Photographs of 19th Century Japan

In case anyone is wondering whether these are real colour photographs, the answer is no: https://en.wikipedia.org/wiki/Hand-colouring#Japanese_hand-c...

And it's also mentioned in the third paragraph:

> They were originally shot in black and white, then hand-coloured by artists — a technique common at the time.

I can't tell from that, was the photographer generally the painter? Or was the painter at least present when the photograph was taken?

Based on the accurate coloration of the Yomei-mon gate at Nikko, the painter must have been familiar enough with the photo subjects.