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40.

If true, the image is composited with what's behind it. If false, the default, the image is opaque and overwrites what's behind it.

41.

`reverse`

42.

If true, the alpha channel is reversed. Opaque areas are taken from the old image, while transparent areas are taken from the new image.

43.

Returns a transition that composes up to three transitions. If not None, the `before` and `after` transitions are applied to the old and new scenes, respectively. These updated old and new scenes are then supplied to the `trans` transition.

44.

Returns a transition that works by cropping a scene and positioning it on the screen. This can be used to implement a variety of effects, all of which involved changing rectangular slices of scenes.

45.

`time`

46.

The time the transition takes.

47.

`mode`

48.

The name of the mode of the transition. There are three groups of modes: wipes, slides, and other. This can also be "custom", to allow a custom mode to be defined.

49.

In a wipe, the image stays fixed, and more of it is revealed as the transition progresses. For example, in "wiperight", a wipe from left to right, first the left edge of the image is revealed at the left edge of the screen, then the center of the image, and finally the right side of the image at the right of the screen. Other supported wipes are "wipeleft", "wipedown", and "wipeup".