Images can be ruined if the lighting or exposure is not correct.
Smartphones have an easy method to adjust the lighting whilst you are taking a photo.
Your subject can be too dark when the sun is behind as the automatic lighting attempts to set the exposure to is correct for all of the image.
So if the sun is behind the subject the automatic adjustment can make the subject too dark.
Tapping on the subject adjusts the light level for the subject and transforms your image.
Watch this short tutorial video to see how to adjust the lighting whilst taking a photo with your smartphone.