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Hack 23 Multiple Exposures, Digital Style
If you're looking for the multiple-exposures setting on your digicam, forget about it. It
probably isn't there, unless you own a Fuji pro SLR camera or one of a handful of other
models with this capability. So, what's the creative digital photographer to do?
In the film world, multiple exposures are a great way to create interesting, unexpected visual
effects. Traditionally, this was done either in-camera by exposing one frame of film many
times, or in the darkroom by sandwiching negatives together.
Unfortunately, most digital cameras don't support multiple exposures. But that
doesn't mean
it can't be done. Photoshop, the digital darkroom of choice for many, comes to the rescue.
There are a couple ways to approach gathering your source material for Photoshop. You can
previsualize the final image you're after, shoot its parts (layers) with your digital camera, and
then assemble these layers on the computer. Or, if you just want to experiment, grab a few
pictures out of your existing library, mush them together, and see what happens. Suddenly,
every digital image in your photo library becomes potential fodder for an interesting photo
montage.
2.9.1 Assembling Multiple Images into a Montage
For the first option, we're going to shoot three images, as illustrated in Figure 2-13 .
Figure 2-13. A photo montage
As you shoot, try to imagine each shot layered on top of the next one, resulting in an
interesting image. For each shot, we're going to underexpose by a factor of 2. Set your
exposure compensation to -2 and take three different shots. You've now captured three
underexposed images that, when added together, will create one well-exposed image.
Bring these pictures into your computer, start up Photoshop, and open each one in turn.
Copy two of the images and paste them into the first. You should now have a single image
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