When you use an effect in iMovie, you choose a clip, such as the one in Figure 15.19, and decide you want to do something to it. In this case, we have a video clip in which we can see that the picture came out a bit dark.
Figure 15.19. A dark clip before the Brightness/Contrast effect is applied.
But with a bit of tweaking, using the Brightness/Contrast controls, we can improve the clip so that you can see the subject a bit better (see Figure 15.20).
Figure 15.20. The clip after the Brightness/Contrast effect is applied.