For proof of relationship pictures (wedding etc.), I was wondering if printing them just like other pages (black and white) is fine? Or should it be color printing?
no, printing pictures in black and white will not lead to a rejection.
it does not matter whether the pictures are black/white or color. what matters is that the visa offier can clearly distinquish who are in the pictures and whether they represent a relationship that is true and known to other people.
