What does Opacity control in a video clip?

Opacity in a video clip specifically controls the level of transparency of that clip. When you adjust the opacity, you dictate how see-through the video is, which affects how it interacts with layers that may be beneath it. A higher opacity percentage means the clip is more solid and opaque, while a lower percentage results in a more transparent appearance, allowing elements from other layers to be visible through it. This functionality is essential in various applications, especially when creating overlays, transitions, or compositing different video elements together.

In contrast, the other options focus on different attributes of the video. Brightness refers to the lightness or darkness of the image rather than its transparency. Color grading deals with adjusting the colors and tones within the clip, affecting its visual style but not transparency. Audio levels pertain to the sound aspects of the clip, which is entirely separate from video transparency. Thus, the correct understanding of opacity is crucial for achieving the desired visual effects in video editing.