# Shimmer Effect
The Shimmer effect allows you to run a recurring line of light across your image in a certain direction.
# Effect Settings
- Blend mode: Determines the way in which the effect is blended into the image.
- Style: Allows you to change between a linear and a mirrored (back-and-forth) behavior.
- Opacity mask: The opacity mask allows you to limit the effect to only certain parts of the image.
- Time offset: Allows you to draw a mask where the shimmering light moves at a different speed. Once you add this time offset map to your effect, the Timescale option will appear further down in the effect settings.
- Gradient map: Defines the appearance of the light shimmer. Click on Browse to view alternate versions that you can use. Ideally the gradient map for this effect is black and white.
- Brightness: The strength of the shimmer of light.
- Color: The color of the light.
- Delay: Defines the time scale between light shimmers.
- Direction: The direction in which the light shimmer moves.
- Granularity: The refinement of the light shimmer, higher values result in a smaller shimmer.
- Offset: A time offset, this is useful if you have multiple shimmers of light and want them to start with a slight delay between each other.
- Speed: The speed of the light shimmer movement.
- Timescale: Only visible when a time offset map has been drawn in the effect settings above. Defines the scale at which time is distorted through the time offset map.