Digital photo fingerprinting

[Dan Purgert]

This is an academic question as I'm not hiding from any TLA (at the moment).
It's just interesting.

It's simple basic knowledge that everyone who uploads should probably know.

It's about digital photo fingerprinting.
You know, auto-connecting two photos by unique camera sensor imperfections.

Using just irfanview.
On Windows.

What common simple easy things can one habitually do on Windows to their
digital photos published online that will help make robotic digital
fingerprinting harder based on inevitable unique sensor imperfections?

And in what order?

A simple example is to save the RAW/JPEG from your camera as GIF and maybe
then resize, sharpen, auto adjust colors, and maybe even flip & rotate in
irfanview ever so slightly and then maybe crop out the original edges and
perhaps even screen shot & maybe so that the sensor imperfections become
more that of your screen and not that of your camera sensor.

Maybe one or two of those actions are the most useful to wipe out camera
sensor imperfections, but which one or two irfanview actions might that be?

If a dedicated app exists for this that would be nice (otherwise irfanview).

It's an academic question.
About digital photo fingerprinting.

What (simple) operations?
What (scripted) order?
--
|_|O|_|
|_|_|O| Github: https://github.com/dpurgert
|O|O|O| PGP: 05CA 9A50 3F2E 1335 4DC5 4AEE 8E11 DDF3 1279 A281

[Savageduck]

On Jun 18, 2021, Dan Purgert wrote
(in article <1j7eyoryxwpr3$.d...@djph.net>):

What are you trying to achieve?

Are you trying to obfuscate EXIF data to hide personal, camera, exposure, and/or GPS data?
All of that is easily done with an EXIF editor.

Perhaps you are looking to somehow protect your ownership/copyright of an image?
There are several proprietary software methods of fingerprinting/watermarking images one of these is Digimarc.
<https://www.digimarc.com/about/technology/about-digital-watermarking/>

...and then there was this recent article.
<https://petapixel.com/2021/06/16/new-markpainting-tech-blocks-watermark-removal-fights-deepfakes/>

...or are you just trying to poach/steal images, and hide the origins?

--
Regards,
Savageduck

[nospam]

In article <1j7eyoryxwpr3$.d...@djph.net>, Dan Purgert <d...@djph.net>
wrote:

hi arlen

[Savageduck]

On Jun 18, 2021, nospam wrote
(in article<180620211200267262%nos...@nospam.invalid>):

> In article<1j7eyoryxwpr3$.d...@djph.net>, Dan Purgert<d...@djph.net>
> wrote:
>

> > This is an academic question ....
>
> hi arlen

A new persona to the group with an oddball question, so quite possible.

--
Regards,
Savageduck

[nospam]

In article <0001HW.267CFEAB00...@news.giganews.com>,

Savageduck <savageduck1@{REMOVESPAM}me.com> wrote:


> > In article<1j7eyoryxwpr3$.d...@djph.net>, Dan Purgert<d...@djph.net>

> > > This is an academic question ....
> >
> > hi arlen
>
> A new persona to the group with an oddball question, so quite possible.

not oddball for 'arlen'. it's exactly something he would ask.

my arf (arlen response factor) indicator is reading very high.

it's also rather amusing, because some cameras write the serial number
of the camera in the exif data.

other cameras, if so equipped, will forensically sign the photo to show
whether or not a photo has been modified after it was taken.

[Savageduck]

On Jun 18, 2021, nospam wrote

(in article<180620211234511181%nos...@nospam.invalid>):

> In article<0001HW.267CFEAB00...@news.giganews.com>,
> Savageduck <savageduck1@{REMOVESPAM}me.com> wrote:
>
> > > In article<1j7eyoryxwpr3$.d...@djph.net>, Dan Purgert<d...@djph.net>
> > > > This is an academic question ....
> > >
> > > hi arlen
> >
> > A new persona to the group with an oddball question, so quite possible.
>
> not oddball for 'arlen'. it's exactly something he would ask.
>
> my arf (arlen response factor) indicator is reading very high.
>
> it's also rather amusing, because some cameras write the serial number
> of the camera in the exif data.

Mine does, both camera, and lens serial numbers.

>
> other cameras, if so equipped, will forensically sign the photo to show
> whether or not a photo has been modified after it was taken.

This sounded to me that this was somebody asking for a “How to steal images guide” which sounded a lot like “Sobriquet” who does steal images.
...but Arlen is a very strong candidate, and he has been a “Dan” in the past.

--
Regards,
Savageduck

[nospam]

In article <0001HW.267D0D3900...@news.giganews.com>,

Savageduck <savageduck1@{REMOVESPAM}me.com> wrote:

> > it's also rather amusing, because some cameras write the serial number
> > of the camera in the exif data.
>
> Mine does, both camera, and lens serial numbers.

has the black van arrived? the one with the three antennas on the roof?

> > other cameras, if so equipped, will forensically sign the photo to show
> > whether or not a photo has been modified after it was taken.
>
> This sounded to me that this was somebody asking for a ³How to steal images
> guide² which sounded a lot like ³Sobriquet² who does steal images.

that would implicate the person who uploaded them, not the person who
stole them.

to me it sounded like 'if i upload my photos, can someone track me
down' which plays right into arlen's tin-foil hat paranoia.

> ...but Arlen is a very strong candidate, and he has been a ³Dan² in the past.

i've lost track of them all.

right now there are several concurrent ones.

[Bill W]

On Jun 18, 2021, Savageduck wrote
(in article<0001HW.267D0D3900...@news.giganews.com>):

Yes, it’s almost like his posts have... uh... fingerprints. Another one is
the extended ramblings on technical details. He did the same thing in an auto
repair group.

[Alan Browne]

On 2021-06-18 12:00, nospam wrote:

>
> hi arlen

Funny how his own digital fingerprint was all over his own post....

[Alan Browne]

On 2021-06-18 13:56, Bill W wrote:

>
> Yes, it’s almost like his posts have... uh... fingerprints.

Damn. Beat me to it.

--
"...there are many humorous things in this world; among them the white
man's notion that he is less savage than the other savages."
-Samuel Clemens

[Carlos E.R.]

There was a proper "Dan Purgert <d...@djph.net>" on the android group
going back to 2018 who used a distinct signature footer:

|_|O|_| Registered Linux user #585947

|_|_|O| Github: https://github.com/dpurgert
|O|O|O| PGP: 05CA 9A50 3F2E 1335 4DC5 4AEE 8E11 DDF3 1279 A281

and he used "slrn/1.0.3 (Linux)" to post (same as this post here).

At that time, Arlen used "Arlen H. Holder <arlen...@nospam.net>" in
the same thread. They were different people.

You can verify the github url, too.

Sorry, but this is not Arlen. Of course, he could post using a proper
PGP signature with that old signcode for proper verification.

--
Cheers, Carlos.

[Dan Purgert]

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Hash: SHA256

Savageduck wrote:
> Are you trying to obfuscate EXIF data

If I have to explain EXIF data isn't in a GIF you can't help me.
You can't even help yourself as you don't belong on this group.
It's doubtful you have the skills necessary to understand the topic.

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[Carlos E.R.]

On 19/06/2021 19.27, Dan Purgert wrote:
> Savageduck wrote:
>> Are you trying to obfuscate EXIF data
>
> If I have to explain EXIF data isn't in a GIF you can't help me.
> You can't even help yourself as you don't belong on this group.
> It's doubtful you have the skills necessary to understand the topic.

Sorry, but this is uncalled for.

You do not get to tell who is entitled to post here, the group name
doesn't say "professionals only". Any Joe that makes digital photos can
write here (unfortunately many here do not understand this).

Besides, you did not say that GIF was a requirement to your question.
Please go back to your question and grep for the "GIF" word and in what
context it is: it is inside an example.


Sorry, but the same as I had to defend you from others accusing you of
being Arlen, I have to defend Savageduck that did not understood you
were talking of GIFs. Neither did I.

I understand you may be pissed by the false accusation, though.



--
Cheers, Carlos.

[nospam]

In article <eby2jotb...@djph.net>, Dan Purgert <d...@djph.net>

wrote:

> > Are you trying to obfuscate EXIF data
>
> If I have to explain EXIF data isn't in a GIF you can't help me.

nobody can help with your paranoia.

> You can't even help yourself as you don't belong on this group.

he's been here a lot longer than you have.

> It's doubtful you have the skills necessary to understand the topic.

he does.

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get rid of that garbage.

[Savageduck]

On Jun 19, 2021, Dan Purgert wrote
(in article <eby2jotb...@djph.net>):

> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA256
>
> Savageduck wrote:
> > Are you trying to obfuscate EXIF data
>
> If I have to explain EXIF data isn't in a GIF you can't help me.

I seriously doubt that any of the regulars to this NG would consider going from RAW/JPEG to GIF in any part of their workflow. I certainly would not. Your entire question is somewhat off the wall, and I thought I was giving you the hint that you needed to explain your intended purpose clearer. In this you failed.

>
> You can't even help yourself as you don't belong on this group.
> It's doubtful you have the skills necessary to understand the topic.

For somebody on their first visit to r.d.p. to judge whether, or not I, or anybody else belongs here is an indication of your ignorance regarding the background, and experience of the regular participants. Some of us have been here for many years, and come from a variety of professions. Consider that you are the stranger to this NG, with an odd/questionable question before you pass an opinion regarding me belonging here.

As for my skills, you have no idea of my history, skills, knowledge, and understanding regarding the topic, but it is clear that I know more than you.

--
Regards,
Savageduck

[Paul Carmichael]

El Sat, 19 Jun 2021 12:05:22 -0700, Savageduck escribió:

> On Jun 19, 2021, Dan Purgert wrote (in article
> <eby2jotb...@djph.net>):

>> You can't even help yourself as you don't belong on this group.

> Some of us have been here for many years, and come from a variety of
> professions. Consider that you are the stranger to this NG, with an
> odd/questionable question before you pass an opinion regarding me
> belonging here.

You don't belong in this grammar group! It should be "MY belonging here".

Oh, as you were...


--
Paul.

https://paulc.es/elpatio