![]() Some things are already resolution independent by being vectors, text for example. Doubling the density of the iPhone would have just made it unusable, Apple had to add resolution independence, allowing for twice the pixels to render the same item on the screen. Of course just having a higher density screen won't make a difference. And the iPhone is actually about 40dpi past what is needed. DeviceĪs you can see, it isn't that much in many cases. Remember, this is for someone who has 20/20 vision, so for a lot of people this figure may be lower. So using this calculation and what I consider are comfortable and reasonable distances I've calculated the minimum resolution at which pixels are indistinguishable. To get the retina display effect dpi "x" for a screen "n" inches away we just do: I am going to calculate this for 4 devices: an iMac (desktop monitor), a MacBook pro (laptop monitor) and iPad (tablet) and an iPhone (smart phone). We also learn that we can calculate the dpi needed for individual pixels to be indistinguishable at a certain distance. Calculating the DPIįrom that blog post we can gain the scale factor of 3438, which is based off 20/20 vision (note this isn't perfect vision, but few people have eyesight that good). ![]() As such, if you put an iPhone 4 right up to your eye, you can still make out individual pixels.įor a good explanation of all of this, and for where I got the basis of my calculations, I highly recommend reading this blog post. ![]() But whereas with motion, the human eye can only see roughly 24 frames a second no matter what, with motion its limit is a function of the distance to the object and the quality of the eye. All a retina display is doing is taking advantage of the limited resolution of the human eye, much in the same way that a film takes advantage of the limited frame rate of the human eye. Now these are important for calculating what defines a retina display for various devices. Now retina display is a marketing term of Apple's, but for the purposes of this blog post I'm going to define a "retina display" as so: A display where a person with 20/20 vision is unable to tell apart individual pixels at a normal viewing distance There is a misconception that in order to get the effect of the retina display on the iPhone you need a display that is 326 dpi (dots per inch), regardless of the device. Looking for a freelance iOS/Mac developer? Get in touch! Retina Displays And Resolution Independence posted on
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