Saturday 15 December 2012

Inserting Logo in Image using C#

Inserting Logo in Image using C#

if (fuProfilePic.HasFile)
                    //byte cmp = 2;
                    int imgSize = fuProfilePic.PostedFile.ContentLength;

                    string UniqueName = "MyImg" + DateTime.Now.Year.ToString() + DateTime.Now.Month.ToString() + DateTime.Now.Day.ToString() + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString();
                    string Path = "./Images/MyImages/" + UniqueName + fuProfilePic.FileName;
                    imageName = UniqueName + fuProfilePic.FileName;


                    //set a working directory
                    string WorkingDirectory = Server.MapPath("~/Images/MyImages/");

                    //define a string of text to use as the Copyright message
                    string Copyright = "TEXT TO WATERMARK";

                    //SAVE UPLOADED PHOTO

                    //create a image object containing the photograph to watermark
                    //Bitmap imgPhoto = (Bitmap)System.Drawing.Image.FromFile(WorkingDirectory + "watermark_photo.jpg", true); ACTUAL LINE OF CODE
                    Bitmap imgPhoto = new Bitmap(fuProfilePic.PostedFile.InputStream);
                    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
                    Bitmap imgWatermark = new Bitmap(WorkingDirectory + "logo.png");
                    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.
                        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)

                    //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

                    //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);
                    //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,

                    //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;

                        new Rectangle(xPosOfWm, yPosOfWm, wmWidth, wmHeight),  //Set the detination Position
                        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;

                    //save new image to file system.
                    imgPhoto.Save(WorkingDirectory + imageName, ImageFormat.Jpeg);

                    //change imageName
                    //imageName = "w".ToString() + imageName;


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