This is one of over 4598 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
Use the percentile component with a gradient to make interesting highlights and shadows in your image.
percentile, median, gradient, glow, shadow, directional, lighting