Knoll Unmult is a free plug-in from Red Giant Software that recreates the opacity or alpha channel of a layer based on luminance also called brightness of the lens flare. Unmult assumes that the lens flare is rendered against black. The image is also adjusted to compensate for the new alpha channel. It is now available in 32 bpc and is updated for Intel Macs!
If you’re interested in more free plug-ins, check out our recently relaunched Plug-in Finder’s Free Plug-ins page.
