Here are parts of two answers I found on the web. True tone uses sensors . Every sensor in your phone uses battery . It's not just iPhone . Sensors are everywhere .
True tone won't affect your battery adversely , but it will use tiny bit of it . Not going to make much of a difference by turning it off . The ipad pro, iPhone 8 and iPhone X feature sensors that measure the ambient light color and brightness. The tablet or phone then uses this information to adjust its display. It can basically correct white point and illumination based on your environment lighting in order to render the right kinds of white under any light source. This technology isn't new, however, as some desktop monitors have been offering it for a long time. The thing to remember is that the human optical system is constantly comparing near-white to perfectly white, and that a "better" white can affect our perceived contrast of whatever we're looking at, meaning an adjusted white point should be more comfortable on our eyes. It also means that the new iPhones and iPad Pro should be more readable in direct sunlight, thus improving its usability ever so subtly. Here's how Apple explained<http://www.apple.com/pr/library/2016/03/21Apple-Introduces-9-7-inch-iPad-Pro.html> its True Tone/Retina display when it was first launched: "The 9.7-inch iPad Pro<https://www.amazon.com/s/ref=nb_sb_noss?field-keywords=ipad+pro&url=search-alias%3Daps> features advanced display technologies, including a True Tone display, which uses new four-channel sensors to dynamically adjust the white balance of the display to match the light around you for a more natural and accurate, paper-white viewing experience. The advanced Retina display is 25 percent brighter and 40 percent less reflective than iPad Air 2, making content even easier to see indoors and out. It uses the same wider color gamut as the iMac with Retina 5K display, delivering 25 percent greater color saturation for more vivid colours. A custom timing controller, photo alignment and oxide TFT deliver incredible color, contrast and clarity." "The real art of conversation is not only to say the right thing at the right place but to leave unsaid the wrong thing at the tempting moment." - Dorothy Nevill [Sent from my little hand-held computer] On Sep 16, 2018, at 3:06 AM, Dave <dave.beckett...@gmail.com<mailto:dave.beckett...@gmail.com>> wrote: Hi, recently updated, from the iPhone 6s, to iPhone 8. I was just wondering about the True Tone, and what does it do, and do i need it on? Is it just a sighted thing, and if i turn it off, will it save battery? Dave. -- The following information is important for all members of the V iPhone list. If you have any questions or concerns about the running of this list, or if you feel that a member's post is inappropriate, please contact the owners or moderators directly rather than posting on the list itself. Your V iPhone list moderator is Mark Taylor. Mark can be reached at: mk...@ucla.edu<mailto:mk...@ucla.edu>. 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