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Source in bin.source
Not to my surprise MP produced good images when supplied with physically
correct data. Sun color temp. 5400K. Sky color temp. 15000K to 18000K.
Sun/sky energy ratio 9 for clear sky. Notice the gamma 1.0 again.
Image white point 6500K, gamma 2.2.
Because pov doesn't support compression of dynamic range I used slightly
lower diffuse values to prevent burning.
_______________________________________________________________________
Kari Kivisalo www.kivisalo.net
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Attachments:
Download 'energy.jpg' (46 KB)
Download 'energy2.jpg' (57 KB)
Preview of image 'energy.jpg'
Preview of image 'energy2.jpg'
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Kari Kivisalo wrote:
> Not to my surprise MP produced good images when supplied with physically
> correct data. Sun color temp. 5400K. Sky color temp. 15000K to 18000K.
> Sun/sky energy ratio 9 for clear sky. Notice the gamma 1.0 again.
> Image white point 6500K, gamma 2.2.
Yup, all sounds about right, looks fine.
Ugh, this is the problem with amateur computer graphics, all these gammas and
color temps and everyone's monitor looks different! By amateur I don't mean
lower quality, but lacking professional equipment.
BTW my display is set around 9000k for pure white I guesstimate...
Temp R G B
9300 83 83 72
Mine 85 82 72
6500 91 79 61
5000 100 77 49
--
David Fontaine <dav### [at] faricy net> ICQ 55354965
Please visit my website: http://davidf.faricy.net/
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I have my monitor set to 6500K
David Fontaine wrote:
> Kari Kivisalo wrote:
>
> > Not to my surprise MP produced good images when supplied with physically
> > correct data. Sun color temp. 5400K. Sky color temp. 15000K to 18000K.
> > Sun/sky energy ratio 9 for clear sky. Notice the gamma 1.0 again.
> > Image white point 6500K, gamma 2.2.
>
> Yup, all sounds about right, looks fine.
> Ugh, this is the problem with amateur computer graphics, all these gammas and
> color temps and everyone's monitor looks different! By amateur I don't mean
> lower quality, but lacking professional equipment.
> BTW my display is set around 9000k for pure white I guesstimate...
> Temp R G B
> 9300 83 83 72
> Mine 85 82 72
> 6500 91 79 61
> 5000 100 77 49
>
> --
> David Fontaine <dav### [at] faricynet> ICQ 55354965
> Please visit my website: http://davidf.faricy.net/
Post a reply to this message
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> BTW my display is set around 9000k for pure white I guesstimate...
Mine's at 10000k, with R, G and B at 100. Is that good? (Yes, my monitor can
light my entire room quite well.)
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Kari Kivisalo wrote:
>
> Source in bin.source
Could you please post rbox.inc ? I wanted to try something with
your source but couldn't run it without the include file.
Thanks,
--
Ken Tyler
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My monitor doesn't have any way of setting the color temperature. Is there
some way of finding out what the color temperature is?
Mark
Post a reply to this message
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Kari Kivisalo wrote:
>
> Source in bin.source
>
> Not to my surprise MP produced good images when supplied with physically
> correct data. Sun color temp. 5400K. Sky color temp. 15000K to 18000K.
> Sun/sky energy ratio 9 for clear sky. Notice the gamma 1.0 again.
> Image white point 6500K, gamma 2.2.
>
> Because pov doesn't support compression of dynamic range I used slightly
> lower diffuse values to prevent burning.
>
looks quite good but it is a bit simplified. If there is *no* dust in the
atmosphere, the color of the sky depends on the angle to the sun. In fact there
is alway some dust and therefore the sky's color (temperature) is a function of
the angle to the sun and horizon. Furthermore the sun's own color is also
influenced by dust.
Christoph
--
Christoph Hormann <chr### [at] gmxde>
Homepage: http://www.schunter.etc.tu-bs.de/~chris/
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6500K is typically thought of as being pure white. 'Whiteness' is a subjective
thing, but since we began our existance in the wild and are diurnal by nature,
the color of the sky combined with the color of the sun at noon with an
unobstructed view of the sky would make a good basis for our perception for white
- which happens to be around 6500K.
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Mark Wagner wrote:
>My monitor doesn't have any way of setting the color temperature. Is
>there some way of finding out what the color temperature is?
>
You can measure it. A professional photographer who does colour work may
have the right equipment.
Ingo
--
Photography: http://members.home.nl/ingoogni/
Pov-Ray : http://members.home.nl/seed7/
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Ken wrote:
>
> Could you please post rbox.inc ?
It's just a rounded box macro. My sources and net connection
are currently physically separated so try this:
box{-0.5,0.5 scale<bw,bh,bw> translate bh/2*y}
box{-0.5,0.5 scale<bw,bh,bw> translate (ht-bh/2)*y}
_______________________________________________________________________
Kari Kivisalo http://www.kivisalo.net
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