9

262 Chapter 18: Effects and Environments
center or an arbitrary location set by the X and
Y Origin spinners. The Blur effect will apply the
least amount of blur to the cent er origin of the
effect and gradually increase the blur to the pix els
further away from the center. This can be used to
simulate motion blur caused by camera zoom.
Pixel R adius—Determines the intensity of the
Radius Blur effect. Increasing the value increases
the number of surrounding pixels that each pixel
willusetocomputeitsblur.Themorepixelsused
meansagreaterblurfortheimage.
Trail—Adds “direction” to your blur by weighting
more or less blur toward the center of the Blur
effect. Thisaddsastreakingeffectandcreates
the illusion that your objects or your camer a are
rapidly mov ing in a par t icular direction.
X/Y Origin—Specifies the center of the blur, in
pixels, with respect to the dimensions of the
rendered output.
None—Lets you specify an object whose center
serves as the center of the blur effect. Click this,
select an object, and then turn on Use Object
Center. T he object name appears on the button.
Cle ar —Removes the object name from the button
above.
Use Obj ect Center—When on, the object specified
by the None button (tooltip: Pick an object to
center on.) serves as the center of the blur effect. If
no object is specified and Use Object Center is on,
no blur is added to the rendered image.
Affect Alpha—Applies the Radial Blur effect to the
Alpha channel when tur ned on.
Blur Parameters rollout, Pixel Sele ctions panel
Whole Image—Affects the entire rendered image
whenchosen.ThisisusefulwhentheBlureffect
dims your rendered image. By using Brig hten and
Blend you can maintain the original colors of the
scene.
Brighten—Brightens the entire image.
Blend—Blends the Blur effect and the Whole Image
parameters with the original rendered image. This
can be used to create a soft-focus effect.