As convenient as smart-phone
photography may be, there’s one key weakness: Few phones offer exposure
settings. This leads to problems when dealing with harsh light and heavy
shadow.
Take a look at these two
images. The left photo was taken without “high dynamic range,” or HDR. The
brick walkway looks great, but the camera lost a lot of detail in the bright
and dark areas. The sky looks washed out. The flowers seem lost in shadow.
A professional could repair
this image with editing. But HDR tries to fix the image as it's being taken.
With
HDR on, a phone will snap three photos in rapid succession. Each image uses a
different exposure level. One shot is tuned for dark areas, such as the flowers
in the image above. One captures the bright spots, such as the sky. The third
goes for the mid-tones, much like the non-HDR photo.
After it snaps all three photos, the iPhone tries to identify the best aspects of each shot and stitches them into a single image.
After it snaps all three photos, the iPhone tries to identify the best aspects of each shot and stitches them into a single image.
While the final product is
rarely perfect, it's often much better than the original – with no extra work
required. If you're unhappy with the results, the iPhone actually saves two
images: the HDR version and the shot it would have taken without the feature.
Turn on HDR from the iPhone's
standard camera application by clicking "Options" then sliding the HDR
toggle.
Better exposure: Without
'high dynamic range' (left), details are lost in the shadows of this scene.
With HDR (right), you see more of the flowers and flag. (Ann Hermes/Staff)