For the second photo, the exposure value is lowered. The bushes are shot sideways to blend with the subjects face from the first photo. Since the background was white in the first photo, any sections of the second photo overlapping the white from the first will be masked. When lining up your second photo, the “live preview” can be shown and hidden using the Live Preview Button making it easy to see the current photo being shot and lining up your composition. Additionally, the individual photos can be saved when shooting a double exposure by toggling the Individual Save Button (The third button on the top from the right).

Shoot your second photo by pressing the larger shutter button. This is the equivalent to shooting a photo on a film camera and winding to the next frame to start fresh for your next photo.

Double Exposure is not limited to double exposures. Triple, quadruple, quintuple… even centuple (100) exposures can be taken. These are normally referred to as multiple exposures. Since exposure values are accumulated when shooting multiple photos, it’s normally a good idea to keep your exposure levels low to avoid over exposing.

Using Photos From Your Library

In addition to using your iOS devices camera, photos from your library can also be used.

To do this, open your photo library and navigate to the photo you would like to use. After selecting the photo, you will be brought to the photo viewer. Here you can view your photos or use them in the editor menu by pressing the blue button at the bottom which looks like the shutters.

To use a photo from your library, navigate to the photo in the photo picker, select it, then in the viewer, press the blue button which looks like the two shutter buttons (Bottom of the second screenshot). This will allow you to edit your photo as well as use it in a multiple exposure.

From the editor menu, photos can be scaled, rotated and moved with pinch, twist and drag gestures. Exposure can be modified with the exposure compensation. The same shutter button options can also be used as if the photo was being taken with the camera.

In this sequence, a triple exposure is made with three photos from the library. The first two photos have an exposure compensation value of -2 applied. Since the photo is shot with a black background, the appear faded. The last photo has no exposure compensation applied to it.

Applying Filters to Your Photos

By pressing the filter button on the bottom right of the screen, you get a live preview the filters applied to your current photo. Adding filters to your multiple exposures will give your photos a unique look. Select your filter and shoot your photo similar to the way filters work with the native iOS camera.