Blur

Blur

The Blur Effect creates many copies of an object, with each copy having either a progressively increasing or decreasing alpha value. By changing the position, scale or alpha value of each copy over time, it can create a motion-blur Effect.

Below is an illustration of the Blur tab in the 'Blur Settings' dialog box. This is displayed when you first create the Blur Effect. It can also be displayed by double-clicking on a Blur Effect in the Timeline, or right-clicking on a Blur Effect and choosing 'Properties' from the context Menu.

Blur Mode
Determines the style of the Blur Effect. The styles available are:

·	Zoom Blur: duplicates of the object are displayed at progressively larger scales, with smaller alphas. When the object is blurred in, the duplicates are faded in and squeezed into the size of the original object. When the object is blurred out, the duplicates are faded out and stretched outward

Mirror Blur: when the object is blurred, two sets of duplicates are moved away from its reference position in opposite directions. When the object is brought into focus, two sets of duplicates are moved towards the reference position from opposite directions. The further away the duplicates are, the smaller the alpha value

Slide Blur: duplicates of the object move from the off-screen position defined by the 'Direction' option (and the Effect Transform) to the object's reference position. Selection of either the 'Invisible' or 'Visible' radio button determines whether the Effect travels to or from the object's reference position on-screen to the off-screen point. Each duplicate is displayed with progressively smaller alphas. As the object approaches its reference position, the duplicates catch-up with the object so they all finish at the same place.

Blur Amount
Determines how many copies of the object are duplicated to carry out the Blur Effect.

Direction
Controls the direction of squeeze/stretch, moving in/away or slide in/out.

Blur Scale Factor
Specifies the maximum scaling change or offset between two duplicates.

Begin with
Controls the initial state of an object and whether the alpha values are increasing or decreasing in the Effect (i.e. fading in or fading out). If the 'Invisible' option is selected, the object emerges blurred and focusses to a sharp, solid object by the end of the Effect. If 'Visible' is selected, the object is sharp and solid at the beginning, blurring and fading to invisible by the end of the Effect.

Acceleration
Controls the blur speed at the start and at the end of the Effect.

·	At Start: accelerates the blur at the start of the Effect

·	At End: decelerates the blur at end of the Effect

·	Amount: controls the blur speed at the start and at the end of the Effect. A value of zero means no acceleration. A positive value accelerates at the start or decelerates at the end. A negative value decelerates at the start or accelerates at the end

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