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Scheme of a circular gradient
Color (Radial and Circular) Defines the
colors used on page 6707 for an effect.
This is based on the RGB color system, but can also be set with HSV. Within
each set of gradient controls, there is a Radial and Circular Color gradient.
Radial Color works with Circular Color to produce the overall color for the
Lens Effects element.
Transparency (Radial and Circular) Varies the visibility of parts of the effect.
The transparency gradients only make use of brightness (or luminance) values,
which are essentially grayscale values. This black-to-white ramp of values
provides you with 256 levels of transparency for your effects. Just like the
Color gradients, both Transparency gradients are tied together to generate the
overall visibility of effect. See
Gradient Options on page 6702 .
Size Varies the size of specific parts of the Lens Effect. Most size gradients
are used to affect the radius of a lens flare part, such as a glow. Like
transparency gradients, only the brightness values are used to provide you
with 256 different sizes.
The Radial Size gradient, for example, works both like a Radial and Circular
gradient. This gradient is applied in a clockwise fashion, starting at 12 o'clock.
The values in the gradient are applied from the center of the effect toward the
6706 | Chapter 20 Video Post