S_GlowNoise Glowing light is generated from areas of the source clip that are brighter than the given threshold. The glows are also attenuated by a solid noise texture to give them a noisy or grainy effect. If the Jitter Frames parameter is positive, the noise will be regenerated for each frame for a fizzling look. If Jitter Frames is zero, two noise textures are combined and slide over each other at a rate depending on the Spread Speed. In the Sapphire Lighting effects submenu. Inputs: Source:  The current layer.   The input clip that determines the glow locations and colors. This clip is also used as the background and the glows are layered back onto it. Background:  Defaults to None.   The clip to combine the glows with. If no background is given, the Source is also used as the Background. Matte:  Defaults to None.   If provided, the source glow colors are scaled by this input. A monochrome matte can be used to choose a subset of Source areas that will generate glows. A color matte can be used to selectively adjust the glow colors in different regions. The matte is applied to the source before the glows are generated so it will not clip the resulting glows.

Parameters:

Brightness:   Default: 2,  Range: 0 or greater.
Scales the brightness of all the glows.

Color:   Default rgb: [1 1 1].
Scales the color of the glows. The colors and brightnesses of the glows are also affected by the Source and Matte inputs.

Threshold:   Default: 0,  Range: 0 to 1.
Glows are generated from locations in the source clip that are brighter than this value. A value of 0.9 causes glows at only the brightest spots. A value of 0 causes glows for every non-black area.

Threshold Add Color:   Default rgb: [0 0 0].
This can be used to raise the threshold on a specific color and thereby reduce the glows generated on areas of the source clip containing that color.

Glow Width:   Default: 36,  Range: 0 or greater.
Scales the glow distance. This and all the width parameters can be adjusted using the Width Widget. Note that a zero glow width still enhances the bright areas; set the brightness parameter to zero if you want to pass the Source through unchanged.

Width X:   Default: 1,  Range: 0 or greater.
Scales the horizontal glow width. Set to 0 for vertical only.

Width Y:   Default: 1,  Range: 0 or greater.
Scales the vertical glow width. Set to 0 for horizontal only.

Width Red:   Default: 1,  Range: 0 or greater.
Scales the red glow width. If the red, green, and blue widths are equal, the glows will match the color of the source clip. If they are not equal, the glows will vary in color with distance.

Width Green:   Default: 1.2,  Range: 0 or greater.
Scales the green glow width.

Width Blue:   Default: 1.4,  Range: 0 or greater.
Scales the blue glow width.

Subpixel:   Check-box,  Default: off.
Enables glowing by subpixel widths. Use this for smoother animation of the Width parameters.

Noise Amplitude:   Default: 1,  Range: 0 or greater.
The amplitude of noise to include in the glows.

Noise Frequency:   Default: 40,  Range: 0.1 or greater.
The spatial frequency of the noise texture. Increase for finer grain, decrease for coarser grain.

Noise Freq Rel Y:   Default: 1,  Range: 0.02 or greater.
The relative vertical frequency of the noise texture. Increase to stretch it horizontally or decrease to stretch it vertically.

Noise Octaves:   Integer,  Default: 1,  Range: 1 to 10.
The number of octaves of noise to include. Each octave is twice the frequency and half the amplitude of the previous.

Noise Seed:   Default: 0.123,  Range: 0 or greater.
Used to initialize the random number generator. The actual seed value is not significant, but different seeds give different results and the same value should give a repeatable result.

Noise Shift:   X & Y,   Default: [0 0],  Range: any.
The horizontal and vertical translation of the noise texture. This can only be observed if Jitter Frames is zero.

Spread Speed:   X & Y,   Default: [72 0],  Range: any.
The rate and direction that two noise textures slide over each other. This has no effect unless Jitter Frames is zero.

Jitter Frames:   Integer,  Default: 1,  Range: 0 or greater.
If this is 0, the noise texture will remain the same for every frame processed. If it is 1, a new noise texture is used for each frame. If it is 2, a new noise texture is used for every other frame, and so on.

Affect Alpha:   Default: 1,  Range: 0 or greater.
If this value is positive the output Alpha channel will include some opacity from the glows. The maximum of the red, green, and blue glow brightness is scaled by this value and combined with the background Alpha at each pixel.

Glow From Alpha:   Default: 0,  Range: 0 to 1.
Set to 1 to generate glows from the alpha channel of the source input instead of the RGB channels. In this case the glows will not pick up color from the source and will typically be brighter. Values between 0 and 1 interpolate between using the RGB and the Alpha.

Glow Under Source:   Default: 0,  Range: 0 to 1.
Set to 1 to composite the Source input over the glows.

Light Background:   Default: 0,  Range: 0 to 1.
Increase this to give a look of the glow casting light onto the background image. To see this more clearly you can also lower the Background Scale parameter or raise the Brightness parameter.

Source Opacity:   Default: 1,  Range: 0 to 1.
Scales the opacity of the Source input when combined with the glows. This does not affect the generation of the glows themselves.

Bg Brightness:   Default: 1,  Range: 0 or greater.
Scales the brightness of the background. This parameter only has an effect if the background input is provided, and is visible due to a partially transparent Source image or a reduced Source Opacity parameter value.

Invert Matte:   Check-box,  Default: off.
If on, inverts the Matte input so the effect is applied to areas where the Matte is black instead of white. This has no effect unless the Matte input is provided.

Expand Borders:   Check-box,  Default: off.
If enabled, transparent borders are added to the input image before processing. This allows the result to include soft edges beyond the original image size. When off, the effect only occurs within the frame and the result will retain an edge at the borders. This parameter does not appear in FCP or DF because those applications don't support image expansion.

Opacity:   Popup menu,  Default: Normal.
Determines the method used for dealing with opacity/transparency.

All Opaque:  Use this option to render slightly faster when the input image is fully opaque with no transparency (alpha=1).

Normal:  Process opacity normally.

As Premult:  Process as if the image is already in premultiplied form (colors have been scaled by opacity). This option also renders slightly faster than Normal mode, but the results will also be in premultiplied form, which is sometimes less correct.

Show Glow Width: Check-box, Default: off.
Turns on or off the screen user interface for adjusting the Opacity parameter.This parameter only appears on AE and Premiere, where on-screen widgets are supported.

See Also:

Glow GlowDist GlowRainbow GlowAura GlowRings GlowDarks GlowOrthicon GlowEdges

Glint Sapphire Plug-ins Introduction

© 2007, GenArts, Inc. All rights reserved.