how to add text in captured image which is capturing image from WPF webcam before saving into files?

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i m using wpf webcam for capturing picture.i want to add watermarking on every image before saving it into harddrive....

Posted 24-Oct-13 0:26am

Nitin Gupta1

Updated 24-Oct-13 0:35am

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Nitin Gupta1 24-Oct-13 6:33am

if anybody knows the way
pls tell me.

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Xiao Ling · Answer 1 · 2013-10-27T20:35:00

you can use RenderTargetBitmap http://msdn.microsoft.com/en-us/library/system.windows.media.imaging.rendertargetbitmap.aspx[^]

For example:

C#

// background
BitmapSource bgImage = new BitmapImage(new Uri(bgImagePath, UriKind.Relative));

// RenderTargetBitmap 
RenderTargetBitmap composeImage = new RenderTargetBitmap(bgImage.PixelWidth, bgImage.PixelHeight, bgImage.DpiX, bgImage.DpiY, PixelFormats.Default);

// signature
FormattedText signatureTxt = new FormattedText(signature,                                                  System.Globalization.CultureInfo.CurrentCulture,System.Windows.FlowDirection.LeftToRight,new Typeface(System.Windows.SystemFonts.MessageFontFamily, FontStyles.Normal, FontWeights.Normal, FontStretches.Normal),50,System.Windows.Media.Brushes.White);

// render
double x2 = (bgImage.Width/2 - signatureTxt.Width) / 2;
double y2 = y + headerImage.Height + 20;
drawingContext.DrawText(signatureTxt, new System.Windows.Point(x2, y2));
drawingContext.Close();
composeImage.Render(drawingVisual);

// save file
JpegBitmapEncoder bitmapEncoder = new JpegBitmapEncoder();
bitmapEncoder.Frames.Add(BitmapFrame.Create(composeImage));
string savePath = System.AppDomain.CurrentDomain.SetupInformation.ApplicationBase + @"\merged.jpg";
bitmapEncoder.Save(File.OpenWrite(Path.GetFileName(savePath)));