Yogi Berra (1925–2015)
OS X @2X

Nicely illustrated post by David Barnard on retina display Macs:

The point is, PPI is much less relevant on OS X than on iOS. To create Retina displays, Apple doesn’t have to build displays that are exactly 2X current displays, they just have to build displays that work well with OS X when running @2X. For example, the current 27-inch iMac is 2560 by 1440 pixels, which translates to 109ppi. Doubling that to 5120 by 2880 pixels is not strictly necessary. Such a screen might be incredibly difficult to manufacture, and therefore incredibly expensive. Instead, Apple could build a 3840 by 2400 pixel 27-inch screen that presented itself as a pixel doubled 1920 by 1200 pixel display. That’s effectively an 84ppi screen @1X and 168ppi screen @2X.

The key thing to keep in mind is that on iOS, the precise physical size of screen elements matters. A button rendered on an iPhone 4 uses four times the pixels as the same button rendered on an iPhone 3GS — but they’re the exact same size. That’s not a concern with the Mac, because the Mac is not a touchscreen device — and I don’t think it ever will be.

Saturday, 3 March 2012

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