'Monochrome' is an overarching term used to describe images comprised of only two colours e.g. black and white, or brown and white (sepia), and usually all their combinations (eg grey in black and white, and light browns in sepia).
'Monochrome' is an overarching term used to describe images comprised of only two colours e.g. black and white, or brown and white (sepia), and usually all their combinations (eg grey in black and white, and light browns in sepia). What's important to realise is that monochrome doesn't necessarily mean black and white.