Invisible digital watermark

[Simon Frei]

There is a G'MIC filter that embeds text in the fourier domain, it is
called "Fourier watermark" (and "Fourier analysis" to retrieve the
info): https://gmicol.greyc.fr/

On 12/05/17 11:35, Gilles Caulier wrote:
> You cannot. Invisble watermark use wavelets encoding methods which are
> patented in US and impossible as i know to code in open source...
>
> Best
>
> Gilles Caulier
>
> 2017-05-12 10:42 GMT+02:00 Louis A. Turk <louisaturk at firmanelohim.org>:
>> How can I do invisible digital watermarking with digikam5 as mentioned
>> here:
>> https://docs.kde.org/trunk5/en/extragear-graphics/digikam/using-dam.html#using-dam-copyright
>>
>> How can I do a regular watermark?
>>
>> drl