Re: When neutral 50% gray isn't 50%: elementary gamma question
From: Marco Al (m.f.al_at_student.utwente.nl)
Date: Thu, 07 Oct 2004 05:21:12 +0200
Graham Jones wrote:
> I'll try one more time. Let's say the 'native' gamma of a monitor is
> 2.5, meaning (luminance out) is proportional to (voltage in)^2.5. When
> people talk about gamma=2.2 for PC monitors they mean that a small
> correction is applied to make the monitor behave like (pixel value)^2.2.
No the problem is noone agrees with eachother :)
Find the common denominator between these :
> (sensation out) = (luminance in)^(1/1.8).
Perception of differences in luminance is approximately logarithmic, so
it should cancel out against gamma. Some of the images at the following
page tell a different tale though :