Here are some shots I took to see what difference HDR would make.
Winner: Neither. It's a draw.
(Side note: I swear these shots were taken at East Coast Park. You may ask, since when did waters of East Coast look like either of these shots? I'm asking myself the same question. I don't remember the waters looking quite so gorgeous that day either.)
Non-HDR: Beautiful sky. Almost postcard perfect blue.
HDR: Sky is washed out and the boy has a weird ghosting effect because he is moving on the skate scooter. Interestingly enough, the cyclists in the background are very sharp even though they are in motion.
Conclusion: HDR certainly works well in some situations by showing detail that you would not otherwise get from a single exposure. However, it doesn't work in all shots. Because the iPhone takes two photos in very quick succession, motion will cause ghosting. Also, the algorithm that merges the two shots might bring more detail, but can also cause colours to flatten as well.
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