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10-02-2014, 10:55 PM
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#1 |
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Registered User
Industry Role:
Join Date: Oct 2014
Posts: 5
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Hidden watermarks? (how to)
Hello guys! This is my first post around here. I know some people do this, but I have no idea how to achieve it. Say I am selling a gallery online (100 pics). Can I save a small "mark" on the code of a random picture (which would be automatically placed when someone buys the set), which could later be used to trace whoever is sharing the gallery? Its what they call a hidden watermark.
How do you guys think this could be achived?  Thanks so much for your help!!!  - Monika |
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10-03-2014, 05:19 AM
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#2 |
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Confirmed User
Industry Role:
Join Date: Mar 2012
Location: Soon On Mars
Posts: 4,082
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welcome to gfy, here's a bump
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10-03-2014, 08:13 AM
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#3 |
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Registered User
Industry Role:
Join Date: Sep 2014
Posts: 57
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it is not so hard
https://www.youtube.com/watch?v=Xgehvx3oKc0 |
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10-03-2014, 08:52 AM
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#4 | |
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Registered User
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Join Date: Oct 2014
Posts: 5
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Quote:
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10-03-2014, 08:54 AM
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#5 | |
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Registered User
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Join Date: Oct 2014
Posts: 5
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Quote:
 I don't want to remove a watermark. I want to place a watermark (different for each customer who downloads the gallery). It has to be a hidden watermark (can not be seen in the picture, but it is hidden in the binary code itself). |
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10-03-2014, 12:04 PM
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#6 |
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AdultCoding.com PHP Freak
Industry Role:
Join Date: Sep 2014
Location: Austria (Europe)
Posts: 58
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I know this thread is pretty old, but have a look at it. There's some really useful information in there: /showthread.php?t=990150
__________________
AdultCoding.com Webdevelopment - info [smth] adultcoding [smthelse] com - Skype: AdultCoding Individual PHP development following the latest standards in the web industry. Get in touch for a custom offer, now! |
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10-04-2014, 12:04 AM
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#7 | |
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Registered User
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Join Date: Oct 2014
Posts: 5
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10-04-2014, 03:47 AM
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#8 |
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Confirmed User
Join Date: Dec 2007
Location: Chatsworth, CA
Posts: 1,964
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I believe you are referring to "steganography". You basically manipulate the image in a way that they can't see the difference. Some techniques can even survive destructive operations like cropping, brightness, rotation, noise, overlays, etc.
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10-04-2014, 01:32 PM
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#9 | |
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Registered User
Industry Role:
Join Date: Oct 2014
Posts: 5
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