One image fades out as another fades in. For a moment, both are visible. That is a dissolve, a gradual transition between two shots. It is softer than a cut, which is abrupt. The dissolve suggests a passage of time, a change of location, or a connection between two scenes. It is one of the oldest transitions in film, and it remains in use today.

The dissolve has many uses. It can compress time, showing a character aging or a season changing. It can link two related scenes, suggesting a thematic connection. It can soften a jump in location. It can create a dreamy, lyrical effect. It can signal a flashback or a fantasy. The effect depends on the context and the duration of the dissolve. A slow dissolve feels languid. A fast dissolve feels urgent.

The dissolve was more common in classical Hollywood than it is today. Modern films tend to favor cuts, which are faster and less obtrusive. But the dissolve remains a useful tool. It is used in montages, in transitions between acts, and in moments of emotional transition. When used well, it is invisible. When used poorly, it is clunky. The editor's judgment determines which.