Adobe AFTER EFFECTS 5.5 Help Manual page 372

Adobe After Effects Help
Using Help | Contents
Using layer-map RGB channels to alter multiple properties
independently (PB only)
In both the Persistent or Ephemeral Property Mappers, you can control up to three particle
properties independently by using a single RGB image as a layer map. Particle Playground
achieves this by extracting brightness values separately from the red, green, and blue
channels in the image. The Persistent and Ephemeral Property Mapper options map the
red, green, and blue channels to different properties through the individual color map
menus: Map Red To, Map Green To, and Map Blue To. You don't have to use all three
channels if you want to modify just one property. To change just one property or change
up to three properties using the same values, use a grayscale image as the layer map,
because the RGB channels are identical. For more information, see "Creating an RGB layer
map (PB only)" on page 375.
A
A. Layer map viewed in RGB mode. B. The red channel contains a spiral layer. C. The green channel
contains a horizontal-gradient layer map. D. The blue channel contains a vertical-gradient layer
map.
Using Affects options to specify particles (PB only)
Many Particle Playground properties include a group of settings under the heading
Affects that specify which particles are affected by an option. You can include or exclude
particles based on their properties.
Using the Older/Younger Than option to make particles older than a certain age (left) change color
(right)
To specify the particles that are affected by an option:
Under the property name, click the right-facing triangle next to Affects, and specify the
following settings:
Particles From Choose the particle generator or combination of particle generators
whose particles you want to be affected by the current option.
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