This effect was generated in Filter Forge, a Photoshop plugin that allows you to create your own filters.
This is an art filter. It was designed around a photo by Danny Raphael, from RetouchPro.com. The photo was of a train tracks running through a woods during the fall, with all the leaves turning their brightly colored hues. Thus the name for this filter.
It may not work well with other images and photos. I've tested it on a couple others and seems to have some merit, so I'm releasing it as is.
The filter's primary components are high pass and refraction, with a twist of a tone curve and impulse curve thrown in for tinting.
I hope you enjoy it.
Craig Kraellin Walters fall colors tint high pass refraction tone curve