Using these photos
Many of these photos are under a Creative Commons license: you can use them, in print and online, for free, as long as you do what the license asks. Each photo's page says which license it has, and gives the credit line to copy.
CC BY-SA 4.0. You may share and adapt it, also commercially, crediting the author and sharing what you make under the same license.
CC BY 4.0. You may share and adapt it, also commercially, crediting the author.
CC BY-NC 4.0. You may share and adapt it for non-commercial purposes, crediting the author.
CC0 1.0. Public domain: use it as you like, no credit required.
A credit names the photo, the author, where it comes from and the license, for example:
“Registan at dusk” by Giorgio Montersino, CC BY-SA 4.0, https://photo.giorgiomontersino.com/photo/…
The files you download carry the same information inside, as metadata.
For a photo marked “all rights reserved”, a larger file, or a use the license doesn't cover, get in touch through giorgiomontersino.com.