pathsjs

I have resisted for many years to use cloud services to host my pictures, but the friction to use multiple devices and share photos with my wife is only growing, so I am looking for a good alternative. I have about 70GB of pictures from all my life, which I am currently keeping both on a Mac laptop and on an SD card on my Android phone.

Ideally, my workflow would be:

- take pictures from either my personal of work phone

- have them magically backuped on my laptop

- possibly, have them synced on my personal phone as well

- the work phone can just be a source, if I need to access photos there, I can use a client to look them online

My needs are:

- basic tagging functionality, possibly automated (dates, places, maybe people) with some sort of search

- possiblity to share albums with other people

- important: pictures should never live in the cloud only, so some sort of sync at least on the laptop, possibly on Android phones as well

- clients for Mac, Android, if possible Linux

- the service should have at least some chance of lasting forever - moving all your pictures is a hassle, I would like to have at least some chance to be able to use it 30 years from now

I have considered Nextcloud: I already have some hosting on Hetzner, but I couldn't find photo management apps that are usable both in the browser and on phones. Otherwise, there is Google Photos, Amazon Photos... Anything else?

I am looking for a book on color science which covers all the usual topics - the basics of perception, physics of color, color spaces, luminance, white balance, color histograms and so on - but that is targeted to programmers.

By this, I mean that I would like to understand how one would implement various algorithms (say, color space transforms) and also cover a bit of the more technological aspects, for instance what are ICC profiles and how to use them.

What could be a good suggestion?