印文字 /// &/summary& /// ¶m name="picture"&imge 对象&/param& /// ¶m name="_watermarkText"&水印文字内容&/param& /// ¶m name="_watermarkPosition"&水印位置&/param& /// ¶m name="_width"&被加水印图片的宽&/param& /// ¶m name="_height"&被加水印图片的高&/param& private void addWatermarkText(Graphics picture, string _watermarkText, string _watermarkPosition, int _width, int _height) { // 确定水印文字的字体大小 int[] sizes = new int[]{32, 30, 28, 26, 24, 22, 20, 18, 16, 14, 12, 10, 8, 6, 4}; Font crFont = SizeF crSize = new SizeF(); for (int i = 0;i & sizes.L i++) { crFont = new Font("Arial Black", sizes[i], FontStyle.Bold); crSize = picture.MeasureString(_watermarkText, crFont); if((ushort)crSize.Width & (ushort)_width) { } } // 生成水印图片（将文字写到图片中） Bitmap floatBmp = new Bitmap((int)crSize.Width + 3, (int)crSize.Height + 3, PixelFormat.Format32bppArgb); Graphics fg=Graphics.FromImage(floatBmp); PointF pt=new PointF(0,0); // 画阴影文字 Brush TransparentBrush0 = new SolidBrush(Color.FromArgb(255, Color.Black)); Brush TransparentBrush1 = new SolidBrush(Color.FromArgb(255, Color.Black)); fg.DrawString(_watermarkText,crFont,TransparentBrush0, pt.X, pt.Y + 1); fg.DrawString(_watermarkText,crFont,TransparentBrush0, pt.X + 1, pt.Y); fg.DrawString(_watermarkText,crFont,TransparentBrush1, pt.X + 1, pt.Y + 1); fg.DrawString(_watermarkText,crFont,TransparentBrush1, pt.X, pt.Y + 2); fg.DrawString(_watermarkText,crFont,TransparentBrush1, pt.X + 2, pt.Y); TransparentBrush0.Dispose(); TransparentBrush1.Dispose(); // 画文字 fg.SmoothingMode=System.Drawing.Drawing2D.SmoothingMode.HighQ fg.DrawString(_watermarkText, crFont, new SolidBrush(Color.White), pt.X, pt.Y, StringFormat.GenericDefault); // 保存刚才的操作 fg.Save(); fg.Dispose(); // floatBmp.Save("d:\\WebSite\\DIGITALKM\\ttt.jpg"); // 将水印图片加到原图中 this.addWatermarkImage( picture, new Bitmap(floatBmp), "WM_BOTTOM_RIGHT", _width, _height); } /// &summary& /// 加水印图片 /// &/summary& /// ¶m name="picture"&imge 对象&/param& /// ¶m name="iTheImage"&Image对象（以此图片为水印）&/param& /// ¶m name="_watermarkPosition"&水印位置&/param& /// ¶m name="_width"&被加水印图片的宽&/param& /// ¶m name="_height"&被加水印图片的高&/param& private void addWatermarkImage( Graphics picture,Image iTheImage, string _watermarkPosition,int _width,int _height) { Image watermark = new Bitmap(iTheImage); ImageAttributes imageAttributes = 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}; imageAttributes.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, 0.3f, 0.0f}, new float[] {0.0f, 0.0f, 0.0f, 0.0f, 1.0f} }; ColorMatrix colorMatrix = new ColorMatrix(colorMatrixElements); imageAttributes.SetColorMatrix(colorMatrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap); int xpos = 0; int ypos = 0; int WatermarkWidth = 0; int WatermarkHeight = 0; double bl = 1d; //计算水印图片的比率 //取背景的1/4宽度来比较 if ((_width & watermark.Width * 4) && (_height & watermark.Height * 4)) { bl = 1; } else if ((_width & watermark.Width * 4) && (_height&watermark.Height * 4)) { bl = Convert.ToDouble(_height / 4) / Convert.ToDouble(watermark.Height); } else if ((_width & watermark.Width * 4) && (_height & watermark.Height * 4)) { bl = Convert.ToDouble(_width / 4) / Convert.ToDouble(watermark.Width); } else { if ((_width * watermark.Height) & (_height * watermark.Width)) { bl = Convert.ToDouble(_height / 4) / Convert.ToDouble(watermark.Height); } else { bl = Convert.ToDouble(_width / 4) / Convert.ToDouble(watermark.Width); } } WatermarkWidth = Convert.ToInt32(watermark.Width * bl); WatermarkHeight = Convert.ToInt32(watermark.Height * bl); switch (_watermarkPosition) { case "WM_TOP_LEFT": xpos = 10; ypos = 10; case "WM_TOP_RIGHT": xpos = _width - WatermarkWidth - 10; ypos = 10; case "WM_BOTTOM_RIGHT": xpos = _width - WatermarkWidth - 10; ypos = _height -WatermarkHeight - 10; case "WM_BOTTOM_LEFT": xpos = 10; ypos = _height - WatermarkHeight - 10; } picture.DrawImage( watermark, new Rectangle(xpos, ypos, WatermarkWidth, WatermarkHeight), 0, 0, watermark.Width, watermark.Height, GraphicsUnit.Pixel, imageAttributes); watermark.Dispose(); imageAttributes.Dispose(); } /// &summary& /// 加水印图片 /// &/summary& /// ¶m name="picture"&imge 对象&/param& /// ¶m name="WaterMarkPicPath"&水印图片的地址&/param& /// ¶m name="_watermarkPosition"&水印位置&/param& /// ¶m name="_width"&被加水印图片的宽&/param& /// ¶m name="_height"&被加水印图片的高&/param& private void addWatermarkImage( Graphics picture,string WaterMarkPicPath, string _watermarkPosition,int _width,int _height) { Image watermark = new Bitmap(WaterMarkPicPath); this.addWatermarkImage(picture, watermark, _watermarkPosition, _width, _height); } #endregion #region 生成缩略图 /// &summary& /// 保存图片 /// &/summary& /// ¶m name="image"&Image 对象&/param& /// ¶m name="savePath"&保存路径&/param& /// ¶m name="ici"&指定格式的编解码参数&/param& private void SaveImage(Image image, string savePath, ImageCodecInfo ici) { //设置 原图片 对象的 EncoderParameters 对象 EncoderParameters parameters = new EncoderParameters(1); parameters.Param[0] = new EncoderParameter( System.Drawing.Imaging.Encoder.Quality, ((long) 90)); image.Save(savePath, ici, parameters); parameters.Dispose(); } /// &summary& /// 获取图像编码解码器的所有相关信息 /// &/summary& /// ¶m name="mimeType"&包含编码解码器的多用途网际邮件扩充协议 (MIME) 类型的字符串&/param& /// &returns&返回图像编码解码器的所有相关信息&/returns& private ImageCodecInfo GetCodecInfo(string mimeType) { ImageCodecInfo[] CodecInfo = ImageCodecInfo.GetImageEncoders(); foreach(ImageCodecInfo ici in CodecInfo) { if(ici.MimeType == mimeType) } } /// &summary& /// 生成缩略图 /// &/summary& /// ¶m name="sourceImagePath"&原图片路径(相对路径)&/param& /// ¶m name="thumbnailImagePath"&生成的缩略图路径,如果为空则保存为原图片路径(相对路径)&/param& /// ¶m name="thumbnailImageWidth"&缩略图的宽度（高度与按源图片比例自动生成）&/param& public void ToThumbnailImages( string SourceImagePath, string ThumbnailImagePath, int ThumbnailImageWidth) { Hashtable htmimes = new Hashtable(); htmimes[".jpeg"] = "image/jpeg"; htmimes[".jpg"] = "image/jpeg"; htmimes[".png"] = "image/png"; htmimes[".tif"] = "image/tiff"; htmimes[".tiff"] = "image/tiff"; htmimes[".bmp"] = "image/bmp"; htmimes[".gif"] = "image/gif"; // 取得原图片的后缀 string sExt = SourceImagePath.Substring( SourceImagePath.LastIndexOf(".")).ToLower(); //从 原图片创建 Image 对象 Image image = Image.FromFile(SourceImagePath); int num = ((ThumbnailImageWidth / 4) * 3); int width = image.W int height = image.H //计算图片的比例 if ((((double) width) / ((double) height)) &= 1.3333f) { num = ((height * ThumbnailImageWidth) / width); } else { ThumbnailImageWidth = ((width * num) / height); } if ((ThumbnailImageWidth & 1) || (num & 1)) { } //用指定的大小和格式初始化 Bitmap 类的新实例 Bitmap bitmap = new Bitmap(ThumbnailImageWidth, num, PixelFormat.Format32bppArgb); //从指定的 Image 对象创建新 Graphics 对象 Graphics graphics = Graphics.FromImage(bitmap); //清除整个绘图面并以透明背景色填充 graphics.Clear(Color.Transparent); graphics.SmoothingMode = SmoothingMode.HighQ graphics.InterpolationMode = InterpolationMode.H //在指定位置并且按指定大小绘制 原图片 对象 graphics.DrawImage(image, new Rectangle(0, 0, ThumbnailImageWidth, num)); image.Dispose(); try { //将此 原图片 以指定格式并用指定的编解码参数保存到指定文件 SaveImage(bitmap, ThumbnailImagePath, GetCodecInfo((string)htmimes[sExt])); } catch(System.Exception e) { } } #endregion } }
代码实例二
代码如下: using S using System.Collections.G using System.ComponentM using System.D using System.D using System.L using System.T using System.Windows.F using System.IO; using System.T using System.Drawing.I /* Author : IT * Date:
14:52:53 * Blog: www.chenpan.name */ namespace WaterImage { public partial class Form2 : Form { Image imgW public Form2() { InitializeComponent(); } /// &summary& /// 从数据库中加载二进制图片 /// &/summary& /// ¶m name="sender"&&/param& /// ¶m name="e"&&/param& private void button1_Click(object sender, EventArgs e) { string strSql = "Select Top 1 FileContent From Sys_FileSave"; Byte[] byteImage = new Byte[0]; byteImage = (Byte[])(DbHelperSQL.GetSingle(strSql)); MemoryStream stmBLOBData = new MemoryStream(byteImage); imgWeight = Image.FromStream(stmBLOBData); pictureBox1.Image = imgW } /// &summary& /// 在原图片基础上加载文字水印 /// &/summary& /// ¶m name="sender"&&/param& /// ¶m name="e"&&/param& private void button2_Click(object sender, EventArgs e) { Graphics GImage = Graphics.FromImage(imgWeight); addWatermarkText(GImage, "重量为60.00吨", "WM_BOTTOM_RIGHT", imgWeight.Width, imgWeight.Height); pictureBox1.Image = imgW } /// &summary& /// 在原图片基础上加载图片水印 /// &/summary& /// ¶m name="sender"&&/param& /// ¶m name="e"&&/param& private void button3_Click(object sender, EventArgs e) { Graphics GImage = Graphics.FromImage(imgWeight); addWatermarkImage(GImage, @"C:\Documents and Settings\Administrator\桌面\Mark.png", "WM_TOP_LEFT", imgWeight.Width, imgWeight.Height); pictureBox1.Image = imgW } /// &summary& /// 生成图片缩略图 /// &/summary& /// ¶m name="sender"&&/param& /// ¶m name="e"&&/param& private void button4_Click(object sender, EventArgs e) { GreateMiniImage(@"C:\Documents and Settings\Administrator\桌面\Source.jpg", @"C:\Documents and Settings\Administrator\桌面\Small.png", 100, 200); } /// &summary& /// 加水印文字 /// &/summary& /// ¶m name="picture"&imge 对象&/param& /// ¶m name="_watermarkText"&水印文字内容&/param& /// ¶m name="_watermarkPosition"&水印位置&/param& /// ¶m name="_width"&被加水印图片的宽&/param& /// ¶m name="_height"&被加水印图片的高&/param& private void addWatermarkText(Graphics picture, string _watermarkText, string _watermarkPosition, int _width, int _height) { int[] sizes = new int[] { 16, 14, 12, 10, 8, 6, 4 }; Font crFont = SizeF crSize = new SizeF(); for (int i = 0; i & 7; i++) { crFont = new Font("arial", sizes[i], FontStyle.Bold); crSize = picture.MeasureString(_watermarkText, crFont); if ((ushort)crSize.Width & (ushort)_width)
} float xpos = 0; float ypos = 0; switch (_watermarkPosition) { case "WM_TOP_LEFT": xpos = ((float)_width * (float).01) + (crSize.Width / 2); ypos = (float)_height * (float).01;
case "WM_TOP_RIGHT": xpos = ((float)_width * (float).99) - (crSize.Width / 2); ypos = (float)_height * (float).01;
case "WM_BOTTOM_RIGHT": xpos = ((float)_width * (float).99) - (crSize.Width / 2); ypos = ((float)_height * (float).99) - crSize.H
case "WM_BOTTOM_LEFT": xpos = ((float)_width * (float).01) + (crSize.Width / 2); ypos = ((float)_height * (float).99) - crSize.H
} StringFormat StrFormat = new StringFormat(); StrFormat.Alignment = StringAlignment.C SolidBrush semiTransBrush2 = new SolidBrush(Color.FromArgb(153, 0, 0, 0)); picture.DrawString(_watermarkText, crFont, semiTransBrush2, xpos + 1, ypos + 1, StrFormat); SolidBrush semiTransBrush = new SolidBrush(Color.FromArgb(153, 255, 255, 255)); picture.DrawString(_watermarkText, crFont, semiTransBrush, xpos, ypos, StrFormat); semiTransBrush2.Dispose(); semiTransBrush.Dispose(); } /// &summary& /// 加水印图片 /// &/summary& /// ¶m name="picture"&imge 对象&/param& /// ¶m name="WaterMarkPicPath"&水印图片的地址&/param& /// ¶m name="_watermarkPosition"&水印位置&/param& /// ¶m name="_width"&被加水印图片的宽&/param& /// ¶m name="_height"&被加水印图片的高&/param& private void addWatermarkImage(Graphics picture, string WaterMarkPicPath, string _watermarkPosition, int _width, int _height) { Image watermark = new Bitmap(WaterMarkPicPath); ImageAttributes imageAttributes = 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 }; imageAttributes.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, 0.3f, 0.0f}, new float[] {0.0f, 0.0f, 0.0f, 0.0f, 1.0f} }; ColorMatrix colorMatrix = new ColorMatrix(colorMatrixElements); imageAttributes.SetColorMatrix(colorMatrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap); int xpos = 0; int ypos = 0; int WatermarkWidth = 0; int WatermarkHeight = 0; double bl = 1d; //计算水印图片的比率 //取背景的1/4宽度来比较 if ((_width & watermark.Width * 4) && (_height & watermark.Height * 4)) { bl = 1; } else if ((_width & watermark.Width * 4) && (_height & watermark.Height * 4)) { bl = Convert.ToDouble(_height / 4) / Convert.ToDouble(watermark.Height); } else if ((_width & watermark.Width * 4) && (_height & watermark.Height * 4)) { bl = Convert.ToDouble(_width / 4) / Convert.ToDouble(watermark.Width); } else { if ((_width * watermark.Height) & (_height * watermark.Width)) { bl = Convert.ToDouble(_height / 4) / Convert.ToDouble(watermark.Height); } else { bl = Convert.ToDouble(_width / 4) / Convert.ToDouble(watermark.Width); } } WatermarkWidth = Convert.ToInt32(watermark.Width * bl); WatermarkHeight = Convert.ToInt32(watermark.Height * bl); switch (_watermarkPosition) { case "WM_TOP_LEFT": xpos = 10; ypos = 10;
case "WM_TOP_RIGHT": xpos = _width - WatermarkWidth - 10; ypos = 10;
case "WM_BOTTOM_RIGHT": xpos = _width - WatermarkWidth - 10; ypos = _height - WatermarkHeight - 10;
case "WM_BOTTOM_LEFT": xpos = 10; ypos = _height - WatermarkHeight - 10;
} picture.DrawImage(watermark, new Rectangle(xpos, ypos, WatermarkWidth, WatermarkHeight), 0, 0, watermark.Width, watermark.Height, GraphicsUnit.Pixel, imageAttributes); watermark.Dispose(); imageAttributes.Dispose(); } /// &summary& /// 生成缩略图 /// &/summary& /// ¶m name="oldpath"&原图片地址&/param& /// ¶m name="newpath"&新图片地址&/param& /// ¶m name="tWidth"&缩略图的宽&/param& /// ¶m name="tHeight"&缩略图的高&/param& private void GreateMiniImage(string oldpath, string newpath, int tWidth, int tHeight) { try { System.Drawing.Image image = System.Drawing.Image.FromFile(oldpath); double bl = 1d; if ((image.Width &= image.Height) && (tWidth &= tHeight)) { bl = Convert.ToDouble(image.Height) / Convert.ToDouble(tHeight); } else if ((image.Width & image.Height) && (tWidth & tHeight)) { bl = Convert.ToDouble(image.Width) / Convert.ToDouble(tWidth); } else if ((image.Width &= image.Height) && (tWidth &= tHeight)) { if (image.Height / tHeight &= image.Width / tWidth) { bl = Convert.ToDouble(image.Width) / Convert.ToDouble(tWidth); } else { bl = Convert.ToDouble(image.Height) / Convert.ToDouble(tHeight); } } else { if (image.Height / tHeight &= image.Width / tWidth) { bl = Convert.ToDouble(image.Height) / Convert.ToDouble(tHeight); } else { bl = Convert.ToDouble(image.Width) / Convert.ToDouble(tWidth); } } Bitmap b = new Bitmap(image, Convert.ToInt32(image.Width / bl), Convert.ToInt32(image.Height / bl)); b.Save(newpath); b.Dispose(); image.Dispose(); } catch { } } } }
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