Produces an effect in which the colours of an image 'flow' out of their pixels in a fluid manner. The colours flow along vectors found at each pixel from the gradients of a control image. The colours mix together as they go. The effect is useful for novel transitions, as well as for creating animating texture maps for use in other software (e.g. planetary atmosphere textures). The effect is applied to the current frame of the input clip. This is flowed under the influence of a control image (which can animate, if desired) to produce a sequence of output frames.
Select Thin to see what is happening.Density (List Box Options: Thin | Stretch, Default: Stretch)
Black: as the pixels flow, black is revealed not the background image.
Reveal: colour flows off revealing the background image.
Thin: when colour flows out of a pixel, the pixel is left partially (or wholly) empty. The pixel gets less dense, so (if options are selected appropriately) you can see the background through it.Look (List Box Options: Opaque | Luminous, Default: Opaque)
Stretch: when colour flows out of a pixel, the material in the pixel stretches without the pixel emptying.
Opaque: the 'stuff' that colours the pixel and flows out of it can be thought of as reflecting light to give colour.Edge (List Box Options: Wrap | Black, Default: Wrap)
Luminous: the 'stuff' that colours the pixel and flows out of it can be thought of as emitting light. As colour flows into a pixel, it will get brighter.
Wrap: if colour flows off the edge of the image, it flows in again at the opposite edge (think of the image as being wrapped so that the left and right edges are taped together, and similarly, the top and bottom edges).Flow Mode (List Box Options: Flow Once | Flow Each, Default: Flow Once)
Black: colour flows off into oblivion and black flows in to fill partially empty edge pixels.
Flow Once: the flow field is calculated once, from the current image in the Control clip and applied to the current image in the Foreground clip (when Restart Pixflow is pressed).Img Smooth (Number Min: 1, Max: 50, Default: 5)
Flow Each: the flow field is computed for each frame of the Control clip and used to flow the Foreground image.
Gradients: the direction of movement is from dark to light areas in the control image.Normalize (List Box Options: Mag+Dir | Dir Only, Default: Dir Only)
Tangents: the direction of movement is at right angles to the gradients. Tangents tend to give swirly flow, while gradients give straighter paths.
The control image gradients are used to form a field of vectors, which controls the flow of the fluid.Flow Dir (List Box Options: Forward | Reverse, Default: Forward)
Dir Only: all vectors are the same length, and only the field direction changes. For many control images, Dir Only gives nicer results. Fluid otherwise tends to settle quickly in 'flat' regions of the control image.
Mag + Dir.: the length of the vectors is found from the strength of the gradient and is used to control how quickly the fluid flows, as well as the direction it flows in.
Reverses the directions of the flow field vectors after they have been found.Turbulence (Checkbox Default: Off)