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Is it even physically possible to notice the difference in that ppi at that range? I thought human eyes didn't have the capability. I think everyone saying "ye

by mitchty 12y ago

Is it even physically possible to notice the difference in that ppi at that range? I thought human eyes didn't have the capability. I think everyone saying "yes I see a difference" should be doing some double blind validation. I've had people tell me they could tell the difference between 720p and 1080p at 20 feet. That is physically impossible for the human eye.

personZ 12y ago
Most people don't watch their set from 20 feet away. And position is seldom static -- I tend to stand during football games, for instance, and move closer during intense plays or close-call replays. The same thing happens with smartphones, where people pull it in tight to look at fine detail, and a very high DPI allows you to do that with endless zooming/unzooming.
boyaka 12y ago
Screen size!!! TVs are getting bigger. The factors involved are: - PPI/resolution - Media quality/resolution - Distance - Panel quality/size
kllrnohj 12y ago
The human eye does not have a simple resolution like that, and yes it's VERY possible to notice PPI differences in the 300-600 dpi range, especially for certain forms of content. See: http://www.anandtech.com/show/7743/the-pixel-density-race-and-its-technical-merits http://www.anandtech.com/show/7743/the-pixel-density-race-an...
- mitchty 12y ago
  At what distance though, without that your statement isn't helpful. We all know the human doesn't have resolution like a screen but if we ignore the optics of our eyes I think thats pointless. There are people saying they use their phones 6" away from their face. Ok, but that is not at all how anyone I know uses their phones at least distance wise. My example of tv screen and resolution is geared more to this: http://carltonbale.com/1080p-does-matter/ http://carltonbale.com/1080p-does-matter/ Take an 80" 4k tv, you need to sit about 5 feet for an average human to see the difference. I'd like to see equivalents for phones and dpi/screen size and distance.
  - kllrnohj 12y ago
    Read the link I posted, it explains it all. Also 20/20 is not only not perfect vision, it's not even average [1]. So using that as the baseline is stupid, it's the low end not the high end. Second the human eye does not have a fixed arc resolution, different specific detail scenarios have different degrees of accuracy. But if you're going to use this shortcut, you better go with a number on the upper end of things instead of the lower end, so more like .4 arcminute. The net result is there is real, technical merit in going all the way up to 600 PPI assuming it's held 12 inches away. There's still arguably value to be had beyond that, but it starts getting more into just being a pointless spec war. Right now, though, we are very firmly well inside technical worth. 1: http://precision-vision.com/Introduction-to-Visual-Acuity-Measurement/a-visualacuity.html#.VDQoTnWx3UY http://precision-vision.com/Introduction-to-Visual-Acuity-Me...
    - mitchty 12y ago
      I guess thats the key, I never really have my phone closer than 12 inches from my face. I still think we'd be better off with better batteries than trying to pack more pixels into a window.
pilsetnieks 12y ago
> I've had people tell me they could tell the difference between 720p and 1080p at 20 feet. That is physically impossible for the human eye. Well that would depend on the device. If it's a 5" phone, then yes, obviously. If it's a 21" display, also, yes. If it's a 75" TV, probably not.

by mitchty 12y ago

personZ 12y ago

Most people don't watch their set from 20 feet away. And position is seldom static -- I tend to stand during football games, for instance, and move closer during intense plays or close-call replays. The same thing happens with smartphones, where people pull it in tight to look at fine detail, and a very high DPI allows you to do that with endless zooming/unzooming.

boyaka 12y ago

Screen size!!! TVs are getting bigger. The factors involved are: - PPI/resolution - Media quality/resolution - Distance - Panel quality/size

kllrnohj 12y ago

The human eye does not have a simple resolution like that, and yes it's VERY possible to notice PPI differences in the 300-600 dpi range, especially for certain forms of content. See: http://www.anandtech.com/show/7743/the-pixel-density-race-and-its-technical-merits http://www.anandtech.com/show/7743/the-pixel-density-race-an...

mitchty 12y ago
At what distance though, without that your statement isn't helpful. We all know the human doesn't have resolution like a screen but if we ignore the optics of our eyes I think thats pointless. There are people saying they use their phones 6" away from their face. Ok, but that is not at all how anyone I know uses their phones at least distance wise. My example of tv screen and resolution is geared more to this: http://carltonbale.com/1080p-does-matter/ http://carltonbale.com/1080p-does-matter/ Take an 80" 4k tv, you need to sit about 5 feet for an average human to see the difference. I'd like to see equivalents for phones and dpi/screen size and distance.
- kllrnohj 12y ago
  Read the link I posted, it explains it all. Also 20/20 is not only not perfect vision, it's not even average [1]. So using that as the baseline is stupid, it's the low end not the high end. Second the human eye does not have a fixed arc resolution, different specific detail scenarios have different degrees of accuracy. But if you're going to use this shortcut, you better go with a number on the upper end of things instead of the lower end, so more like .4 arcminute. The net result is there is real, technical merit in going all the way up to 600 PPI assuming it's held 12 inches away. There's still arguably value to be had beyond that, but it starts getting more into just being a pointless spec war. Right now, though, we are very firmly well inside technical worth. 1: http://precision-vision.com/Introduction-to-Visual-Acuity-Measurement/a-visualacuity.html#.VDQoTnWx3UY http://precision-vision.com/Introduction-to-Visual-Acuity-Me...
  - mitchty 12y ago
    I guess thats the key, I never really have my phone closer than 12 inches from my face. I still think we'd be better off with better batteries than trying to pack more pixels into a window.

pilsetnieks 12y ago

> I've had people tell me they could tell the difference between 720p and 1080p at 20 feet. That is physically impossible for the human eye. Well that would depend on the device. If it's a 5" phone, then yes, obviously. If it's a 21" display, also, yes. If it's a 75" TV, probably not.