‘Okay Craig, really? The others come up with exciting words and phrases that begin with the letter for this week and you go for a colour? What does that have to do with writing?’
The main difference between written fiction and visual fiction is obvious: the former requires imagination. The human imagination is an amazing thing that works both ways in fiction: both from the author who creates the work, and the reader, the latter being the most vivid. People interpret written work in different ways, and no two people will read the same story the same way.
So why yellow?
Yellow, when used in visual media, often represents positive emotions or key points in a scene (see “Jaws“). By adding the colour yellow to a scene in a novel, people will (often) keep the image in their mind and it’ll help put the scene’s ideas forward.