"Kenneth" <kdw### [at] earthlinknet> wrote in message
news:web.437641f51f234627b3cb5aca0@news.povray.org
> Patrick Elliott <sha### [at] hotmailcom> wrote:
>
>>> What people are
>> screwing up is that they are setting the gamma to something that
>> has *nothing* to do with their displays actual gamma, so when they
>> load it one something else, it looks wrong. In the case of
>> programs that correctly handle the setting in the file, *they* are
>> assuming the 'real' gamma is different that your monitor and are
>> dropping or increasing the image colors to 'match' what they
>> 'think' your display uses, which is by default 1.0, not 2.2.
>> --
>
> I have to admit that I didn't know monitors (all of them?) have a
> default gamma of 1.

They don't.  Most PC monitors (the ones I've measured) have a gamma of 
almost exactly 2.2.  This means, if you tell it to display RGB 128,128,128 
and measure the brightness, it will be 0.5^(2.2)=0.2 of the brightness of 
RGB 255,255,255.

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