[opendtv] Re: CBS Color without a wheel

  • From: Olivier Houot <olho_avatar_i@xxxxxxxxx>
  • To: opendtv@xxxxxxxxxxxxx
  • Date: Mon, 12 Dec 2011 23:40:22 +0100

> Gamma is not a measure of contrast; it is simply a measure of the 
> transfer characteristic -- and, even then, only theoretical.  Few 
> video/vision controllers ever restricted themselves to the
> theoretical 
> gamma.


Gamma correction is used to adapt to the non linear response of the
human eye. By choosing different curves, it will make a difference on
the final ability of the observer to distinguish between two given light
levels. 

If a different exponent allows to differentiate between two light levels
that would have been visually too close using the other correction
curve, wouldn't you say that it amount to a greater perceived contrast,
even if is only perceptual, and not directly related to the physical
one?

I am afraid i do not have access to ieee documents. However i've liked
the video; Didn't know you were visible on youtube, nice to see you :-)

Thanks to Cliff for an always interesting historical document.

 
 
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