I want to know if exists a software (free or reasonably cheap) to
"watermarking" in invisible way photos (e.g. JPEG and TIF, possibly
16bit). Possibly for Windows 2000; I can use Linux, but for my
workflow I'd prefer do all in Windows.
I know the solution of Digimarc (bundle in Photoshop, for example) but
I cannot pay every year for the service, nor I need a service like
'spidering' in the Web to search my photos.

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Request for Question Clarification by hummer-ga on 12 Jul 2005 10:47 PDT

Hi bbujani,

Have you seen this tutorial?  

Invisible Watermark - The Tutorial
http://www.deviantart.com/view/8023576/

The GIMP
http://www.gimp.org/

Please let me know if this works for you.
Thanks,
hummer

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Clarification of Question by bbujani-ga on 12 Jul 2005 13:19 PDT

I have read the tutorial. I don't use GIMP, for my work almost every
day I use Photoshop. Tomorrow I'll try to reproduce all on Photoshop
(it seems possible, seeing quickly the tutorial), otherwise I'll
download GIMP and try to make the procedure in the same way of the
tutorial.
I'll say something tomorrow.
Thanks

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Request for Question Clarification by hummer-ga on 12 Jul 2005 13:36 PDT

The tutorial states, "The program used to exemplify is Adobe
Photoshop...", so you should be all set.  Good luck!  hummer

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Clarification of Question by bbujani-ga on 13 Jul 2005 00:27 PDT

Hi,
I try to do with Photoshop, and it works.
So, I am substantially satisfied from your answer.
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By the way, I wonder if it is possible to do the same with stegano methods.
What do you think about this ? (You are free to answer or not, in
any case I repeat I am substantially satisfied from your first answer).

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Request for Question Clarification by hummer-ga on 13 Jul 2005 08:07 PDT

Hi bbujani,

I'm glad to hear the tutorial worked for you! Thanks for letting me know.

I'm not an expert on steganography, but I would think that you're
going to have to buy steganography software to take invisible
watermarking a step further. There is a list of software here:

What is steganography?
http://www.tech-faq.com/steganography.shtml

Regards,
hummer

Hi bbujani,

Thank you for giving me the opportunity to post this as an answer.
Here is the link again to make it official.

Invisible Watermark - The Tutorial
http://www.deviantart.com/view/8023576/

Sincerely,
hummer

Google Search Terms Used: invisible watermarking watermarks

precise and very quickly !