This found its way into my inbox. Friends of mine know I've been wanting to launch a personal site for a while, and have been sending me all kinds of articles related to the purpose. So I'm hoping that on a webmaster forum, others might benefit from this knowledge, or at least enjoy reading it:


Your Eye's "megapixel" Resolution

~huGoFdeStruction reports, 1d 22h ago

The average human retina has five million cone receptors on it. Since the cones are responsible for colour vision, you might suppose that this equates to a five megapixel equivilant for the human eye.

But there are also a hundred million rods that detect monochrome contrast, which plays an important role in the sharpness of the image you see. And even this 105MP is an underestimate because the eye is not a still camera.

You have two eyes (no kidding!) and they continually flick around to cover a much larger area than your field of view and the composite image is assembled in the brain - not unlike stitching together a panoramic photo. In good light, you can distinguish two fine lines if they are seperate by at least 0.6 arc-minutes (0.01.Degrees).

This gives an equivilant pixel size of 0.3 arc-minutes. If you take a conservative 120 degrees as your horizontal field of view and 60 degrees in the vertical plane, this translates to ...

576 megapixels of available image data.

Curiously - as a counterpoint to this - most people cannot distinguish the difference in quality between a 300dpi and a 150dpi photo when printed at 6x4", when viewed at normal viewing distances.

So: although the human eye and brain when combined can resolve massive amounts of data, for imaging purposes, 150dpi output is more than enough to provide adequate data for us to accept the result as photographic quality.

But don't forget that women have more cones and men have more rods - I kid you not.Therefore the ladies see colours brighter than gents but can't see as well when it gets dark.









Found this somewhere in the net.
Hope you like it :]

576 mega pixels. how much would that camera cost?

576MP would make an impressive camera. To know that we have two of those coupled in such a way to give 3D video is amazing!

Joking aside; I once asked myself that question, thank you Learning Newbie for the technical and mathematical answer.

Learning Newbie, I think you forgt two points:

*Our eyes have continuous focusing and continuous iris adjustments.

* The reason we have 2 eyes is for 3D vision. The distance between both eyes is on avarage 6 cm. If you sit down and look at something with one eye and close the other, you will see a different image than when you open the closed eye and close the open one, this difference is due to the 6cm distance between them.
With this 6cm difference in mind, the brain calculated the third dimension, depth.