"gonzo" <rgo### [at] lansetcom> wrote in message
news:web.437683731f2346275e2aed360@news.povray.org
> "scott" <spa### [at] spamcom> wrote:
>
>> 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.
>
> Except... (there's always those damn exceptions!) it can't be
> strictly a matter of your monitor, because I have a dual boot PC
> with Linux & Windows, yet I cannot get the two to agree on
> display_gamma, even though its the same hardware. With both set the
> same, what looks good in Linux will be too dark in Windows.

Of course, to be able to send 128,128,128 to your monitor your display 
driver and image software must not interfere with the gamma of a displayed 
image.  I would check the display driver settings in both OSs to ensure the 
gamma correction is set to 1.0.

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