本文實例講述了C#給圖片添加水印的方法。分享給大家供大家參考，具體如下：
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 的摘要說明/// </summary>public class ImgWater{ public ImgWater() { // //TODO: 在此處添加構造函數邏輯 // } /// <summary> /// 圖片水印 /// </summary> /// <param name="ImgFile">原圖文件地址</param> /// <param name="WaterImg">水印圖片地址</param> /// <param name="sImgPath">水印圖片保存地址</param> /// <param name="Alpha">水印透明度設置</param> /// <param name="iScale">水印圖片在原圖上的顯示比例</param> /// <param name="intDistance">水印圖片在原圖上的邊距確定,以圖片的右邊和下邊為準,當設定的邊距超過一定大小后參數會自動失效</param> public bool zzsImgWater( string ImgFile , string WaterImg , string sImgPath , float Alpha , float iScale , int intDistance ) { try { //裝載圖片 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; //計算水印圖片尺寸 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); } //將原圖畫出來 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); //指定高質量顯示水印圖片質量 gWatermark.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; gWatermark.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; ImageAttributes imageAttributes = new ImageAttributes(); //設置兩種顏色,達到合成效果 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); //用矩陣設置水印圖片透明度 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); //確定水印邊距 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格式保存圖片 imgPhoto.Save(sImgPath, System.Drawing.Imaging.ImageFormat.Jpeg); //銷毀對象 gbmPhoto.Dispose(); gWatermark.Dispose(); imgPhoto.Dispose(); imgWatermark.Dispose(); return true; } catch { return false ; } } /**//// <summary> /// 文字水印 /// </summary> /// <param name="ImgFile">原圖文件地址</param> /// <param name="TextFont">水印文字</param> /// <param name="sImgPath">文字水印圖片保存地址</param> /// <param name="hScale">高度位置</param> /// <param name="widthFont">文字塊在圖片中所占寬度比例</param> /// <param name="Alpha">文字透明度 其數值的范圍在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 ); //建立字體大小的數組,循環找出適合圖片的水印字體 //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("微軟雅黑", sizes[i], FontStyle.Bold); crSize = gbmPhoto.MeasureString(TextFont, crFont); if ((ushort)crSize.Width < (ushort)imgPhotoWidth * widthFont) break; } //設置水印字體的位置 //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圖片水印 /// </summary> /// <param name="ImgFile">原圖文件地址</param> /// <param name="WaterImg">水印圖片地址</param> /// <param name="TextFont">水印文字信息</param> /// <param name="sImgPath">生存水印圖片后的保存地址</param> /// <param name="ImgAlpha">水印圖片的透明度</param> /// <param name="imgiScale">水印圖片在原圖上的顯示比例</param> /// <param name="intimgDistance">水印圖片在原圖上的邊距確定,以圖片的右邊和下邊為準,當設定的邊距超過一定大小后參數會自動失效</param> /// <param name="texthScale">水印文字高度位置,從圖片底部開始計算，0－1</param> /// <param name="textwidthFont">文字塊在圖片中所占寬度比例 0－1</param> /// <param name="textAlpha">文字透明度 其數值的范圍在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 ); //建立字體大小的數組,循環找出適合圖片的水印字體 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; } //設置水印字體的位置 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; //計算水印圖片尺寸 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); } //將原圖畫出來 Bitmap bmWatermark = new Bitmap(bmPhoto); bmWatermark.SetResolution(imgPhoto.HorizontalResolution, imgPhoto.VerticalResolution); Graphics gWatermark = Graphics.FromImage(bmWatermark); //指定高質量顯示水印圖片質量 gWatermark.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; gWatermark.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; System.Drawing.Imaging.ImageAttributes imageAttributes = new System.Drawing.Imaging.ImageAttributes(); //設置兩種顏色,達到合成效果 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); //用矩陣設置水印圖片透明度 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); //確定水印邊距 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格式保存圖片 imgPhoto.Save(sImgPath, System.Drawing.Imaging.ImageFormat.Jpeg); //銷毀對象 gbmPhoto.Dispose(); gWatermark.Dispose(); bmPhoto.Dispose(); imgPhoto.Dispose(); imgWatermark.Dispose(); } catch { } } /**//// <summary> /// 縮略圖 /// </summary> /// <param name="ImgFile">原圖文件地址</param> /// <param name="sImgPath">縮略圖保存地址</param> /// <param name="ResizeWidth">縮略圖寬度</param> /// <param name="ResizeHeight">縮略圖高度</param> /// <param name="BgColor">縮略圖背景顏色,注意,背景顏色只能指定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; } //計算縮放圖片尺寸 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> /// 圖片剪切 /// </summary> /// <param name="ImgFile">原圖文件地址</param> /// <param name="sImgPath">縮略圖保存地址</param> /// <param name="PointX">剪切起始點 X坐標</param> /// <param name="PointY">剪切起始點 Y坐標</param> /// <param name="CutWidth">剪切寬度</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); //此處只能用filestream，用 System.Drawing.Image則會報多過進程訪問文件的錯誤，會鎖定文件 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 { } }}希望本文所述對大家C#程序設計有所幫助。
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