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Watermark Detection

How can I detect if an image has an embedded watermark?

         

is300

1:13 am on May 20, 2004 (gmt 0)

10+ Year Member



How can I detect if an image has an embedded watermark?

Are there any programs out there that can detect them? I know of photoshop's digimarc, but does this detect other third party watermarks? I'm looking for something that can detect all types of digital watermarks.

Receptional

2:36 pm on May 20, 2004 (gmt 0)



I may be not understanding "watermark" here, but I am pretty sure that this would be impossible on all counts. Most "watermarks" are imprints on the image aren't they? this makes them an integral part of the image, so can't be didgitally "decompiled" as such. I am sure there are many things that have fancy watermark stuff that could be removed, but the vast majority of images will just have an identifoable feature or trademark in the picture.

is300

4:28 pm on May 20, 2004 (gmt 0)

10+ Year Member



well, it's my understanding they now have a way of doing invisible watermarks, so if you take an image off a website and use it on yours, the owner can read the file and determine it is there's. I think digimarc does this.

Sanenet

4:33 pm on May 20, 2004 (gmt 0)

WebmasterWorld Senior Member 10+ Year Member



Correct - there are several systems out there that allow the copyright owner to "insert" an invisible watermark into an image. Even if you change the image, the watermark still shows up when put through the "decrypter".

As for detecting them - well, you need to run it against the different software. Never heard of any automated tool that does it for you.

john_k

4:34 pm on May 20, 2004 (gmt 0)

WebmasterWorld Senior Member 10+ Year Member



I suppose you could do something with the alpha layer, but I'm not sure how.

Maybe it would help to know more about what you are doing. The two possibilities that come to mind are:
1) You want to verify that files uploaded by users don't have watermarks (or that they do have them?), or
2) You want to add watermarks so that you can detect whether or not copying has taken place.

is300

9:35 pm on May 20, 2004 (gmt 0)

10+ Year Member



i have a short term website that i need to promote and need to borrow a few images. yes i know what i'm doing is wrong.

the site will only be live for a few weeks and there isn't enough time to find the images. thus i need to borrow them without worries.

albert

10:00 pm on May 20, 2004 (gmt 0)

10+ Year Member



yes i know what i'm doing is wrong.

thus i need to borrow them without worries.

Well, what's next?

willybfriendly

10:08 pm on May 20, 2004 (gmt 0)

WebmasterWorld Senior Member 10+ Year Member



thus i need to borrow them

I always taught my kids that using something that doesn't belong to you without permission is stealing.

In other words, they couldn't borrow my tools unless they asked first. Anything less was theft in our house.

Why not ask if you can use the images. My experience with asking has generally been positive.

WBF

Liane

10:13 pm on May 20, 2004 (gmt 0)

WebmasterWorld Senior Member 10+ Year Member



the site will only be live for a few weeks

LOL! Yeah ... every smart spammer knows their site will be gone in a month which gives them just enough time to build 5 more just like it! So while they "steal" someone elses traffic, why not steal their images as well!

Unbelieveable!

EileenC

11:02 pm on May 20, 2004 (gmt 0)

10+ Year Member



That's not borrowing. That's stealing. I think you've come to the wrong place if you expect the folks here to help you commit intellectual property theft.

diddlydazz

11:16 pm on May 20, 2004 (gmt 0)

WebmasterWorld Senior Member 10+ Year Member Top Contributors Of The Month



is300, i think you are in the wrong place for that sort of advice.

In my opinion stealing someone elses work and passing it off as your own is one of the lowest forms of theft, your time might be better spent creating your own images.

Dazz

bunltd

11:57 pm on May 20, 2004 (gmt 0)

10+ Year Member



I agree with Dazz, it seems that in the time you spent researching the watermark issue, you probably could have created the images on your own, or found suitable images from a royalty free source... Stealing isn't the way to go, no matter how short term your need, it's still stealing.

LisaB

Shannon Moore

5:57 am on May 21, 2004 (gmt 0)

10+ Year Member



Ethics... Responsibility... Respect...

Something more than images are missing from the thread author's business.

"I just need to... borrow... your affiliate links/revenue. How's that sound?"

"I just need to... take this content... so I can get my own site off the ground."

Thanks for the reminder of how the bottom of the barrel thinks.

victor

8:42 am on May 21, 2004 (gmt 0)

WebmasterWorld Senior Member 10+ Year Member



How can I detect if an image has an embedded watermark?

  • Use it on your website.
  • When you receive a bill for damages and costs for using it without permission, pay up and remove the image.
  • Add that image to a list known to be protected by some mechanism or other.
  • Repeat until bank balance < 0, or legal actions force you out of business.
  • Leosghost

    11:05 am on May 21, 2004 (gmt 0)

    WebmasterWorld Senior Member 10+ Year Member Top Contributors Of The Month



    Claim "fair use" and give "bigdave" as the reference .

    kevinpate

    12:42 pm on May 21, 2004 (gmt 0)

    WebmasterWorld Senior Member 10+ Year Member



    Hmmmmm, I need to make a road trip. I only want to be gone for a few weeks, and then I'll need to be back home.

    Trouble is, I don't want to wait on my mechanic to tune up the car for me.

    Anyone here know how I can find out where is300 hides the car keys? Yeah, I know it's wrong, but I only expect to use is300's car for a couple of weeks ...that makes it ok right?

    unbelievable indeed

    MatthewHSE

    4:00 pm on May 27, 2004 (gmt 0)

    WebmasterWorld Senior Member 10+ Year Member



    Another "bad idea" post here may be superfluous, but I'd also like to mention that the code of honor here is typically pretty high. Wrong place to ask about how to deliberately take someone's stuff.

    Sanenet

    4:04 pm on May 27, 2004 (gmt 0)

    WebmasterWorld Senior Member 10+ Year Member



    Is it just me or is IS300 somewhat unpopular? :s

    Leosghost

    5:32 pm on May 27, 2004 (gmt 0)

    WebmasterWorld Senior Member 10+ Year Member Top Contributors Of The Month



    So the "mods" can wrap this up and let the bandwidth here be used for some more worthy cause I'll answer you question exactly and hopefully definitively ...

    Yes watermarks can be detected ...in most grafic apps such as Photoshop, PSP etc you hit detect watermark and if the image includes an embedded watermark from one of the big services such as Digimarc then it will say so ...you will also have the chance to go to the records and contact the artist ( such as myself ..I do use Digimarc for the images likely to attract theives ) to ask if you can use their images ...

    If they refuse it's stealing and you hopefully will face a lawsuit with all that entails : )

    I include other also "embeds " of my own ....and if you can strip these out and use the images then you would be someone that some of us here probably already know from our previous lives as cr@kerz or h@ckerz and would not be asking such a dumb question ...

    just because everyone wears a whitish hat here doesn't mean ....

    So not only can you be found when you steal and prosecuted ..but you might even get your server "smooched" for you depending on whom you steal from .....

    Even with tricky scripts to protect images like I use in some places ..as ronin pointed out when he showed me he could still "steal" one of my images the other day 'cos I was too lazy to "lock the backdoor" ...he still left a trace in my logs ....

    So if he wasn't a friend I could have eventually found what he did with it and where he might have used it ..

    Stealing images is unethical..
    .can get you in court very quick ...
    and you never do know the tech level of who you are messing with ....some of the tackiest sites are run by some of the best hackers on the planet ....or their close family ....

    There are people on these WebmasterWorld boards who know more about programming than I ever will ..and than you could ever imagine ....

    thats my pontificate on the subject ...

    want to give me the last word mods .....?

    BigDave

    7:43 pm on May 27, 2004 (gmt 0)

    WebmasterWorld Senior Member 10+ Year Member



    Claim "fair use" and give "bigdave" as the reference .

    You never did bother to try and comprehend my point, did you?

    Fair Use is a right, it is not taking anything from the creator of the work.

    But Copyright grants rights to the creator, and violating those rights is wrong, unethical and illegal. Fair Use is *not* a violation of those rights (by definition) and is in no way unethical. Denying someone their Fair Use rights is as unethical as violating Copyright.

    What he is suggesting is in no way Fair Use, therefore I do not support it.

    If they refuse it's stealing and you hopefully will face a lawsuit with all that entails : )

    Technically it is not stealing, it is infringement. Civil, not criminal.

    Stealing implies theft, and that is simply not the case. But you are correct that this would be an obvious case of infringement that could, and should, result in a lawsuit and a finding for the plaintiff.

    As for invisible watermarks, they really don't seem to be of much value to me. Can someone explain to me what additional value they give you in court?

    The only thing I can think of is if someone radically tweaks your image so that it no longer resembles the original in any recognizeable way, and you would still be able to show that it is a derivative work.

    But what this clown is talking about is just straight up using an image as-is. There is no need for a watermark to be able to prove it is a copy. I don't even see why he is worrying about them. It is infringing whether or not there is a watermark.