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# Adding Glow Effects with Optics

Use Optics to add glow effects around front clips composited over back clips. The shape of the glow is determined by the matte clip you select fcrbefore accessing the Optics menu.

To add a glow effect to a clip:

1. Select FX from the A/V Tools box and then click Optics.
2. Select the front, back, and matte clips, and a destination.

   The Optics menu appears.

3. By default, Front view is enabled when you open the Optics menu. Click Result to view the glow effect.
4. You can use the Front and Back buttons to enable or disable the front and back clips. You can also invert the matte by enabling Invert.
5. If required, use the Size and Intensity fields to adjust the size and intensity of the glow effect.
6. Adjust the noise factor to make the glow jitter in the processed clip.

   If you want to create a second processed clip where the glow jitters in a slightly different way from the first one, enable the Random button before processing the second clip.

7. If required, use the Transparency field to adjust the transparency of the front clip.
   NoteThe front clip must be enabled (see step 4).
8. Use the Interior Glow and Exterior Glow colour pots to change the colour of the glow. Click a colour pot to display the colour picker.

   The interior and exterior colours are blended.

9. Click Process.

   The result clips appear in the selected destination.