With this preset you can cause the opacity of a layer to control the brightness of a "Lens Flare".

Here are two presets knocking out black OR white from a layer based on the luminance to set it as transparent/alpha.

Creating a HD interstitial by using various masking and layering techniques.

Tracking and stabilizing footage plays important role in composition.

In this 3.5 minute video tip John Dickinson shows how you can look through a camera linked to a light.

Learn quick tricks of using Particular.
Attach the particular to butterflies leaving trails.
by Shoaib Khan

The Difference Matte effect creates a transparency a mask or a matte by comparing the pixels in a source layer with the pixel in a defined difference layer, and then keying out (eliminating) pixels in the source layer that match both the position and color in the difference layer.

This expression is customizable, and you can change many things including: the radius of the cylinder, the overall rotation of the cylinder, the spacing vertical spacing between rows of the cylinder, and the amount of layer on each level of the cylinder.