The horses helped them travel and hunt quickly.
A photo's color intensity can be modified by changing the brightness and contrast. This type of situations are best known by professional cameramen. The photographer can adjust the brightness and contrast based on the type of picture that the photographer wants to take. The color intensity changes with these factors.
Chris's attitude change is best explained by cognitive dissonance.
It refers to the fact that a person may be experiencing thoughts and feelings which are not really consistent, and which may change, sometimes drastically. In Chris's case, he hated pop music, until he actually listened to one pop song and liked it, and then changed his opinion.
