Use Level to adjust the number of tonal levels for each channel to which Posterize will
map
existing colors.
Posterize Time
The Posterize Time effect locks a clip to a specific frame rate. Posterize Time is useful on
its
own as a special effect, but it also has more subtle uses. For example, 60-field video
footage can be locked to 24 fps (and then field-rendered at 60 fields per second) to give a
film-like look. This effect is sometimes called Strobe in hardware devices.
Animating the value of the Frame Rate slider can give unpredictable results. For this
reason, the only interpolation of the frame rate allowed is Hold.
ProcAmp
The ProcAmp effect emulates the processing amplifier found on standard video
equipment. This effect adjusts the hue, saturation, and luminance of a clip’s image.
Radial Blur
The Radial Blur effect produces a soft blur by simulating the effect of a zooming or
rotating camera. Select the Spin blur method if you want to blur along concentric circular
lines, as if rotating the camera. Select the Zoom blur method if you want to blur along lines
radiating from the center. Drag the dot in the Blur Center box to change the origin of the
blurring. You can also set the Amount of the blur from 1 to 100. With the Spin blur method,
this value reflects the degree of rotation; with the Zoom blur method, this value reflects
the intensity of the blur.
Ramp
The Ramp effect creates a color gradient, blending it with the original image contents.
Create linear or radial ramps and vary the position and colors of the ramp over time. Use
the Start and End of Ramp options to specify the start and end positions. Use the Ramp
Scatter control to disperse the ramp colors and eliminate banding.
Note: Traditionally, ramps do not broadcast well; serious banding occurs because the
broadcast chrominance signal does not contain sufficient resolution to reproduce the
ramp smoothly. The Ramp Scatter control disperses the ramp colors, eliminating the
banding apparent to the human eye.
Reduce Interlace Flicker
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 annoyingly when broadcast. Reduce Interlace Flicker
softens horizontal edges to reduce the flickering.
Note: Flicker may result from fields that have not been separated.
Remove Matte
The Remove Matte effect removes color fringes from clips that are premultiplied with a
color. It is useful when combining alpha channels with fill textures from separate files. If
you import footage with a premultiplied alpha channel, or if you create alpha channels
with After Effects, you may need to remove halos from an image. Halos are caused by a
large contrast between the image's color and the background, or matte, color. Removing
or changing the color of the matte can remove the halos.
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Adobe Premiere Pro Help Applying Effects
Using Help | Contents | Index Back 276
Use Background Color to specify the new background color when you want to change the
color of a matte.
