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I started using 1440x810 or 1280x720 resolutions on my 5k iMac. I somewhat expected better quality because I thought it would be 2x Retina. It looks like that is not the case.

I would like to know..how come lowering resolution on my 5k does not enable HiDPI and..is there a way to do so if this is configuration issue?

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    ppi is a physical display related property but not one of the graphics projected by the window server...so even if you'd use a 1x1 resolution the ppi of your 5k iMac still is ~218. – klanomath Aug 6 '17 at 2:31
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    @klanomath // In that case, I think I wasn't exactly asking PPI. When I was using lower PPI monitors before, I could make it look better by using HiDPI. How come I don't see that better quality when I go lower resolution (HiDPI) in 5k mac? – Moon Aug 6 '17 at 2:42
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    One explanation: What is HiDPI. it's a misconception to think that a 1440x810 resolution projected to a 5120×2880 display is better than a 2560x1440 resolution or a 5120×2880 resolution to the same display. In fact it's the opposite: projecting a 10240×5760 resolution to a 5120×2880 display is the best in terms of crispiness. You have to blow up all GUI elements (buttons/windows/fonts) by 2 of course to make them legible/usable. – klanomath Aug 6 '17 at 2:55
  • @klanomath that sounds like OS X is only optimized for certain resolutions in that case...? I actually am not following in detail.. – Moon Aug 6 '17 at 4:43

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