Hello, I noticed that sometimes when I took one photo, my iPhone 6s+ took two automatically. One has a HDR mark on the top right and the other without. Could you please let me know the reason? What is the different? Which one is better?
Sometimes when the iPhone takes a HDR pic, it doesn't look better than a regular picture. So it leaves both, and you can delete the one that doesn't look as good.
If you go into Settings > Camera, I think there's an option to turn off it leaving the non-HDR photo.
When taking HDR photos there is the option to keep the non HDR photo as well. As aristocrat said, you'll find the option in Settings>Photos and Camera. Scroll down to the bottom.