ADOBE AFTER EFFECTS 7.0
User Guide
397
Blend With Original
Specifies the fading level between the blended image and the original image. A setting of 0%
shows only the secondary layer (or just the layers specified with Blend in Crossfade mode). At 100%, only the first
layer is visible. Changing this slider linearly over time gives you a standard crossfade. To try the other blending
modes, set Blend With Original to 0% to see the full effect of each mode.
Note:
You can create a crossfade without applying an effect by animating the Opacity property of one layer on top of
another. However, this doesn’t work if the frontmost layer has any transparent portions (which allows the other layer to
show through, even when at full opacity). The Crossfade mode creates a proper crossfade between two layers, even if both
have transparent regions.
If Layer Sizes Differ
Specifies how to position the layers. The layer’s quality setting affects Blend only if Stretch To Fit
is selected and if the layers are of different sizes. Stretching at Best quality is much smoother.
To use the Blend effect
1
Apply the Blend effect to one layer (A) in your composition, and choose the name of the other layer (B) in the
Blend With Layer menu.
2
Hide layer B by turning the Video switch off next to the layer in the Timeline panel.
Calculations effect
The Calculations effect combines the channels of one image with the channels of another. Use this effect to quickly
and easily produce some of the same results as you get from the Shift Channels effect, the Compound Arithmetic
effect, and precomposing.
This effect works with 8-bpc and 16-bpc color.
Original (left); Calculations effect applied to layer created from solid with Fractal Noise effect (center); result (right)
Adjust the following controls for the Calculations effect:
Input Channel
Specifies the channel to extract and blend with the original layer. RGBA displays all channels
normally. Gray shows the luminance of the original RGBA image. Red, Green, Blue, or Alpha converts all channels
to the value of the specified channel.
Invert Input
Inverts the layer before the effect extracts the specified channel information.
Second Layer
Specifies the layer with which Calculations blends the original layer.
Second Layer Channel
Specifies the channel to be blended with the input channels.
Second Layer Opacity
Specifies the transparency of the second layer.
Invert Second Layer
Inverts the second layer before the effect extracts the specified channel information and calcu-
lates the blend.
Stretch Second Layer To Fit
Stretches the second layer’s edges to the original layer’s edges before blending. If you
don’t select this control, the Calculations effect centers the second source layer in the original layer and crops it to fit
the effect layer’s boundaries.
