What resolution can human eyes achieve in terms of 'dot per inch'? thanks.?

Question

Can our eyes tell the differences between two exactly same pics (prints) with different resolutions, say, 4 x 6 @ 300ppi and 4 x 6 @ 100 ppi (pixel per inch)?

Answer 1

Yes, you can see the difference between 100 ppi and 300 ppi in 4x6's. Most inkjet printers need 200 to 300 ppi to make a clear print (depending on manufacturer/age of the printer). At higher than 300 ppi, differences usually cannot be seen except in big enlargements.

When looking at a printed photo, our eyes can only distinguish differences at about 300 dots per inch. That's why inkjet photos can look so clear, even when the photos don't look very good under a microscope.

This may be different than the total resolution that is possible in sight. The eye/brain combination is better than any camera!

Answer 2

Yes, actually you can tell them apart between 300 dpi and 100 dpi. Look for any edges of the picture. You can see a smoother edges in 300 dpi picture whereas rougher or jagged edges in 100 dpi picture. Does it help?

Answer 3

I am a librarian with an acquaintance in the digital camera business as a consultant. His website is at http://www.dci3.com/ You might check his site out. Trying to be helpful, not to spam--I've seen this gentleman give presentations about digital cameras and he knows what he's talking about. Take care.

Answer 4

32 million