Exercise 2 solution

(a) Living room under an ordinary lamp: the incandescent preset (about 3,000 K on the example camera).
(b) Sunny afternoon: direct sunlight (about 5,200 K).
(c) Shaded path on a bright day: shade (about 8,000 K).
Adjusting: the setting tells the camera what colour temperature the light is, and the camera compensates. If the picture looks too blue, the camera has assumed the light was warmer than it really was; raise the kelvin number toward cooler light so the camera adds less blue. If it looks too orange, lower the number. (I am describing the usual behaviour from my own knowledge, not from the article; check on your camera.)