GradientRadial In the S_Gradient Plugin. Makes a smooth radial color gradient in an ellipse shape, given Center, Inner Radius, and Outer Radius parameters, and optionally combines the gradient with a background clip. Increase Add Noise to reduce banding artifacts in the gradient due to color quantization. Inputs: Back:  The clip to combine the gradient with.

Parameters:

Center:   X & Y,   Default: [0 0],  Range: any,  Shared.
The center location of the ellipse shape. This parameter can be adjusted using the Center Widget.

Inner Radius:   Default: 0.2,  Range: 0 or greater,  Shared.
Distance from the center that the gradient starts. This parameter can be adjusted using the Inner Radius Widget.

Outer Radius:   Default: 0.5,  Range: 0 or greater,  Shared.
Distance from the center that the gradient ends. This parameter can be adjusted using the Outer Radius Widget.

Add Noise:   Default: 0,  Range: 0 or greater,  Shared.
If positive, this amount of noise is added to the gradient. This can create a grainy effect and eliminate banding in the gradient due to quantization. Set this to 1.0 to enable effective debanding for 8 bit results.

Smooth Curve:   Default: 0,  Range: 0 to 1,  Shared.
If zero, a linear interpolation is used across the screen between the Start and End Color. Increase this value to use a smoother 'S' shaped curve for interpolation which can reduce the visual perception of the gradient's Start and End locations.

Rel Width:   Default: 1,  Range: 0.1 or greater,  Shared.
The relative horizontal size of the ellipse shape. Increase for a wider ellipse, decrease for a taller one.

Rel Height:   Default: 0.75,  Range: 0.1 or greater,  Shared.
The relative vertical size of the ellipse shape. Increase for a taller ellipse, decrease for a wider one.

Rotate:   Default: 0,  Range: any,  Shared.
Rotation in degrees of the ellipse. Note that rotation will have no effect when Rel Width and Rel Height are equal and the shape is a perfect circle. This parameter can be adjusted using the Rotate Widget.

Brightness:   Default: 1,  Range: 0 or greater,  Shared.
Scales the brightness of the gradient image (both the Inner Color and Outer Color).

Inner Color:   Default rgb: [1 1 1],  Shared.
The gradient color at the Inner Radius.

Outer Color:   Default rgb: [0 0 0],  Shared.
The gradient color at the Outer Radius.

Combine:   Popup menu,  Default: Grad Only.
Determines how the gradient is combined with the background.

Grad Only:  gives the gradient image alone with no background.

Mult:  the background is multiplied by the gradient.

Add:  the background is added to the gradient.

Screen:  the background is blended with the gradient using a screen operation.

Difference:  the result is the difference between the background and gradient.

Overlay:  combines gradient and background using an overlay function.

Scale Back:   Default: 1,  Range: 0 or greater,  Shared.
Scales the brightness of the background before combining it with the gradient.

See Also:

Gradient GradientMulti

GradientMulti SpotLight Vignette

Sapphire Plug-ins Introduction

© 2010, GenArts, Inc. All rights reserved.