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Gaurav Taneja Great dreams... never even get out of the box. It takes an uncommon amount of guts to put your dreams on the line, to hold them up and say, "How good or how bad am I?" That's where courage comes in.
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.Drawing.Imaging; using System.Drawing.Drawing2D; /// /// Summary description for Watermark /// public class Watermark { public Watermark() { // // TODO: Add constructor logic here // } public void WaterM(string baseImagePath, string WaterMarkImagePath, string SaveImageNameNPath) { //define a string of text to use as the Copyright message string Copyright = ""; //create a image object containing the photograph to watermark //System.Drawing.Image imgPhoto = System.Drawing.Image.FromFile(WorkingDirectory + "\\watermark_photo.jpg"); System.Drawing.Image imgPhoto = System.Drawing.Image.FromFile(baseImagePath); int phWidth = imgPhoto.Width; int phHeight = imgPhoto.Height; //create a Bitmap the Size of the original photograph Bitmap bmPhoto = new Bitmap(phWidth, phHeight, PixelFormat.Format24bppRgb); bmPhoto.SetResolution(imgPhoto.HorizontalResolution, imgPhoto.VerticalResolution); //load the Bitmap into a Graphics object Graphics grPhoto = Graphics.FromImage(bmPhoto); //create a image object containing the watermark System.Drawing.Image imgWatermark = new Bitmap(WaterMarkImagePath); int wmWidth = imgWatermark.Width; int wmHeight = imgWatermark.Height; //------------------------------------------------------------ //Step #1 - Insert Copyright message //------------------------------------------------------------ //Set the rendering quality for this Graphics object grPhoto.SmoothingMode = SmoothingMode.AntiAlias; //Draws the photo Image object at original size to the graphics object. grPhoto.DrawImage( imgPhoto, // Photo Image object new Rectangle(0, 0, phWidth, phHeight), // Rectangle structure 0, // x-coordinate of the portion of the source image to draw. 0, // y-coordinate of the portion of the source image to draw. phWidth, // Width of the portion of the source image to draw. phHeight, // Height of the portion of the source image to draw. GraphicsUnit.Pixel); // Units of measure //------------------------------------------------------- //to maximize the size of the Copyright message we will //test multiple Font sizes to determine the largest posible //font we can use for the width of the Photograph //define an array of point sizes you would like to consider as possiblities //------------------------------------------------------- int[] sizes = new int[] { 16, 14, 12, 10, 8, 6, 4 }; Font crFont = null; SizeF crSize = new SizeF(); //Loop through the defined sizes checking the length of the Copyright string //If its length in pixles is less then the image width choose this Font size. for (int i = 0; i < 7; i++) { //set a Font object to Arial (i)pt, Bold crFont = new Font("arial", sizes[i], FontStyle.Bold); //Measure the Copyright string in this Font crSize = grPhoto.MeasureString(Copyright, crFont); if ((ushort)crSize.Width < (ushort)phWidth) break; } //Since all photographs will have varying heights, determine a //position 5% from the bottom of the image int yPixlesFromBottom = (int)(phHeight * .05); //Now that we have a point size use the Copyrights string height //to determine a y-coordinate to draw the string of the photograph float yPosFromBottom = ((phHeight - yPixlesFromBottom) - (crSize.Height / 2)); //Determine its x-coordinate by calculating the center of the width of the image float xCenterOfImg = (phWidth / 2); //Define the text layout by setting the text alignment to centered StringFormat StrFormat = new StringFormat(); StrFormat.Alignment = StringAlignment.Center; //define a Brush which is semi trasparent black (Alpha set to 153) SolidBrush semiTransBrush2 = new SolidBrush(Color.FromArgb(153, 0, 0, 0)); //Draw the Copyright string grPhoto.DrawString(Copyright, //string of text crFont, //font semiTransBrush2, //Brush new PointF(xCenterOfImg + 1, yPosFromBottom + 1), //Position StrFormat); //define a Brush which is semi trasparent white (Alpha set to 153) SolidBrush semiTransBrush = new SolidBrush(Color.FromArgb(153, 255, 255, 255)); //Draw the Copyright string a second time to create a shadow effect //Make sure to move this text 1 pixel to the right and down 1 pixel grPhoto.DrawString(Copyright, //string of text crFont, //font semiTransBrush, //Brush new PointF(xCenterOfImg, yPosFromBottom), //Position StrFormat); //Text alignment //------------------------------------------------------------ //Step #2 - Insert Watermark image //------------------------------------------------------------ //Create a Bitmap based on the previously modified photograph Bitmap Bitmap bmWatermark = new Bitmap(bmPhoto); // bmWatermark.SetResolution(imgPhoto.HorizontalResolution, imgPhoto.VerticalResolution); bmWatermark.SetResolution(imgPhoto.HorizontalResolution , imgPhoto.VerticalResolution ); //Load this Bitmap into a new Graphic Object Graphics grWatermark = Graphics.FromImage(bmWatermark); //To achieve a transulcent watermark we will apply (2) color //manipulations by defineing a ImageAttributes object and //seting (2) of its properties. ImageAttributes imageAttributes = new ImageAttributes(); //The first step in manipulating the watermark image is to replace //the background color with one that is trasparent (Alpha=0, R=0, G=0, B=0) //to do this we will use a Colormap and use this to define a RemapTable ColorMap colorMap = new ColorMap(); //My watermark was defined with a background of 100% Green this will //be the color we search for and replace with transparency colorMap.OldColor = Color.FromArgb(255, 0, 255, 0); colorMap.NewColor = Color.FromArgb(0, 0, 0, 0); ColorMap[] remapTable = { colorMap }; imageAttributes.SetRemapTable(remapTable, ColorAdjustType.Bitmap); //The second color manipulation is used to change the opacity of the //watermark. This is done by applying a 5x5 matrix that contains the //coordinates for the RGBA space. By setting the 3rd row and 3rd column //to 0.3f we achive a level of opacity 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 wmColorMatrix = new ColorMatrix(colorMatrixElements); imageAttributes.SetColorMatrix(wmColorMatrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap); //For this example we will place the watermark in the upper right //hand corner of the photograph. offset down 10 pixels and to the //left 10 pixles //int xPosOfWm = ((phWidth - wmWidth) - 10); //int yPosOfWm = 10; int xPosOfWm = (phWidth / 4);// -(wmWidth / 2); int yPosOfWm = (phHeight / 2) - (phHeight / 7); grWatermark.DrawImage(imgWatermark, //new Rectangle(xPosOfWm, yPosOfWm, wmWidth, wmHeight), //Set the detination Position //new Rectangle(xPosOfWm, yPosOfWm, 100, 100), //Set the detination Position new Rectangle(xPosOfWm, yPosOfWm, phWidth / 2, phHeight / 5), 0, // x-coordinate of the portion of the source image to draw. 0, // y-coordinate of the portion of the source image to draw. wmWidth, // Watermark Width wmHeight, // Watermark Height GraphicsUnit.Pixel, // Unit of measurment imageAttributes); //ImageAttributes Object //Replace the original photgraphs bitmap with the new Bitmap imgPhoto = bmWatermark; grPhoto.Dispose(); grWatermark.Dispose(); //save new image to file system. imgPhoto.Save(SaveImageNameNPath, ImageFormat.Jpeg); imgPhoto.Dispose(); imgWatermark.Dispose(); bmWatermark.Dispose(); bmWatermark = null; imgWatermark = null; imgPhoto = null; grWatermark = null; wmColorMatrix = null; colorMap = null; imageAttributes.Dispose(); imageAttributes = null; semiTransBrush2.Dispose(); semiTransBrush2 = null; semiTransBrush.Dispose(); semiTransBrush = null; bmPhoto.Dispose(); bmPhoto = null; } /// /// Create thumb of specific size /// /// /// /// /// /// public void NewImageSize(string strFromPath, string strToPath, string strExt, string RelWidth, string RelHeight) { try { System.Drawing.Image image = System.Drawing.Image.FromFile(strFromPath); // generate thumbnail System.Drawing.Image thumbImage = image.GetThumbnailImage(Convert.ToInt32(RelWidth), Convert.ToInt32(RelHeight), null, IntPtr.Zero); image.Dispose(); //save thumbnail if (strExt.ToString().ToUpper().Equals(".JPEG")) { thumbImage.Save(strToPath, ImageFormat.Jpeg); } if (strExt.ToString().ToUpper().Equals(".GIF")) { thumbImage.Save(strToPath, ImageFormat.Gif); } if (strExt.ToString().ToUpper().Equals(".PNG")) { thumbImage.Save(strToPath, ImageFormat.Png); } if (strExt.ToString().ToUpper().Equals(".TIFF")) { thumbImage.Save(strToPath, ImageFormat.Tiff); } if (strExt.ToString().ToUpper().Equals(".BMP")) { thumbImage.Save(strToPath, ImageFormat.Bmp); } if (strExt.ToString().ToUpper().Equals(".JPG")) { thumbImage.Save(strToPath, ImageFormat.Jpeg); } } catch { } } }
Posted on Friday, August 4, 2006 7:31 AM | Back to top

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