GIFText - Write Invisible Text To GIF Images
Version 1.2
GIFText is a vbscript class that lets you write text to GIF images. Invisible text can be stored in special built-in comment blocks, without affecting the actual display of the image.
How to use it:
Set oGif = New cGIFText
With oGif
'// File path to GIF
.FilePath = "C:\original.gif"
'// Save new GIF to this path
.SavePath = "C:\new.gif"
'// Should we delete all existing text?
.DeleteExisting = True
'// Write this text to the new GIF
.Comment = "This is my secret text."
'// Call the one public method.
bSuccess = .WriteGIFText
'// Return a human readable error message
If Len(.ErrorMessage) > 0 Then Response.Write .ErrorMessage
End With
Set oGif = Nothing
Notes:
- Not all GIF images contain these text blocks because they are optional.
- Any software capable of displaying GIF images, like web browsers, Photoshop, IrfanView etc, will ignore the comment blocks.
- See GIFFormat and GIFInfo for more information on the GIF file format.
LINKS:
- Hiding a message inside another message is called Steganography: http://en.wikipedia.org/wiki/Steganography
- http://www.w3.org/Graphics/GIF/spec-gif89a.txt
PRICE:
FREE.
