User Guide

ADOBE PREMIERE PRO 2.0
User Guide
295
Compound Arithmetic effect
The Compound Arithmetic effect mathematically combines the layer to which it is applied with another layer. The
Compound Arithmetic effect is intended only to provide compatibility with projects created in earlier versions of
After Effects that use the Compound Arithmetic effect. Using layer blending modes is usually more effective than
using the Compound Arithmetic effect.
Compound Arithmetic effect: Original images (left and center) and with Compound Arithmetic effect applied (right)
Adjust the following controls for the Compound Arithmetic effect:
Second Source Layer Specifies the video track to use with the current layer in the given operation.
Operator Specifies the operation to perform between the two layers.
Operate On Channels Specifies the channels to which the effect is applied.
Overflow Behavior Specifies how pixel values that exceed the allowed range are treated:
• Clip Indicates that the values are limited to the allowed range.
• Wrap Indicates that values exceeding the allowed range wrap around from full on to full off, and vice versa.
• Scale Indicates that the maximum and minimum values are calculated and the results are stretched down from
that full range to the range of allowable values.
Stretch Second Source To Fit Scales the second layer to match the size (width and height) of the current layer. If this
option is deselected, the second layer is placed at its source’s current size, aligned with the upper left corner of the
source layer.
Blend With Original Adjusts the opacity of the second source layer so it blends with the original layer.
Invert effect
The Invert (video) effect inverts the color information of an image. The Invert effect has the following settings:
Channel Specifies which channel or channels to invert. Each group of items operates in a particular color space,
inverting either the entire image in that color space or just a single channel.
• RGB/Red/Green/Blue Uses all of three additive color channels: red, green, and blue or an individual color channel
to specify the inverted areas of the image.
• HLS/Hue/Lightness/Saturation Uses the three calculated color channels: hue, lightness, and saturation or one
calculated color channel to specify the inverted areas of the image.
• YIQ/Luminance/In Phase Chrominance/Quadrature Chrominance Uses the NTSC luminance and chrominance
color space, where Y is the luminance signal, I is the in-phase chrominance signal, and Q is the quadrature chromi-
nance signals or the individual components of the color space to specify the inverted areas of the image.
• Alpha Inverts the alpha channel of the image. Alpha is not a color space.
Blend With Original Combines the inverted image with the original. You can apply a fade to the inverted image.