Invisible watermark using VB.NET RSS

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  gibtang

  Member

  65 Points

  13 Posts

  Invisible watermark using VB.NET

  Aug 19, 2006 03:09 PM|LINK

  I've a project where users can upload images onto the server and i have to add an invisible water mark into it. anyway,i've recommended that it would be better to purchase or use a 3rd party API that allows the invisible watermarking to be done using VB.NET. So i was wondering does anyone have any recommendations
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  hemanthlaxmi

  Member

  43 Points

  33 Posts

  Re: Invisible watermark using VB.NET

  Aug 23, 2011 04:25 AM|LINK

  With this function you can draw some text on an image, so that its easy to retrieve the position of text
  

  Imports System.Drawing.Imaging
  Imports System.Drawing
    
  Private Sub TextOnImage(ByVal OldImage As String, ByVal NewImage As String, ByVal Text As String, ByVal Format As ImageFormat, ByVal Font As Font, ByVal Color As Color, ByVal Position As Point)
    Dim TmpSize As System.Drawing.Size
    Dim Image As Image = System.Drawing.Image.FromFile(OldImage)
    Dim Brush As New SolidBrush(Color)
    
    'Read Image Dimensions
    TmpSize.Height = Image.Height
    TmpSize.Width = Image.Width
    
    'Create a new Bitmap Object
    Dim NewBitmap As New System.Drawing.Bitmap(Image, TmpSize)
    
    'Create a new Graphic Object
    Dim Graphic As System.Drawing.Graphics = System.Drawing.Graphics.FromImage(NewBitmap)
    
    'Draw String on Image
    Graphic.DrawString(Text, Font, Brush, Position)
    
    'Save new Image
    NewBitmap.Save(NewImage, Format)
    
    Graphic.Dispose()
    NewBitmap.Dispose()
  End Sub

  • Edited by hemanthlaxmi on Aug 23, 2011 04:25 AM