This is one of over 4594 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 1.0 or higher installed on your computer. If you don't have it installed yet, click here to download Filter Forge
I wanted to prove that all the adjustment components but tone curve were unnecessary. I did so, and concluded that doing so was a waste of time. This filter will do nothing that can't be done better in Photoshop in 5 seconds, I offer it only that someone will look at its guts and learn.
curve threshold brightness contrast smooth hue saturation gamma levels
This filter has earned its author one of our rewards. They are given to the authors of popular filters and include a free copy of Filter Forge.