What is Nostr?
Darryl 🇳🇿 /
npub1l4g…wkuw
2023-10-20 19:50:19
in reply to nevent1q…6l8t

Darryl 🇳🇿 on Nostr: npub16rsfu…c2zfj When I look at that card, I can see a hole in the middle. So I ...

npub16rsfuhv9vvn39cmrdg9s9qcq20lfqp4u8w35f8svm30dny345d7qhc2zfj (npub16rs…2zfj)
When I look at that card, I can see a hole in the middle.

So I would imagine, speculation, you can place it on top of an item painted a single matte colour and take a photo of it.

The four digital gliphs in the corners will allow a program to centre and work out what colour the surface in the centre hole is by comparing to the surrounding patch work of sample colours.

Items like that card will fade a tiny amount in time so, it will go uncalibrated after a couple of years.
Author Public Key
npub1l4gqylqulvdd295edk2fvzqr0hplvkdc5fydk3r2d9swc99egmgqqtwkuw