AJ_EVO: I just came to that same calculation of 216.966. So, looks like those numbers are accurate.
jkid: Apparently the true maximum resolution the eye can see at 12 inches is about 477ppi.
What prompted me to calculate this number is this article over at Wired:
iPhone 4’s ‘Retina’ Display Claims Are False Marketing | Gadget Lab | Wired.com
Basically, they talked to a physicist about the limits of the human eye and even Apple isn't at the limit yet.
Soneira - the guy in the article - has a Ph.D. in physics, a career in television, and presently makes money selling calibration solutions for displays.
He's a great guy, per his published words, but he's not infallible (I can cite references to this if it's really that important to anyone - my point is, yes, he's no fool, but neither do his word rise above fact-checking, no one has that throne) and neither is he above making his point in his own way.
He knows full well - and left out of that article - that:
- visual acuity is influenced by brightness
- and that no one can relate to cycles
How about this for a rule of thumb for visual acuity? The eye resolves down to about one arc-minute. Soneira arrives at 477 ppi at 12" - I come up with 445 ppi, but I may have missed something, I was counting on my fingers.
Oh - did we leave out the part that this application is for a display emitting light as opposed to reflecting it? Did we leave out the part that that form of measurement was intended for static lines?
Try it for yourself, boys and girls - tell me how close you - personally - have to get to make out individual pixels reliably on your Evo.
Use the white lettering below your home screen icons identifying the widget or app.
Measure it out at 12". Use your kickstand.
And tell me if you see solid, crisp lines on the small text at 12" or if you see dots.
Now - pull it in to 6" from your face.
Now - put it at your usual distance of usage.
And tell me if a little common sense and a simple experiment you can do all by yourself won't just poke holes in this latest display myth.
And tell me if Soneira and Wired aren't making money by just cashing in on Apple hype.
Yes - there is such a thing as wasted resolution.
And in all of the slight of hand, they left out this detail, pretty well known in HDTV circles - certainly well-known by Soneira, as he too has published on this, as I recall -
What are the contributors to perceived detail,
in order of importance?
According to the Imaging Science Foundation, the four contributors to perceived visual detail, in order, are:
- Contrast ratio
- Color saturation
- Color accuracy
- Resolution
Resolution is the dead-last contributor to perceived detail.
What does it tell you when that's the #1 thing that someone touts trying to get you believe their display has higher detail?
What does it tell you when you start to believe them instead of looking up a few facts outside of the script they're giving you to read from?
Think independently.
Think Android.