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In the post-production process of film and video editing, a dissolve (sometimes called a lap dissolve) is a type of film transition in which one sequence fades over another. The terms fade-out (also called fade to black) and fade-in are used to describe a transition to and from a blank image. This is in contrast to a cut, where there is no such transition. A dissolve overlaps two shots for the duration of the effect, usually at the end of one scene and the beginning of the next, but may also be used in montage sequences. Generally, but not always, the use of a dissolve is held to indicate that a time has passed between the two scenes. Also, it may indicate a change of location or the start of a flashback.