Re: Luminance - Illuminance

Gerhard Fuernkranz avait énoncé : 
Paco Rosso schrieb:

Gerhard Fuernkranz avait énoncé :

Paco Rosso schrieb:

There is some issues about the preceived lightness and distance. it is supose that when the angle of vision of the point is less than 1 minute of arc the lightness works as intensity, and for greater angles it works as lightness.


Indeed, the human vision has a limited spatial resolution, however I guess, Gernot did not intend a viewing distance as large as a mile for his monitor ;-)

Regards,
Gerhard


But a normal distance the screen do not cover the whole visual field.
At least with the common human screen :-P
...

Paco, sure, but how is this related to your initial message above, where you did not talk about covering the visual field, but where you talked about SMALL angles "less than 1 minute of arc"?

When I responded to your message, I did not have in mind to cover the whole visual field (this would require a SMALL distance), but I was actually thinking of a LARGE viewing distance, such that the screen width becomes as small as 1 minute of arc, and for a common screen size, this would require a viewing distance of more than 1 mile :-)

    0.5m / (1/60*pi/180) = 1718.9m

Regards,
Gerhard


Gerhard, I was joking...

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Francisco Bernal Rosso
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