Retina Flash feature, first appeared in the iPhone 6s and 6s Plus, if necessary, allows you to turn the display of the smartphone into a flash for taking a selfie on the front (frontal) the camera.
In truth, front camera has always been a weak point of the iPhone. With the advent of the 5-megapixel FaceTime camera in the iPhone 6s, this problem has been resolved, and with the release of iPhone 7 (and still) frontalka allows you to take pictures with a resolution of 7 MP. Recall, that in previous generations was used 1,2 megapixel camera.
Whatever the resolution, if lighting is not enough, then the photos are of poor quality. The main iPhone camera has long been equipped with LED flash, can not be said about the camera FaceTime. Taking a selfie at a party or in a club using the iPhone has always been quite problematic due to the lack of light.
With the release of the iPhone 6s, Apple implemented the feature in iOS, existing in Photo Booth for Mac, thanks to which the screen lights up white to highlight the face when shooting a self portrait. Just like the main camera flash, before you choose the appropriate brightness and tone of light, Retina Flash automatically detects light levels using a pre-flash of neutral white. Often the screen lights up in an amber tint, which highlights the face more favorably, than ordinary white.
Retina Flash is activated in the same way, like the main camera flash – by clicking on the corresponding icon on the screen.
Additional backlight is indispensable when taking a selfie, however it is worth remembering, that the results may still be far from ideal, as always, when only one light source is used. However, brightly lit selfies are preferable to dark and blurry due to insufficient lighting.