Can eyes our decipher the difference between a 1080p and a 720p resolution??

Question

discarding the distance and lighting. i just want the concrete answer. i mean whats the maximum resolution our eyes can actually "see".

Answer 1

720p and 1080i are very close as far as what our eyes can perceive.

1080p is perceived as higher resolution than 720p.

The max resolution our eyes can see is about 6 mega-pixels. This is 3000 by 2000 pixels on a 6"x4" print, when viewed at a distance of about 18 inches. This can be calculated by knowing the Cone Density in the Fovea, which is in the center of the Macula, in the Retina.

Now, if we take into consideration that the the Eyes scan back and forth, the Eye-Brain combination lead to an end result of about 20 mega-pixels.

Answer 2

It depends on the size of the TV.

You don't have very many 4" HD screens because at that defination the difference between 1080 picxels and 720 picxels per square inch would be impossible to see.  When you increase the TV beyond 27" then you start to notice the difference.  A 720 dpi (dots per inch) would look fuzzy since you would almost make out the individiual dots.

Monet painted using a system of dots similar to modern pixels.  If you look closely at one of his paintings all you will see will be a series of dots.  You have to stand back to see the actual image.  In the same way you need to have a smaller screen or stand back much further to see a lower dpi screen clearly.  A higher dpi screen allows you to have a larger TV screen and still sit up close to it making it closer to the image you would get in a theater.

  

According to Wikipedia:  

"A maximum resolution of the human eye in good light of 1.6 minute of arc per line pair will correspond to 1.25 lines per minute of arc. Assuming two pixels per line pair (one pixel per line) and a square field of 120 degrees, this would be equivalent to approximately 120×60×1.25 = 9000 pixels in each of the X and Y dimensions, or about 81 megapixels."