Adobe AFTER EFFECTS CS3 PROFESSIONAL User Manual page 384

AFTER EFFECTS CS3 378
User Guide
The roundness of the edges of the iris.
Iris Blade Curvature
The rotation of the iris.
Iris Rotation
The size of the iris. Increase this value for greater blur.
Iris Radius
All pixels with a brightness value greater than Specular Threshold are treated as specular
Specular Threshold
highlights.
Brightness of specular highlights.
Specular Brightness
Film grain and noise are removed when you blur an image. To make the image look more realistic,
Noise controls
you may want to add noise back to the image so that it doesn't look retouched. To add noise, set Noise Amount, and
choose a noise type from the Noise Distribution menu. To add noise without affecting the color in your image,
choose Monochromatic Noise.
Stretches the control layer to the dimensions of the layer to which it is applied; otherwise, the
Stretch Map To Fit
control layer is centered on the affected layer.
Radial Blur effect
The Radial Blur effect creates blurs around a point, simulating the result of a zooming or rotating camera.
You can specify the level of anti-aliasing applied at Best quality; no anti-aliasing is applied at Draft quality. At Draft
quality, the blur appears somewhat grainy. You may prefer the draft results for special effects, but the grain may
flicker on interlaced displays.
This effect works with 8-bpc, 16-bpc, and 32-bpc color.
Original (left), and with effect applied (right)
Spin blurs in arcs around the Center point, as if the camera were rotating; Amount specifies degrees of rotation.
Type
Zoom blurs radially outward from the center point; Amount specifies the length of the blur.
Reduce Interlace Flicker effect
The Reduce Interlace Flicker effect reduces high vertical frequencies to make images more suitable for use in an
interlaced medium (such as NTSC video). For example, images with very thin horizontal lines can flicker when
broadcast. Reduce Interlace Flicker softens horizontal edges to reduce the flickering.
This effect works with 8-bpc color.
Note: Flicker may result from fields that haven't been separated.
See also
"Separate video fields" on page 79