I noticed a few days ago that someone had put up two signs on a local, fairly busy, road. They were cloth signs with the following painted on them, "Covid vax heart attacks", and on the other "Covid shots blood clots". Pretty effective; short and sweet. I would have taken photos, but if I want to download photos to my computer, for posting here, I have to take them with my digital camera, download to a laptop computer in our house, for transfer to my laptop that I use for posting things here. (my laptop sd card reader quit working a couple years ago) It looked like a county highway department truck was in the process of taking them down, but a few thousand people probably saw them while they were up.
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https://www.snopes.com/fact-check/household-printers-tracking-code/
Similar technology has existed for years in the physical space.
20 years ago there was a plug in for Photoshop that could encode/decode an image. I used it a few times. Sadly certain things are not so easy to find on the search engines these days.
You would be at a disadvantage to assume this is not the case for image processing in video cards of consumer machines.
Just use a denoiser in photoshop to zap your images just in case. It's just prudent.