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Truchet+text+pixellize+threshold=steganography
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Author:  ofnuts [ Tue Oct 25, 2011 5:02 pm ]
Post subject:  Truchet+text+pixellize+threshold=steganography

Still playing with the optimal Truchet pattern generation... So, the final technique is this:
- fill two layers, one with each pattern (I create the patterns in a side image and copy to clipboard)
- add layer mask to top one
- fill with noise (plasma or HSV noise, each has its advantages)
- Filter/blur/pixellize and give the size of the pattern
- use threshold tool to obtain equal number of black/white squares, or a pattern mix you like (this is the fun part, watching the pattern evolve while you drag the threshold handle).

But then there is a variant:
- add layer mask
- create text on layer mask
- pixellize & treshold as above.

Instant steganography. Can you spot the letter?

Attachment:
Hidden.png
Hidden.png [ 30.17 KiB | Viewed 3062 times ]


Hint: it's more visible if you look at your screen from a distance, and are a bit on the side (ideally 45 degrees).

Did I say subliminal messages in screen savers? No I didn't! Just plain squiggly lines, boss... and look, do you see anything else?

Author:  mahvin [ Tue Oct 25, 2011 5:40 pm ]
Post subject:  Re: Truchet+text+pixellize+threshold=steganography

Ahhh, got it now. Yes.

Author:  lylejk [ Tue Oct 25, 2011 6:01 pm ]
Post subject:  Re: Truchet+text+pixellize+threshold=steganography

Believe I see a G Ofnuts. Definitely cool. Recently did a Santa myself. lol

:)

Image

Author:  ofnuts [ Tue Oct 25, 2011 6:47 pm ]
Post subject:  Re: Truchet+text+pixellize+threshold=steganography

lylejk wrote:
Believe I see a G Ofnuts. Definitely cool. Recently did a Santa myself. lol

:)

Image

Yes that was a G.

How many pattern do you mix to obtain this result?

Author:  lylejk [ Tue Oct 25, 2011 10:46 pm ]
Post subject:  Re: Truchet+text+pixellize+threshold=steganography

I used the 4 patterns per the tutorial Ofnuts. I used GIMP's Posterize set to 4 to get the 4 selection patterns from the Santa target that I used (a clipart that I got and can't remember where). :)

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