Apple Final Cut Pro 7 - Manual (Page 1065)

Motion Blur allows you to create or exaggerate motion blur in ordinary video clips. For
example, if you apply motion blur to a clip in which someone is standing still and waving
an arm, the arm becomes blurred, while the rest of the image remains sharp. This happens
even though the arm waving is not a keyframed motion effect. Motion Blur also lets you
add motion blur to video clips that have none, such as computer animation that was
rendered without it.
Motion Blur can also add blur to layered clips that are moving because of keyframed
motion effects, such as animated motion along a path, rotation, changes in scale, or
distortion. This way, animated motion within Final Cut Pro can be given a more natural
look, as if the moving clips were actually recorded with a camera.
The amount of blur that appears in either case depends on the speed of the moving
subject. The faster the subject moves, the more blurred it becomes, similar to a motion
picture film or video image. The amount of blur that is added can be modified using two
parameters.
• % Blur: Affects the smoothness of the motion blur. A value of 1000 percent blurs motion
over 10 frames; a value of 100 percent blurs motion in one frame.
• Samples: Determines the detail of the applied motion blur, which is dependent upon
the speed of the motion effects applied to a clip. Additional samples appear as additional
layers of blurring. To change the number of samples, choose a number from the Samples
pop-up menu.
Tip: You can also use Motion Blur to soften the strobing effect that may appear in clips
with extremely slow motion applied to them.
Speed Parameters
The Speed parameters allow you to alter the speed of a clip to create fast- or slow-motion
effects. You can apply constant speed changes or speed changes over time. You can also
reverse the speed of a clip, making it play backward. For a detailed description of the
Speed parameters in the Motion tab, see
“Using the Speed Parameter in the Motion Tab.”
For more general information about the Speed feature in Final Cut Pro, see “Changing
Clip Speed.”
1065 Chapter 66 Changing Motion Parameters