Am 12.09.2011 09:10, schrieb Thomas de Groot:
> On 11-9-2011 23:44, Alain wrote:
>>
>> You can use: pigment{srgb<213, 127, 79>/255}
>
> Yes, but that gives a totally different color. As I asked elsewhere here
> in answer to Jaime: I am unsure when you need to use the terms 'rgb'
> (which seems to be almost always) or the term 'srgb'in POV-Ray code.
>

<sigh> you *use* 'srgb' when the color value you specify *is* in sRGB 
color space. E.g. when taken from some color picker, translated from 
HTML colors or you simply prefer to "think" of colors as sRGB colors.

And (as it was not yet mentioned within this thread), changing the gamma 
(using gamma correction for brightness adjustment on a per color or 
whole scene basis) or using 'wrong' gamma (rgb versus srgb) does NOT 
ONLY change the brightness, it also changes the hue.

And (more or less unrelated and not meant do add more confusion) 
personally I do avoid sRGB like hell simply because I'm meanwhile used 
to the AdobeRGB color primaries and one nice thing about POV-Ray is 
because it has no defined inbuilt color space (with some exceptions) 
this works like a charm.
And yes, I own a monitor that is actually calibrated for AdobeRGB and 
yes, this makes a difference. But I do convert my final images to sRGB 
when I show them somewhere in the web.
But when it comes to questions about color spaces things get indeed a 
bit complicated while I still think the gamma issue is trivial and the 
whole reason for confusion there is the huge amount of half-true 
information that is spread around.

-Ive

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