You can totally customize your settings, use a formulated preset, or a combination of both. If you find one that you create useful, you can create a customized preset, and save it for later use. You can export, or email a user setting if you need to share.
Exposure has five tabs. The first is "Settings" and is the most basic of all of all. Here you choose a film style and it is applied to the preview. You can then stop there, and you will have the Alien Skins rendition of that type of film. It would appear that there are many hours of work that went into matching these film types, and as such, would be a perfectly good place to stop as well.
On the other hand, if you are like me, good enough is, well, never good enough. So the other tabs were made for people like me. The "Color" tab for color film covers color casts and saturation. You have a set of sliders that manipulate the overall intensity, filter density and saturation. For Black and White, this controls the conversion of color images to Black and White.
On the Black and White Film filter, you also have an Infrared Tab that controls special effects that simulate infrared film. This of course is only a close approximation, since there is no infrared information contained in your image.
The Tone Tab controls items like contrast, brightness, shadows, and highlights. There is a curve editor that displays how input brightness is converted to output brightness. You can manipulate the full spectrum with RGB, or you can manipulate a channel at a time.
The Focus Tab contains controls for sharpening and blurring an image. You control the amount, the radius, and threshold when sharpening, and the Opacity and radius when blurring.
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