The iPhone 4S has a built-in HDR option that works quite well. But, by using the following technique, you can maximize its potential, taking your camera phone images to a new level.
Begin in the Settings dialog for the iPhone. Tap on the Photos icon. Scroll down to the HDR section and make sure that "Keep Normal Photo" is set to "On." When you take an HDR image with your iPhone, you'll now get two images: the original non-HDR shot (normal photo), and the processed image. These two shots will build the foundation for the next step.
Now it's time to go take some great shots with HDR turned on for your iPhone. When you return home, you'll have two images for each picture. Open both of those shots in your favorite HDR program. I use HDR Pro in Photoshop CS5.
By having two shots with different dynamic ranges, you're able to get even more out of the composition than you could with the original HDR produced by the iPhone. Once you get the image the way you want, save it and share. People will be impressed that you captured such beautiful landscapes with your humble mobile phone.
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