Adobe After Effects CS3 - Manual (Page 387)

AFTER EFFECTS CS3
User Guide
382
• Block Above Set the pixel’s channel value to zero 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 zero 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 zero. In both cases, the values for the other color channels are set to 1.0.
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.
Blend effect
The Blend effect blends two layers using one of five modes.
You can blend layers more easily and quickly using blending modes, but you can’t animate blending modes. The
advantage of using the Blend effect is that you can animate it. (See “Blending modes” on page 163.)
This effect works with 8-bpc and 16-bpc color.
Original (top left), matte created with Fractal Noise effect on a solid layer (bottom left), and result of Blend effect with Mode set to Crossfade
(bottom right)
Blend With Layer The layer to blend with (the secondary or control layer).
Note: To use a layer as a control layer for the Blend effect but not show the layer in the rest of the composition, deselect
the control layer’s Video switch
. (See “Layer switches and columns in the Timeline panel” on page 147.)
Mode Blending mode:
• Color Only colorizes each pixel in the original image based on the color of each corresponding pixel in the
secondary image.
• Tint Only is similar to Color Only but tints pixels in the original image only if they’re already colored.
• Darken Only darkens each pixel in the original image that is lighter than the corresponding pixel in the secondary
image.
• Lighten Only lightens each pixel in the original image that is darker than the corresponding pixel in the secondary
image.
• Crossfade causes the original image to fade out while the secondary image fades in.