本文实例讲述了C#给图片添加水印的方法。分享给大家供大家参考,具体如下:
using System; using System.Data; using System.Configuration; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Web.UI.HtmlControls; using System.Drawing; using System.IO; using System.Drawing.Imaging; /// <summary> ///ImgWater 的摘要说明 /// </summary> public class ImgWater { public ImgWater() { // //TODO: 在此处添加构造函数逻辑 // } /// <summary> /// 图片水印 /// </summary> /// <param name="ImgFile">原图文件地址</param> /// <param name="WaterImg">水印图片地址</param> /// <param name="sImgPath">水印图片保存地址</param> /// <param name="Alpha">水印透明度设置</param> /// <param name="iScale">水印图片在原图上的显示比例</param> /// <param name="intDistance">水印图片在原图上的边距确定,以图片的右边和下边为准,当设定的边距超过一定大小后参数会自动失效</param> public bool zzsImgWater( string ImgFile , string WaterImg , string sImgPath , float Alpha , float iScale , int intDistance ) { try { //装载图片 FileStream fs = new FileStream(ImgFile, FileMode.Open); BinaryReader br = new BinaryReader(fs); byte[] bytes = br.ReadBytes((int)fs.Length); br.Close(); fs.Close(); MemoryStream ms = new MemoryStream(bytes); System.Drawing.Image imgPhoto = System.Drawing.Image.FromStream(ms); //System.Drawing.Image imgPhoto = System.Drawing.Image.FromFile(ImgFile); int imgPhotoWidth = imgPhoto.Width; int imgPhotoHeight = imgPhoto.Height; System.Drawing.Image imgWatermark = new Bitmap(WaterImg); int imgWatermarkWidth = imgWatermark.Width; int imgWatermarkHeight = imgWatermark.Height; //计算水印图片尺寸 decimal aScale = Convert.ToDecimal(iScale); decimal pScale = 0.05M; decimal MinScale = aScale - pScale; decimal MaxScale = aScale + pScale; int imgWatermarkWidthNew = imgWatermarkWidth; int imgWatermarkHeightNew = imgWatermarkHeight; if (imgPhotoWidth >= imgWatermarkWidth && imgPhotoHeight >= imgWatermarkHeight && imgPhotoWidth >= imgPhotoHeight) if (imgWatermarkWidth > imgWatermarkHeight) if ((MinScale <= Math.Round((Convert.ToDecimal(imgWatermarkWidth) / Convert.ToDecimal(imgPhotoWidth)), 7)) && (Math.Round((Convert.ToDecimal(imgWatermarkWidth) / Convert.ToDecimal(imgPhotoWidth)), 7) <= MaxScale)) { } else { imgWatermarkWidthNew = Convert.ToInt32(imgPhotoWidth * aScale); imgWatermarkHeightNew = Convert.ToInt32((imgPhotoWidth * aScale / imgWatermarkWidth) * imgWatermarkHeight); } else if ((MinScale <= Math.Round((Convert.ToDecimal(imgWatermarkHeight) / Convert.ToDecimal(imgPhotoHeight)), 7)) && (Math.Round((Convert.ToDecimal(imgWatermarkHeight) / Convert.ToDecimal(imgPhotoHeight)), 7) <= MaxScale)) { } else { imgWatermarkHeightNew = Convert.ToInt32(imgPhotoHeight * aScale); imgWatermarkWidthNew = Convert.ToInt32((imgPhotoHeight * aScale / imgWatermarkHeight) * imgWatermarkWidth); } if (imgWatermarkWidth >= imgPhotoWidth && imgWatermarkHeight >= imgPhotoHeight && imgWatermarkWidth >= imgWatermarkHeight) { imgWatermarkWidthNew = Convert.ToInt32(imgPhotoWidth * aScale); imgWatermarkHeightNew = Convert.ToInt32(((imgPhotoWidth * aScale) / imgWatermarkWidth) * imgWatermarkHeight); } if (imgWatermarkWidth >= imgPhotoWidth && imgWatermarkHeight <= imgPhotoHeight && imgPhotoWidth >= imgPhotoHeight) { imgWatermarkWidthNew = Convert.ToInt32(imgPhotoWidth * aScale); imgWatermarkHeightNew = Convert.ToInt32(((imgPhotoWidth * aScale) / imgWatermarkWidth) * imgWatermarkHeight); } if (imgWatermarkWidth <= imgPhotoWidth && imgWatermarkHeight >= imgPhotoHeight && imgPhotoWidth >= imgPhotoHeight) { imgWatermarkHeightNew = Convert.ToInt32(imgPhotoHeight * aScale); imgWatermarkWidthNew = Convert.ToInt32(((imgPhotoHeight * aScale) / imgWatermarkHeight) * imgWatermarkWidth); } if (imgPhotoWidth >= imgWatermarkWidth && imgPhotoHeight >= imgWatermarkHeight && imgPhotoWidth <= imgPhotoHeight) if (imgWatermarkWidth > imgWatermarkHeight) if ((MinScale <= Math.Round((Convert.ToDecimal(imgWatermarkWidth) / Convert.ToDecimal(imgPhotoWidth)), 7)) && (Math.Round((Convert.ToDecimal(imgWatermarkWidth) / Convert.ToDecimal(imgPhotoWidth)), 7) <= MaxScale)) { } else { imgWatermarkWidthNew = Convert.ToInt32(imgPhotoWidth * aScale); imgWatermarkHeightNew = Convert.ToInt32(((imgPhotoWidth * aScale) / imgWatermarkWidth) * imgWatermarkHeight); } else if ((MinScale <= Math.Round((Convert.ToDecimal(imgWatermarkHeight) / Convert.ToDecimal(imgPhotoHeight)), 7)) && (Math.Round((Convert.ToDecimal(imgWatermarkHeight) / Convert.ToDecimal(imgPhotoHeight)), 7) <= MaxScale)) { } else { imgWatermarkHeightNew = Convert.ToInt32(imgPhotoHeight * aScale); imgWatermarkWidthNew = Convert.ToInt32(((imgPhotoHeight * aScale) / imgWatermarkHeight) * imgWatermarkWidth); } if (imgWatermarkWidth >= imgPhotoWidth && imgWatermarkHeight >= imgPhotoHeight && imgWatermarkWidth <= imgWatermarkHeight) { imgWatermarkHeightNew = Convert.ToInt32(imgPhotoHeight * aScale); imgWatermarkWidthNew = Convert.ToInt32(((imgPhotoHeight * aScale) / imgWatermarkHeight) * imgWatermarkWidth); } if (imgWatermarkWidth >= imgPhotoWidth && imgWatermarkHeight <= imgPhotoHeight && imgPhotoWidth <= imgPhotoHeight) { imgWatermarkWidthNew = Convert.ToInt32(imgPhotoWidth * aScale); imgWatermarkHeightNew = Convert.ToInt32(((imgPhotoWidth * aScale) / imgWatermarkWidth) * imgWatermarkHeight); } if (imgWatermarkWidth <= imgPhotoWidth && imgWatermarkHeight >= imgPhotoHeight && imgPhotoWidth <= imgPhotoHeight) { imgWatermarkHeightNew = Convert.ToInt32(imgPhotoHeight * aScale); imgWatermarkWidthNew = Convert.ToInt32(((imgPhotoHeight * aScale) / imgWatermarkHeight) * imgWatermarkWidth); } //将原图画出来 Bitmap bmPhoto = new Bitmap(imgPhotoWidth, imgPhotoHeight, System.Drawing.Imaging.PixelFormat.Format24bppRgb); bmPhoto.SetResolution(72, 72); Graphics gbmPhoto = Graphics.FromImage(bmPhoto); gbmPhoto.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; gbmPhoto.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; gbmPhoto.Clear(Color.White); gbmPhoto.DrawImage( imgPhoto , new Rectangle(0, 0, imgPhotoWidth, imgPhotoHeight) , 0 , 0 , imgPhotoWidth , imgPhotoHeight , GraphicsUnit.Pixel ); Bitmap bmWatermark = new Bitmap(bmPhoto); bmWatermark.SetResolution(imgPhoto.HorizontalResolution, imgPhoto.VerticalResolution); Graphics gWatermark = Graphics.FromImage(bmWatermark); //指定高质量显示水印图片质量 gWatermark.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; gWatermark.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; ImageAttributes imageAttributes = new ImageAttributes(); //设置两种颜色,达到合成效果 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, System.Drawing.Imaging.ColorAdjustType.Bitmap); //用矩阵设置水印图片透明度 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, Alpha, 0.0f}, new float[] {0.0f, 0.0f, 0.0f, 0.0f, 1.0f} }; System.Drawing.Imaging.ColorMatrix wmColorMatrix = new System.Drawing.Imaging.ColorMatrix(colorMatrixElements); imageAttributes.SetColorMatrix(wmColorMatrix, System.Drawing.Imaging.ColorMatrixFlag.Default, System.Drawing.Imaging.ColorAdjustType.Bitmap); //确定水印边距 int xPos = imgPhotoWidth - imgWatermarkWidthNew; int yPos = imgPhotoHeight - imgWatermarkHeightNew; int xPosOfWm = 0; int yPosOfWm = 0; if (xPos > intDistance) xPosOfWm = xPos - intDistance; else xPosOfWm = xPos; if (yPos > intDistance) yPosOfWm = yPos - intDistance; else yPosOfWm = yPos; gWatermark.DrawImage( imgWatermark , new Rectangle(xPosOfWm, yPosOfWm, imgWatermarkWidthNew, imgWatermarkHeightNew) , 0 , 0 , imgWatermarkWidth , imgWatermarkHeight , GraphicsUnit.Pixel , imageAttributes ); imgPhoto = bmWatermark; //以jpg格式保存图片 imgPhoto.Save(sImgPath, System.Drawing.Imaging.ImageFormat.Jpeg); //销毁对象 gbmPhoto.Dispose(); gWatermark.Dispose(); imgPhoto.Dispose(); imgWatermark.Dispose(); return true; } catch { return false ; } } /**//// <summary> /// 文字水印 /// </summary> /// <param name="ImgFile">原图文件地址</param> /// <param name="TextFont">水印文字</param> /// <param name="sImgPath">文字水印图片保存地址</param> /// <param name="hScale">高度位置</param> /// <param name="widthFont">文字块在图片中所占宽度比例</param> /// <param name="Alpha">文字透明度 其数值的范围在0到255</param> public bool zzsTextWater( string ImgFile , string TextFont , string sImgPath , float hScale , float widthFont , int Alpha ) { try { FileStream fs = new FileStream(ImgFile, FileMode.Open); BinaryReader br = new BinaryReader(fs); byte[] bytes = br.ReadBytes((int)fs.Length); br.Close(); fs.Close(); MemoryStream ms = new MemoryStream(bytes); System.Drawing.Image imgPhoto = System.Drawing.Image.FromStream(ms); //System.Drawing.Image imgPhoto = System.Drawing.Image.FromFile(ImgFile); int imgPhotoWidth = imgPhoto.Width; int imgPhotoHeight = imgPhoto.Height; Bitmap bmPhoto = new Bitmap(imgPhotoWidth, imgPhotoHeight, System.Drawing.Imaging.PixelFormat.Format24bppRgb); bmPhoto.SetResolution(72, 72); Graphics gbmPhoto = Graphics.FromImage(bmPhoto); gbmPhoto.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; gbmPhoto.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; gbmPhoto.DrawImage( imgPhoto , new Rectangle(0, 0, imgPhotoWidth, imgPhotoHeight) , 0 , 0 , imgPhotoWidth , imgPhotoHeight , GraphicsUnit.Pixel ); //建立字体大小的数组,循环找出适合图片的水印字体 //int[] sizes = new int[] { 1000, 800, 700, 650, 600, 560, 540, 500, 450, 400, 380, 360, 340, 320, 300, 280, 260, 240, 220, 200, 180, 160, 140, 120, 100, 80, 72, 64, 48, 32, 28, 26, 24, 20, 28, 16, 14, 12, 10, 8, 6, 4, 2 }; int[] sizes = new int[] { 28, 26, 24, 20, 16, 14, 12 }; System.Drawing.Font crFont = null; System.Drawing.SizeF crSize = new SizeF(); for (int i = 0; i < 7; i++) { crFont = new Font("微软雅黑", sizes[i], FontStyle.Bold); crSize = gbmPhoto.MeasureString(TextFont, crFont); if ((ushort)crSize.Width < (ushort)imgPhotoWidth * widthFont) break; } //设置水印字体的位置 //int yPixlesFromBottom = (int)(imgPhotoHeight * hScale); //float yPosFromBottom = ((imgPhotoHeight - yPixlesFromBottom) - (crSize.Height / 2)); //float xCenterOfImg = (imgPhotoWidth * 1 / 2); float yPosFromBottom = imgPhotoHeight *0.85f; float xCenterOfImg = imgPhotoWidth * 0.8f; //if (xCenterOfImg<crSize.Height) // xCenterOfImg = (imgPhotoWidth * (1 - (crSize.Height)/ imgPhotoWidth)); System.Drawing.StringFormat StrFormat = new System.Drawing.StringFormat(); StrFormat.Alignment = System.Drawing.StringAlignment.Center; // System.Drawing.SolidBrush semiTransBrush2 = new System.Drawing.SolidBrush(Color.FromArgb(Alpha, 0, 0, 0)); gbmPhoto.DrawString( TextFont , crFont , semiTransBrush2 , new System.Drawing.PointF(xCenterOfImg + 1, yPosFromBottom + 1) , StrFormat ); System.Drawing.SolidBrush semiTransBrush = new System.Drawing.SolidBrush(Color.FromArgb(Alpha, 255, 255, 255)); //gbmPhoto.FillRectangle(semiTransBrush2, new RectangleF(new PointF(xCenterOfImg - crSize.Width / 2, yPosFromBottom - 4), crSize)); gbmPhoto.DrawString( TextFont , crFont , semiTransBrush , new System.Drawing.PointF(xCenterOfImg, yPosFromBottom) , StrFormat ); bmPhoto.Save(sImgPath, System.Drawing.Imaging.ImageFormat.Jpeg); gbmPhoto.Dispose(); imgPhoto.Dispose(); bmPhoto.Dispose(); return true; } catch { return false; } } /**//// <summary> /// 文字和Logo图片水印 /// </summary> /// <param name="ImgFile">原图文件地址</param> /// <param name="WaterImg">水印图片地址</param> /// <param name="TextFont">水印文字信息</param> /// <param name="sImgPath">生存水印图片后的保存地址</param> /// <param name="ImgAlpha">水印图片的透明度</param> /// <param name="imgiScale">水印图片在原图上的显示比例</param> /// <param name="intimgDistance">水印图片在原图上的边距确定,以图片的右边和下边为准,当设定的边距超过一定大小后参数会自动失效</param> /// <param name="texthScale">水印文字高度位置,从图片底部开始计算,0-1</param> /// <param name="textwidthFont">文字块在图片中所占宽度比例 0-1</param> /// <param name="textAlpha">文字透明度 其数值的范围在0到255</param> public void zzsImgTextWater( string ImgFile , string WaterImg , string TextFont , string sImgPath , float ImgAlpha , float imgiScale , int intimgDistance , float texthScale , float textwidthFont , int textAlpha ) { try { FileStream fs = new FileStream(ImgFile, FileMode.Open); BinaryReader br = new BinaryReader(fs); byte[] bytes = br.ReadBytes((int)fs.Length); br.Close(); fs.Close(); MemoryStream ms = new MemoryStream(bytes); System.Drawing.Image imgPhoto = System.Drawing.Image.FromStream(ms); //System.Drawing.Image imgPhoto = System.Drawing.Image.FromFile(ImgFile); int imgPhotoWidth = imgPhoto.Width; int imgPhotoHeight = imgPhoto.Height; Bitmap bmPhoto = new Bitmap(imgPhotoWidth, imgPhotoHeight, System.Drawing.Imaging.PixelFormat.Format24bppRgb); bmPhoto.SetResolution(72, 72); Graphics gbmPhoto = Graphics.FromImage(bmPhoto); gbmPhoto.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; gbmPhoto.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; gbmPhoto.DrawImage( imgPhoto , new Rectangle(0, 0, imgPhotoWidth, imgPhotoHeight) , 0 , 0 , imgPhotoWidth , imgPhotoHeight , GraphicsUnit.Pixel ); //建立字体大小的数组,循环找出适合图片的水印字体 int[] sizes = new int[] { 1000, 800, 700, 650, 600, 560, 540, 500, 450, 400, 380, 360, 340, 320, 300, 280, 260, 240, 220, 200, 180, 160, 140, 120, 100, 80, 72, 64, 48, 32, 28, 26, 24, 20, 28, 16, 14, 12, 10, 8, 6, 4, 2 }; System.Drawing.Font crFont = null; System.Drawing.SizeF crSize = new SizeF(); for (int i = 0; i < 43; i++) { crFont = new Font("arial", sizes[i], FontStyle.Bold); crSize = gbmPhoto.MeasureString(TextFont, crFont); if ((ushort)crSize.Width < (ushort)imgPhotoWidth * textwidthFont) break; } //设置水印字体的位置 int yPixlesFromBottom = (int)(imgPhotoHeight * texthScale); float yPosFromBottom = ((imgPhotoHeight - yPixlesFromBottom) - (crSize.Height / 2)); float xCenterOfImg = (imgPhotoWidth * 1 / 2); System.Drawing.StringFormat StrFormat = new System.Drawing.StringFormat(); StrFormat.Alignment = System.Drawing.StringAlignment.Center; // System.Drawing.SolidBrush semiTransBrush2 = new System.Drawing.SolidBrush(Color.FromArgb(textAlpha, 0, 0, 0)); gbmPhoto.DrawString( TextFont , crFont , semiTransBrush2 , new System.Drawing.PointF(xCenterOfImg + 1, yPosFromBottom + 1) , StrFormat ); System.Drawing.SolidBrush semiTransBrush = new System.Drawing.SolidBrush(Color.FromArgb(textAlpha, 255, 255, 255)); gbmPhoto.DrawString( TextFont , crFont , semiTransBrush , new System.Drawing.PointF(xCenterOfImg, yPosFromBottom) , StrFormat ); System.Drawing.Image imgWatermark = new Bitmap(WaterImg); int imgWatermarkWidth = imgWatermark.Width; int imgWatermarkHeight = imgWatermark.Height; //计算水印图片尺寸 decimal aScale = Convert.ToDecimal(imgiScale); decimal pScale = 0.05M; decimal MinScale = aScale - pScale; decimal MaxScale = aScale + pScale; int imgWatermarkWidthNew = imgWatermarkWidth; int imgWatermarkHeightNew = imgWatermarkHeight; if (imgPhotoWidth >= imgWatermarkWidth && imgPhotoHeight >= imgWatermarkHeight && imgPhotoWidth >= imgPhotoHeight) if (imgWatermarkWidth > imgWatermarkHeight) if ((MinScale <= Math.Round((Convert.ToDecimal(imgWatermarkWidth) / Convert.ToDecimal(imgPhotoWidth)), 7)) && (Math.Round((Convert.ToDecimal(imgWatermarkWidth) / Convert.ToDecimal(imgPhotoWidth)), 7) <= MaxScale)) { } else { imgWatermarkWidthNew = Convert.ToInt32(imgPhotoWidth * aScale); imgWatermarkHeightNew = Convert.ToInt32((imgPhotoWidth * aScale / imgWatermarkWidth) * imgWatermarkHeight); } else if ((MinScale <= Math.Round((Convert.ToDecimal(imgWatermarkHeight) / Convert.ToDecimal(imgPhotoHeight)), 7)) && (Math.Round((Convert.ToDecimal(imgWatermarkHeight) / Convert.ToDecimal(imgPhotoHeight)), 7) <= MaxScale)) { } else { imgWatermarkHeightNew = Convert.ToInt32(imgPhotoHeight * aScale); imgWatermarkWidthNew = Convert.ToInt32((imgPhotoHeight * aScale / imgWatermarkHeight) * imgWatermarkWidth); } if (imgWatermarkWidth >= imgPhotoWidth && imgWatermarkHeight >= imgPhotoHeight && imgWatermarkWidth >= imgWatermarkHeight) { imgWatermarkWidthNew = Convert.ToInt32(imgPhotoWidth * aScale); imgWatermarkHeightNew = Convert.ToInt32(((imgPhotoWidth * aScale) / imgWatermarkWidth) * imgWatermarkHeight); } if (imgWatermarkWidth >= imgPhotoWidth && imgWatermarkHeight <= imgPhotoHeight && imgPhotoWidth >= imgPhotoHeight) { imgWatermarkWidthNew = Convert.ToInt32(imgPhotoWidth * aScale); imgWatermarkHeightNew = Convert.ToInt32(((imgPhotoWidth * aScale) / imgWatermarkWidth) * imgWatermarkHeight); } if (imgWatermarkWidth <= imgPhotoWidth && imgWatermarkHeight >= imgPhotoHeight && imgPhotoWidth >= imgPhotoHeight) { imgWatermarkHeightNew = Convert.ToInt32(imgPhotoHeight * aScale); imgWatermarkWidthNew = Convert.ToInt32(((imgPhotoHeight * aScale) / imgWatermarkHeight) * imgWatermarkWidth); } if (imgPhotoWidth >= imgWatermarkWidth && imgPhotoHeight >= imgWatermarkHeight && imgPhotoWidth <= imgPhotoHeight) if (imgWatermarkWidth > imgWatermarkHeight) if ((MinScale <= Math.Round((Convert.ToDecimal(imgWatermarkWidth) / Convert.ToDecimal(imgPhotoWidth)), 7)) && (Math.Round((Convert.ToDecimal(imgWatermarkWidth) / Convert.ToDecimal(imgPhotoWidth)), 7) <= MaxScale)) { } else { imgWatermarkWidthNew = Convert.ToInt32(imgPhotoWidth * aScale); imgWatermarkHeightNew = Convert.ToInt32(((imgPhotoWidth * aScale) / imgWatermarkWidth) * imgWatermarkHeight); } else if ((MinScale <= Math.Round((Convert.ToDecimal(imgWatermarkHeight) / Convert.ToDecimal(imgPhotoHeight)), 7)) && (Math.Round((Convert.ToDecimal(imgWatermarkHeight) / Convert.ToDecimal(imgPhotoHeight)), 7) <= MaxScale)) { } else { imgWatermarkHeightNew = Convert.ToInt32(imgPhotoHeight * aScale); imgWatermarkWidthNew = Convert.ToInt32(((imgPhotoHeight * aScale) / imgWatermarkHeight) * imgWatermarkWidth); } if (imgWatermarkWidth >= imgPhotoWidth && imgWatermarkHeight >= imgPhotoHeight && imgWatermarkWidth <= imgWatermarkHeight) { imgWatermarkHeightNew = Convert.ToInt32(imgPhotoHeight * aScale); imgWatermarkWidthNew = Convert.ToInt32(((imgPhotoHeight * aScale) / imgWatermarkHeight) * imgWatermarkWidth); } if (imgWatermarkWidth >= imgPhotoWidth && imgWatermarkHeight <= imgPhotoHeight && imgPhotoWidth <= imgPhotoHeight) { imgWatermarkWidthNew = Convert.ToInt32(imgPhotoWidth * aScale); imgWatermarkHeightNew = Convert.ToInt32(((imgPhotoWidth * aScale) / imgWatermarkWidth) * imgWatermarkHeight); } if (imgWatermarkWidth <= imgPhotoWidth && imgWatermarkHeight >= imgPhotoHeight && imgPhotoWidth <= imgPhotoHeight) { imgWatermarkHeightNew = Convert.ToInt32(imgPhotoHeight * aScale); imgWatermarkWidthNew = Convert.ToInt32(((imgPhotoHeight * aScale) / imgWatermarkHeight) * imgWatermarkWidth); } //将原图画出来 Bitmap bmWatermark = new Bitmap(bmPhoto); bmWatermark.SetResolution(imgPhoto.HorizontalResolution, imgPhoto.VerticalResolution); Graphics gWatermark = Graphics.FromImage(bmWatermark); //指定高质量显示水印图片质量 gWatermark.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; gWatermark.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; System.Drawing.Imaging.ImageAttributes imageAttributes = new System.Drawing.Imaging.ImageAttributes(); //设置两种颜色,达到合成效果 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); //用矩阵设置水印图片透明度 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, ImgAlpha, 0.0f}, new float[] {0.0f, 0.0f, 0.0f, 0.0f, 1.0f} }; System.Drawing.Imaging.ColorMatrix wmColorMatrix = new System.Drawing.Imaging.ColorMatrix(colorMatrixElements); imageAttributes.SetColorMatrix(wmColorMatrix, System.Drawing.Imaging.ColorMatrixFlag.Default, System.Drawing.Imaging.ColorAdjustType.Bitmap); //确定水印边距 int xPos = imgPhotoWidth - imgWatermarkWidthNew; int yPos = imgPhotoHeight - imgWatermarkHeightNew; int xPosOfWm = 0; int yPosOfWm = 0; if (xPos > intimgDistance) xPosOfWm = xPos - intimgDistance; else xPosOfWm = xPos; if (yPos > intimgDistance) yPosOfWm = yPos - intimgDistance; else yPosOfWm = yPos; gWatermark.DrawImage( imgWatermark , new Rectangle(xPosOfWm, yPosOfWm, imgWatermarkWidthNew, imgWatermarkHeightNew) , 0 , 0 , imgWatermarkWidth , imgWatermarkHeight , GraphicsUnit.Pixel , imageAttributes ); imgPhoto = bmWatermark; //以jpg格式保存图片 imgPhoto.Save(sImgPath, System.Drawing.Imaging.ImageFormat.Jpeg); //销毁对象 gbmPhoto.Dispose(); gWatermark.Dispose(); bmPhoto.Dispose(); imgPhoto.Dispose(); imgWatermark.Dispose(); } catch { } } /**//// <summary> /// 缩略图 /// </summary> /// <param name="ImgFile">原图文件地址</param> /// <param name="sImgPath">缩略图保存地址</param> /// <param name="ResizeWidth">缩略图宽度</param> /// <param name="ResizeHeight">缩略图高度</param> /// <param name="BgColor">缩略图背景颜色,注意,背景颜色只能指定KnownColor中的值,如blue,red,green等</param> public bool zzsResizeImg( string ImgFile , string sImgPath , int ResizeWidth , int ResizeHeight , string BgColor ) { try { FileStream fs = new FileStream(ImgFile, FileMode.Open); BinaryReader br = new BinaryReader(fs); byte[] bytes = br.ReadBytes((int)fs.Length); br.Close(); fs.Close(); MemoryStream ms = new MemoryStream(bytes); System.Drawing.Image imgPhoto = System.Drawing.Image.FromStream(ms); //System.Drawing.Image imgPhoto = System.Drawing.Image.FromFile(ImgFile); int imgPhotoWidth = imgPhoto.Width; int imgPhotoHeight = imgPhoto.Height; int startX = 0; int StartY = 0; int NewWidth = 0; int NewHeight = 0; if (imgPhotoWidth >= ResizeWidth && imgPhotoHeight >= ResizeHeight) { NewWidth = ResizeWidth; NewHeight = Convert.ToInt32(imgPhotoHeight * Math.Round(Convert.ToDecimal(ResizeWidth) / Convert.ToDecimal(imgPhotoWidth), 10)); startX = 0; StartY = (ResizeHeight - NewHeight) / 2; } if (ResizeWidth > imgPhotoWidth && ResizeHeight < imgPhotoHeight) { NewHeight = ResizeHeight; NewWidth = Convert.ToInt32(imgPhotoWidth * Math.Round(Convert.ToDecimal(ResizeHeight) / Convert.ToDecimal(imgPhotoHeight), 10)); startX = (ResizeWidth - NewWidth) / 2; StartY = 0; } if (ResizeWidth < imgPhotoWidth && ResizeHeight > imgPhotoHeight) { NewWidth = ResizeWidth; NewHeight = Convert.ToInt32(imgPhotoHeight * Math.Round(Convert.ToDecimal(ResizeWidth) / Convert.ToDecimal(imgPhotoWidth), 10)); startX = 0; StartY = (ResizeHeight - NewHeight) / 2; } if (imgPhotoWidth < ResizeWidth && imgPhotoHeight < ResizeHeight) { NewWidth = imgPhotoWidth; NewHeight = imgPhotoHeight; startX = (ResizeWidth - imgPhotoWidth) / 2; StartY = (ResizeHeight - imgPhotoHeight) / 2; } //计算缩放图片尺寸 Bitmap bmPhoto = new Bitmap(ResizeWidth, ResizeHeight, System.Drawing.Imaging.PixelFormat.Format24bppRgb); bmPhoto.SetResolution(72, 72); Graphics gbmPhoto = Graphics.FromImage(bmPhoto); gbmPhoto.Clear(Color.FromName(BgColor)); gbmPhoto.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; gbmPhoto.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; gbmPhoto.DrawImage( imgPhoto , new Rectangle(startX, StartY, NewWidth, NewHeight) , new Rectangle(0, 0, imgPhotoWidth, imgPhotoHeight) , GraphicsUnit.Pixel ); bmPhoto.Save(sImgPath, System.Drawing.Imaging.ImageFormat.Jpeg); imgPhoto.Dispose(); gbmPhoto.Dispose(); bmPhoto.Dispose(); ms.Close(); return true; } catch { return false; } } /**//// <summary> /// 图片剪切 /// </summary> /// <param name="ImgFile">原图文件地址</param> /// <param name="sImgPath">缩略图保存地址</param> /// <param name="PointX">剪切起始点 X坐标</param> /// <param name="PointY">剪切起始点 Y坐标</param> /// <param name="CutWidth">剪切宽度</param> /// <param name="CutHeight">剪切高度</param> public bool zzsCutImg(string ImgFile, string sImgPath, int PointX, int PointY, int CutWidth, int CutHeight) { FileStream fs = new FileStream(ImgFile, FileMode.Open); BinaryReader br = new BinaryReader(fs); try { byte[] bytes = br.ReadBytes((int)fs.Length); br.Close(); fs.Close(); MemoryStream ms = new MemoryStream(bytes); System.Drawing.Image imgPhoto = System.Drawing.Image.FromStream(ms); //System.Drawing.Image imgPhoto = System.Drawing.Image.FromFile(ImgFile); //此处只能用filestream,用 System.Drawing.Image则会报多过进程访问文件的错误,会锁定文件 Bitmap bmPhoto = new Bitmap(CutWidth, CutHeight, System.Drawing.Imaging.PixelFormat.Format24bppRgb); bmPhoto.SetResolution(72, 72); Graphics gbmPhoto = Graphics.FromImage(bmPhoto); gbmPhoto.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; gbmPhoto.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; gbmPhoto.DrawImage( imgPhoto , new Rectangle(0, 0, CutWidth, CutHeight) , new Rectangle(PointX, PointY, CutHeight, CutHeight) , GraphicsUnit.Pixel ); bmPhoto.Save(sImgPath, System.Drawing.Imaging.ImageFormat.Jpeg); imgPhoto.Dispose(); gbmPhoto.Dispose(); bmPhoto.Dispose(); ms.Close(); return true; } catch { return false; } finally { } } }
希望本文所述对大家C#程序设计有所帮助。
主要内容:ImageDraw,ImageFont,添加图片水印为图片添加水印能够在一定程度上避免其他人滥用您的图片,这是保护图片版权的一种有效方式。因此,当您在微博、或者博客等一些公众平台分享图片的时候,建议您为自己的图片添加一个水印,来证明这张图片属于您。 添加水印的方式的有很多种,比如通过一些图像处理软件,或者手机美图软件都可以实现添加水印的操作,但是这种操作比较复杂,甚至有些软件还不是免费的。 Pillow 库提供了添加水印的方法,操作简单,易学、易用
本文向大家介绍IOS给图片添加水印(两种方式),包括了IOS给图片添加水印(两种方式)的使用技巧和注意事项,需要的朋友参考一下 为了防止自己辛苦做的项目被别人盗走,采取图片添加水印,在此表示图片的独一无二。加水印不是在上面添加几个Label,而是我们把字画到图片上成为一个整体,下面小编给大家分享IOS给图片添加水印(两种方式)。 提供一个方法,此方法只需要传递一个要加水印的图片和水印的内容就达到效
本文向大家介绍php给图片加文字水印,包括了php给图片加文字水印的使用技巧和注意事项,需要的朋友参考一下 注释非常的详细了,这里就不多废话了 以上所述就是本文的全部内容了,希望大家能够喜欢。
本文向大家介绍C#如何给word文档添加水印,包括了C#如何给word文档添加水印的使用技巧和注意事项,需要的朋友参考一下 和PDF一样,在word中,水印也分为图片水印和文本水印,给文档添加图片水印可以使文档变得更为美观,更具有吸引力。文本水印则可以保护文档,提醒别人该文档是受版权保护的,不能随意抄袭。前面我分享了如何给PDF添加水印,有人问我如何给word文档添加水印,今天正好有空,就记录一下
本文向大家介绍C#如何给PDF文件添加水印,包括了C#如何给PDF文件添加水印的使用技巧和注意事项,需要的朋友参考一下 水印种类及功能介绍 PDF水印分为两种:文本水印和图片水印。文本水印一般被用在商业领域,提醒读者该文档是受版权保护的,其他人不能抄袭或者免费使用。除了这个特征,水印还可以用来标记这个文档 的一些基本状态信息,例如是草稿状态还是最终版本?图片水印是美化PDF文件的一个很好的选择,
本文向大家介绍如何使用PHP给图片加水印,包括了如何使用PHP给图片加水印的使用技巧和注意事项,需要的朋友参考一下 为了防止辛苦做出来的图片被盗用,很多照片都会加上水印,可以直接用图片工具添加水印再上传,但PHP中就可以实现给图片加水印的功能,本文章向码农们介绍 php 给图片加水印的两种方法,感兴趣的码农可以参考一下本文章的源代码。 方法一:PHP最简单的加水印方法 方法二:php给图片加文字水