>BTW, iPhone 4 is a 3.5 inch 640×960 resolution (326 ppi). But the new iPad ... | Hacker News

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		eurleif on March 22, 2012 \| parent \| context \| favorite \| on: WebKit Limit on Retina JPG Image Display >BTW, iPhone 4 is a 3.5 inch 640×960 resolution (326 ppi). But the new iPad is 264 PPI.

brianpan on March 22, 2012 | [–]

I included the screen size, because it's a proxy for working distance, and thus pixel density per viewing angle.

http://punchingin.com/chasing-the-6-4-megapixel-unicorn/

http://www.codinghorror.com/blog/2012/03/welcome-to-the-post...

davidmp on March 22, 2012 | [–]

iPad is "retina" at a viewing distance of 15 inches. iPhone is "retina" at a viewing distance of 10 inches.

Pixel density is only half the equation.

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