Digital BW, The Print

It's my understanding that gamma 2.2 and 1.8 are vestiges of the CRT.

See this URL for an interesting commentary on the history and  
mathematics...
http://www.poynton.com/GammaFAQ.html

Regarding the non-linearity of human vision, key places this is  
accounted for are the image capture/development processes.  S curve  
of film or the TRC (tone response curve) of raw conversion.

Scott King
Austin, Texas

On Nov 21, 2005, at 10:14 PM, Paul Roark wrote:

> I wanted to clarify something I posted earlier:
>
>> In its Color Settings layout, Adobe PS Elements groups sRGB with  
>> GG 2.2;
>> AdobeRGB is associated with Dot Gain 20%.
>
> The grouping of Adobe RGB with Dot Gain 20% is apparently done  
> because those
> are the settings used commonly by the prepress industry, not  
> because Adobe
> RGB uses Dot Gain 20%.
>
> Both Adobe RGB and sRGB use a gamma of 2.2 because it is felt to more
> closely approximate the human visual response.
> See http://visual-vacations.com/ColorManagement/cm_101/01intro.htm ,
> http://www.microsoft.com/whdc/device/display/color/sRGB.mspx ,
> http://www.adobe.com/digitalimag/pdfs/AdobeRGB1998.pdf
>
>
> Paul
> www.PaulRoark.com
>
>
>
>
>
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