Re: When neutral 50% gray isn't 50%: elementary gamma question
From: Chris Cox (ccox_at_mindspring.com)
Date: Sun, 10 Oct 2004 23:59:39 GMT
In article <email@example.com>, Marco Al
> 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 :
Other than the fact that they're all correct?
> > (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 :
Because Timo's site is a well known misinformation web site - the
images are designed to lie.