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Re: Display on a 12bit monochrome monitor

Posted by Gluender-3 on Jan 26, 2010; 12:51pm
URL: http://imagej.273.s1.nabble.com/Display-on-a-12bit-monochrome-monitor-tp3689586p3689589.html

Hello,

it appears as if you're approaching the facts...

>Even if it isn't strictly subject related
>
>Sure that human vision can distinguish more than 8 bit grayscale images!!!.
>That what human vision can't do is to distinguish more than 128/256 gray
>levels simultaneously (i.e. brain has much more narrower dynamic range that
>eyes who must adapt them to the average luminance of the field of view).

According to the classic measurements of Steinhardt (1936), humans
show a threshold for light density (luminance) discrimination (just
noticeable difference) of at best 1% (Weber fraction).
"At best" here implies a mean density of around 10^4 Troland and a
test area of larger than 25 degrees of visual angle.
For test fields of 0.5 degrees of visual angle the Weber fraction
approaches 10%.

With respect to the earlier post of Marcel:

"Print products (e.g. the good old analogue BW photography paper) do have a
lot wider gray scale ranges than monitors and you are able to see that."

...I should like to add that in principle b&w-photographic material
shows essentially a binary behaviour at least on the microscopic
level. (Facts to think about...)

Best
--

                   Herbie

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