Απάντηση: Re: Απάντηση: Re: [ Επίσημο ] iPhone Xr
Δεν είμαι πεπεισμένος ότι η χαμηλότερη ανάλυση οθόνης υπάρχει για να σε σπρώξει στο μεγαλύτερο μοντέλο. Αν ήθελε αυτό, απλά θα εξόπλιζε το Xr με τον περσινό επεξεργαστή και όλοι θα ήταν χαρούμενοι διότι παραμένει πιο γρήγορος από τον ανταγωνισμό αλλά δεν έχει τις επιδοσεις του Α12 όποτε οι χαιενταδες θα πάνε στο Xs . Ίσως να παίζει κάτι με το scaling του iOS σε σχέση με τις ίντσες του Xr.Θα το ψάξω μήπως έχει γραφτεί κάτι σχετικό.
Τελικά, η επιλογή ανάλυσης του Xr σχετίζεται όντως με το 2X scaling του iOS, τουλάχιστον σύμφωνα με αυτό το άρθρο:
https://www.imore.com/iphone-xr-doesnt-have-1080p-display-explained
iPhone XR, which comes out in October, as a significantly lower screen resolution and density than iPhone XS and iPhone XS Max. That's depressed some people. It depresses me too. But maybe for different reasons.
Let's go back to 2010 and iPhone 4, the first Retina Display. There's been a whole lot of work done on high density and resolution independence by Apple and others, but what Apple did with iPhone 4 was incredibly straight forward and simple: T
hey doubled the amount of pixels in every point. Instead of @1x it was now @2x, and that was it. Sure, designers had to make @2x assets, but that wasn't a huge hurdle.
To understand the difference, imagine a point on a display. On the original iPhone up to iPhone 3GS, that point was drawn with a single pixel. On iPhone 4, that dot was drawn with 4 pixels. It didn't make a huge different for dots or squares, but for angles and curves, you could produce fidelity that was, literally, twice as good.
So good that, when you looked at them from typical viewing distances, the pixels disappeared and all you could see were clean angles and curves.
That's because Retina — or HiDPI — is a function not just of resolution and size, but distance. It's the same reason a 4K TV doesn't look much different than a 1080p TV of equal size if you're sitting more than 10 feet away. Increase the size or decrease the distance, then you start to see the difference.
Now, displays are expensive. Not just in terms of the cost for the part itself, but the power it takes to light it up and push its pixels around. Unless you need density for a specific use-case, like a VR headset where the distance is so close you need the resolution to be as high as technologically possible — 4K per eye, please! — you're just wasting power with any pixel most people can't discern at a normal viewing distance.
With iPhone 6 plus, Apple went to @3x internally. That means every point went from a 2x2 pixel grid to a 3x3 pixel grid. But, Apple only went to 1080p for the display. So, they used a scaler to take that @3x image and squeeze it down onto that 1080p display. Some people, the ones who were particularly sensitive, could see the scaling and the flicker it caused for single pixel lines. For most, it was fine.
For iPhone XS Max and iPhone XR, Apple is doing two very different things. For iPhone XS Max, Apple is letting @3x be @3x. The result is a 2688-by-1242-pixel resolution at 458 ppi. For iPhone XR, Apple is letting @2x stay @2x. That results in a 1792-by-828-pixel resolution at 326 ppi.
iPhone XS Max is literally the iPhone XS Super retina display with more pixels to fit a physically larger screen and iPhone XR is literally the iPhone 4/5/6/7/8 regular Retina display with more pixels to fit a physically larger screen.
So, you don't get the density of the Plus but you don't have to deal with the scaling either. Personally, I prefer the scaling, but I'm not the only person in the world and I don't every time get what I want.
Does this affect apps? No, not at all. Remember, points stay constant regardless of pixels. And app developers have all sorts of tools now, including size classes and auto-layout. So, @2x vs. @3x is meaningless for any of that.
Same with YouTube or any other video. Yes, you won't get pixel accurate 1080p video on an iPhone XR the way you would an iPhone Plus. Well, you wouldn't get it anyway because it's not 16:9 the way the Plus was, but pillar-boxing not withstanding, you will get either scaled up 720p or scaled down 1080p. (Any video service could choose to send either to an iPhone XR — 1080p would simply use more bandwidth but give you better interpolation.)
You'll have the same issue on an iPhone XS or iPhone XS Max, just stepped up. They're both bigger than 1080p but not big enough for 4K, so you'll get upscaled 1080p video or, maybe, downscaled 4K.
Will you notice the difference? Again, with the exception of VR headset use, not really, and those want 4K, probably closer to 8K per eye, and no phone display is anywhere near that.
The far, far bigger deal with iPhone XR is that it doesn't support HDR — because it's LCD and not OLED. Apple worked another engineering miracle making an LCD display without bezels that could stand up next to the iPhone X and iPhone XS displays — and I've used them all, and it really does — but LCD simply can't do HDR.
And it's High dynamic range, not high density, that really is the state of the art of video these days.
