There are other ways to add "invisible" watermarks - such techniques can
also be used for steganography - a technique for hiding messages (or other
images) in a picture - very useful for spies and others! However - some of
the techniques rely on you having access to the image file that was used in
the publication, which is unlikely without a court order I guess!
On 23 July 2012 15:56, Tony Keene <> wrote:
> Another trick is adding very subtle tags. Have a look at the first image
> (ignoring the obvious tag at the bottom):
> http://www.tonykeenebirds.co.**uk/abirds/mangroverobin.html<http://www.tonykeenebirds.co.uk/abirds/mangroverobin.html>
> You can see it if you up the contrast and drop the brightness...
> Cheers,
>
> Tony
>
>
> On 23/07/2012 15:13, Carl Clifford wrote:
>
>> Dear B-A,
>>
>> I have been following the "what value a photo" with interest. One thing
>> that has not been mentioned, is that if your name is not on or in an image,
>> it is difficult to identify the work as being yours.
>>
>> It is important that you identify your digital images by naming yourself
>> as photographer and copyright holder in the EXIF data of your images. Sure
>> EXIF data can be stripped, but most people who "borrow" images usually
>> overlook it and it remains as a nice digital thumb-print on your images.
>>
>> For those who have not set up their EXIF, and would like to know how, it
>> is in the manual.
>>
>> Cheers,
>>
>> Sent from my iPadh
>> ==============================**=
>>
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