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Using the Glow Effect

In its most basic form, the Glow effect brightens the pixels in and surrounding the brightest areas of an image. This can make objects appear to glow or make footage look like it was shot overexposed with a diffusion filter. However, the Glow effect includes a number of parameters that can vary the effect greatly. For example, you can base the glow on the alpha channel, and you can assign colors to the glow. The following section outlines the basic steps for using the Glow effect. Other effects are described in a separate task.

To apply a basic Glow effect:

Select an image layer (Figure 16.55).

Figure 16.55. Select an image to which you'll apply the Glow effect.

Choose Effect > Stylize > Glow (Figure 16.56).

Figure 16.56. Choose Effect > Stylize > Glow.

The Glow effect appears selected in the Effect Controls window. By default, the glow is based on Color Channels.

Set the Glow Threshold to specify the limit of brightness to which the glow is applied (Figure 16.57).

Figure 16.57. Set the glow threshold to specify how bright pixels must be to receive the Glow effect.

A low percentage value creates more glow; a high percentage value creates less glow.

Set the Glow Radius to control how far the glow effect extends from the bright areas.

Higher values create a more diffuse glow.

Set the Glow Intensity to control the brightness of the glow.

Higher values create a brighter glow.

To specify the direction the glow extends, choose an option from the Glow Dimensions pull-down menu (Figure 16.58):

  • Horizontal and Vertical

  • Horizontal

  • Vertical

Figure 16.58. Choose a direction for the glow.

The brighter areas of the image glow (Figure 16.59).

Figure 16.59. Brighter areas appear to glow.



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