Adobe 25520388 User Guide - Page 354

Ghosting effect (Windows only), Sharpen effect, Unsharp Mask effect, Channel effects

Page 354 highlights

USING ADOBE PREMIERE PRO 349 Effects and transitions Ghosting effect (Windows only) The Ghosting effect overlays transparencies of the immediately preceding frames on the current frame. This effect can be useful, for example, when you want to show the motion path of a moving object, such as a bouncing ball. Keyframes cannot be applied to this effect. Sharpen effect The Sharpen effect increases the contrast where color changes occur. Unsharp Mask effect The Unsharp Mask effect increases the contrast between colors that define an edge. Original (left), and with effect applied (right) Radius The distance from the edge at which pixels are adjusted for contrast. If you specify a low value, only pixels near the edge are adjusted. Threshold The greatest difference between adjacent pixels for which contrast isn't adjusted. A lower value produces a greater result. A value that is too low causes an adjustment to the contrast of the entire image. A low value can also generate noise or cause unexpected results. Channel effects Arithmetic effect The Arithmetic effect performs various simple mathematical operations on an image's red, green, and blue channels. Operator The operation to perform between the value you specify for each channel and the existing value of that channel for each pixel in the image: • And, Or, and Xor Apply bitwise logical operations. • Add, Subtract, Multiply, and Difference Apply basic math functions. • Max Set the pixel's channel value to the greater of the specified value and the pixel's original value. • Min Set the pixel's channel value to the lesser of the specified value and the pixel's original value. • Block Above Set the pixel's channel value to 0 if the pixel's original value is greater than the value specified; otherwise, leave the original value. • Block Below Set the pixel's channel value to 0 if the pixel's original value is less than the value specified; otherwise, leave the original value. • Slice Set the pixel's channel value to 1.0 if the pixel's original value is above the specified value; otherwise, set the value to 0. In both cases, the values for the other color channels are set to 1.0. • Screen Apply a screen. Clip Result Values Prevents all functions from creating color values that exceed the valid range. If this option isn't selected, some color values may wrap around. Last updated 1/16/2012

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349
USING ADOBE PREMIERE PRO
Effects and transitions
Last updated 1/16/2012
Ghosting effect (Windows only)
The Ghosting effect overlays transparencies of the immediately preceding frames on the current frame. This effect can
be useful, for example, when you want to show the motion path of a moving object, such as a bouncing ball. Keyframes
cannot be applied to this effect.
Sharpen effect
The Sharpen effect increases the contrast where color changes occur.
Unsharp Mask effect
The Unsharp Mask effect increases the contrast between colors that define an edge.
Original (left), and with effect applied (right)
Radius
The distance from the edge at which pixels are adjusted for contrast. If you specify a low value, only pixels near
the edge are adjusted.
Threshold
The greatest difference between adjacent pixels for which contrast isn’t adjusted. A lower value produces a
greater result. A value that is too low causes an adjustment to the contrast of the entire image. A low value can also
generate noise or cause unexpected results.
Channel effects
Arithmetic effect
The Arithmetic effect performs various simple mathematical operations on an image’s red, green, and blue channels.
Operator
The operation to perform between the value you specify for each channel and the existing value of that
channel for each pixel in the image:
And, Or, and Xor
Apply bitwise logical operations.
Add, Subtract, Multiply, and Difference
Apply basic math functions.
Max
Set the pixel’s channel value to the greater of the specified value and the pixel’s original value.
Min
Set the pixel’s channel value to the lesser of the specified value and the pixel’s original value.
Block Above
Set the pixel’s channel value to 0 if the pixel’s original value is greater than the value specified;
otherwise, leave the original value.
Block Below
Set the pixel’s channel value to 0 if the pixel’s original value is less than the value specified; otherwise,
leave the original value.
Slice
Set the pixel’s channel value to 1.0 if the pixel’s original value is above the specified value; otherwise, set the
value to 0. In both cases, the values for the other color channels are set to 1.0.
Screen
Apply a screen.
Clip Result Values
Prevents all functions from creating color values that exceed the valid range. If this option isn’t
selected, some color values may wrap around.