4. Colour

The colour used in this particular title sequence is overexposed in a way that suggests the antiquity of the home videos. All of the clips appear to have been shot on sunny days, to keep the mood happy. In the background of the two clips that play simultaneously, it is plain black so that the focus is on the characters. The introductory credits are in a simple white font upon the black background. There is a certain theme of simplicity.

There is a general bluish tone over the clips of young Zooey Deschanel, as compared to a warm tone over the shots of young James Gordon-Levitt. For example, there is a scene where teenage Gordon-Levitt is playing guitar in his bedroom, and parallel to that is a scene of Deschanel indoors where she is making a paper crane. I think this is done as a premonition of their attitudes in the movie. Summer is more of a cold character, who doesn't allow too much emotion into her life, whereas Tom is searching for love and falls head-over-heels in love with Summer at first sight.
The colour looks desaturated and overexposed because the quality and resolution are not the best, but I think this adds to the intentional vintage effect. The use of colour in this title sequence contributes to the mood by keeping it simple and positive. There are no overly bright or dull colours that will distract the eye from one clip to another, the tone is either neutral and slightly warm/orange or neutral and slightly cold/blue, in order to keep the viewer intersted in both simultaneous clips.