> Am 23.03.2016 um 11:08 schrieb Jean-Luc Arnaud <[email protected]>:
> 
> Ok, so let try another way...
> What kind of algorithm do you use for this Stegano function ? Your own 
> or a known one (i.e. LSB one)?

This GraphicsMagick plugin uses the code from GraphicsMagick library.

> Do you know a tool able to decode it? I just need to know if the 
> watermark is in the image and to decode it.

Well, I just added my own here:


  const AllChannels = &h111
  
  dim p as new Picture(500, 500, 32)
  
  dim w as new window1
  w.Title = "white"
  w.Backdrop = p
  
  dim l as Picture = LogoMBS(500)
  
  w = new window1
  w.Title = "Logo"
  w.Backdrop = l
  
  // adds picture. You will normally not see the modification
  dim x as Picture = p.AddSteganographyPictureMBS(AllChannels, l)
  
  w = new window1
  w.Title = "Logo hidden in white picture"
  w.Backdrop = x
  
  // as we store in lowest bit, this picture will look strange
  dim y as Picture = x.SteganographyPictureMBS(AllChannels)
  
  w = new window1
  w.Title = "Logo extracted"
  w.Backdrop = y



Sincerely
Christian

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