Bad values for iPad Air

[Patidou]

Your page test show me 192 DPI, normally it should be 264. ;-)

[ryanve]

Thanks @Patidou. What indicates that 264-dpi is correct? Could this relate to #1? What's the window.devicePixelRatio on that page?

[Patidou]

I found the value here : https://www.apple.com/ipad-air/specs/ and here : http://mydevice.io/devices/

I don't use zoom.

window.devicePixelRatio value is 2.

[raphaelgoetter]

Confirmed : iPad Air has a 264dpi/ppi resolution :
http://en.wikipedia.org/wiki/List_of_displays_by_pixel_density#Apple

[ryanve]

@Patidou res detects CSS resolution. 1dppx equals 96dpi. devicePixelRatio equals dppx. 192dpi is correct per those relations. For Apple's advertised quantities to make sense, 264 must be physical ppi.

20482 + 15362 = 25602
9.7in * 264ppi ≈ 2560px

@raphaelgoetter Using ppi as that header on mydevice.io/devices might reduce confusion. dpi/ppi looks like division.

[Patidou]

I have learned things. ;-)

Thanks for the explanations and sorry for the noises. :)

[ryanve]

No problem @Patidou =) Retina hype adds confusion. I prefer to design by dimensions and not worry about dpi. Images look great on iPads regardless.

[raphaelgoetter]

@Patidou : have you tried http://dpi.lv/ with your iPad Air ? What's the result ?

@ryanve : thank you, I added a new column : "CSS ppi" in the tables : http://mydevice.io/devices/

[Patidou]

@raphaelgoetter by default, it's 192 dpi on… 13,3'' screen size. ;-) Wih the correct screen size it's 264 dpi. :)