iPhone HDR (“high dynamic range”) helps you get great shots, even in high-contrast situations. The best parts of three quick shots, taken at different exposures (long, normal, and short), are blended together into a single photo.
Use HDR. (iSight cameras and iPhone 5s FaceTime camera) Tap the HDR button at the top of the screen. For best results, keep both iPhone and the subject still. (The flash is turned off for HDR shots.)
On iPhone 5s, you can choose HDR Auto and iPhone will use HDR when it’s most effective.
Keep the normal photo in addition to the HDR version. Go to Settings > Photos and Camera.
HDR versions of photos in your Camera Roll are marked with “HDR” in the corner.