Adobe 12040118 - After Effects Standard, Руководство

Страница: 390 / 614

Channel effects
To the top
To the top
To the top
Additional resources about Channel effects
Arithmetic effect
Blend effect
Calculations effect
Channel Combiner effect
Compound Arithmetic effect
Invert effect
Minimax effect
Remove Color Matting effect
Set Channels effect
Set Matte effect
Shift Channels effect
Solid Composite effect
Third-party effects in this category included with After Effects:
CC Composite effect
See Third-party plug-ins included with After Effects.
Additional resources about Channel effects
Satya Meka provides the Separate RGB effect plug-in on the After Effects Scripts website . This effect—which was written with Pixel Bender—
offsets, scales, and rotates each color channel of an image separately.
Chris Forrester provides a video tutorial on his website that shows how to use the Channel Mixer, Shift Channels, and Set Matte effects to create
mattes from color ID passes from 3D applications. He also provides an animation preset that sets up the parameters in the Channel Mixer effect for
the use of an RGBCMY color ID pass.
Arithmetic effect
The Arithmetic effect performs various simple mathematical operations on the red, green, and blue channels of an image.
This effect works with 8-bpc color.
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 channel value of the pixel to the greater of the specified value and the original value of the pixel.
Min Set the channel value of the pixel to the lesser of the specified value and the original value of the pixel.
Block Above Set the channel value of the pixel to zero if the original value of the pixel is greater than the value specified; otherwise,
leave the original value.
Block Below Set the channel value of the pixel to zero if the original value of the pixel is less than the value specified; otherwise, leave
the original value.
Slice Set the channel value of the pixel to 1.0 if the original value of the pixel 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.
Screen Multiplies the complements of the channel values, and then takes the complement of the result. The result color is never darker
than either input color.
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 and layer styles.)