This is one of over 4720 effects generated by Filter Forge, a Photoshop plugin that allows you to create your own filters.
To open this filter, you must have Filter Forge 2.0 or higher installed on your computer. If you don't have it installed yet, click here to download Filter Forge
A simple filter that makes a selected color transparent. Its is based around a Map Script component, which can come handy when developing more complex filters.
transparent, alpha, script