this post was submitted on 27 Jul 2023
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Comradeship // Freechat

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Pictures, meta data, privacy (lemmygrad.ml)
submitted 1 year ago* (last edited 1 year ago) by [email protected] to c/[email protected]
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You may have noticed that I don't post pictures. If not, now you know.

One of the reasons is that I'm worried about sharing meta data.

Does anyone know:

  1. Does the Lemmy software strip / hide meta data from photos when they're uploaded?
  2. Is there a way of stripping meta data from photos?
  3. Does downloading an image from the internet and uploading it from my hard drive add any meta data?
  4. If I create a digital image, does it have meta data that could reveal my location, etc? (And then questions 1 and 2 for this option.)
  5. How should/could I keep my data/location safe if I choose to post either my photos, my scans, or pictures (either created by me or downloaded from the internet)?
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[โ€“] [email protected] 4 points 1 year ago (1 children)

There is of course a way to strip metadata from pictures.This is what I use on Android. It is also the way how I upload pictures of my pigeons on this lemmy instance.

On Linux there is exiftool. This perl program is also capable to manipulate metadata from audio and video files.

Exiftool is also usable on Windows and Mac. This tool is very powerfull:

ExifTool supports many different metadata formats including EXIF, GPS, IPTC, XMP, JFIF, GeoTIFF, ICC Profile, Photoshop IRB, FlashPix, AFCP and ID3, Lyrics3, as well as the maker notes of many digital cameras by Canon, Casio, DJI, FLIR, FujiFilm, GE, GoPro, HP, JVC/Victor, Kodak, Leaf, Minolta/Konica-Minolta, Motorola, Nikon, Nintendo, Olympus/Epson, Panasonic/Leica, Pentax/Asahi, Phase One, Reconyx, Ricoh, Samsung, Sanyo, Sigma/Foveon and Sony.

To your third question: No. The metadata is included in the file itself. You need to do something with it, like importing and GIMP and exporting - GIMP may add an tag, that it was creates with GIMP. Of course there are formats, which have a separeted metadata file, but I am not talking about this. And dont forget the creation time thing and so on, but it is not hard to change some of it

To your fourth question: if you take photos, there may be information. It is possible to enable geotagging etc. The best option is to try it yourself. Take pictures with your Smartphone, make pictures with your computer or with something else and then read the metadata. Use exiftool for this task, but other programs are also ok. My smartphone only saves the brand and the model of my smartphone.

To your fifth question: delete metadata and take care, that there is nothing what can be traced to yourself (Names, Streets etc). Metadata is also available for PDF Files and many many more formats.

[โ€“] [email protected] 3 points 1 year ago

Thanks for all this advice!

That's reassuring about downloaded images.