High Dynamic Range Images.

Well, a funny coincidence. Some time ago I have started to create my
own patch for POV that does work with the SGI LogLuv Tif-format.
After having mentioned that it would be a very good thing if POV would
support high dynamic range images a few times in the pov-ng's (in hope
that anyone else will do a patch) I finally decided to do this by myself.
Main differences to the HDR-patch in mlpov are: support for HDR
*output* in TIFF LogLuv format or full blown floating point TIFF
(96 bit/pixel). Import for Radiance (the same as done by Mael) and
LogLuv images as image maps. Exposure and gain control in the way Kari
Kivisalo did suggest.
This is one of the numerous test images I have done so far and meanwhile
I'm really bored in using the uffizi, grace, campus and beach probes so for
the next time I will try to create the light probe image itself with POV in the
HDR format and use it later for global illumination.

so long and happy everything
-Ive

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Attachments:
Download 'uffizi.jpg' (33 KB)

Preview of image 'uffizi.jpg'

Can we see some more images?

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> Main differences to the HDR-patch in mlpov are: support for HDR
> *output* in TIFF LogLuv format or full blown floating point TIFF
> (96 bit/pixel). Import for Radiance (the same as done by Mael) and
> LogLuv images as image maps.

great, those are exactly the two things i thought was missing to my patch :)

> I'm really bored in using the uffizi, grace, campus and beach probes so
for
> the next time I will try to create the light probe image itself with POV
in the
> HDR format and use it later for global illumination.

i ve not tried them but it seems there are more hdr images here
http://www.akuratny.com/hdri.htm

you can also try to build your own environment if you have a chrome ball,
and a cool digital camera, with hdrshop (http://www.debevec.org/HDRShop/)

M

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"Apache" <apa### [at] yahoocom> schrieb im Newsbeitrag
news:3e0996ef$1@news.povray.org...
> Can we see some more images?
>
As you can see, Gilles has done some HDRI tests, the most things I  have done
are simple boring spheres, only to test if the implementation works correct. I'm
still not sure if my function for HDR images interpolation method 2 works as it
should and I have also to invetsigate a little more about floating point formats on
various platforms to make sure the HDR floating format tiff output works correct.

-Ive

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> great, those are exactly the two things i thought was missing to my patch :)
>
Well, in fact if I had earlier known that you have already implemented that
in MagaPov I would simply have sended emails to you, until you where
convinced also to support the output in the HDR format :-)

> i ve not tried them but it seems there are more hdr images here
> http://www.akuratny.com/hdri.htm
Thanks for the link, I will look at them.

> you can also try to build your own environment if you have a chrome ball,
> and a cool digital camera, with hdrshop (http://www.debevec.org/HDRShop/)
Yeah. But this is one of the reasons for implementin also the HDR output. POV
can easily render that "chrome ball" and this way any kind of pov-scene can be
used e.g. as a global lighting map (and I do not own a cool digi cam, in fact I do
not own any digi cam).

-Ive

P.S. sorry for the mail, wrong button in outlook.

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> This is one of the numerous test images I have done so far and meanwhile
> I'm really bored in using the uffizi, grace, campus and beach probes so
for
> the next time I will try to create the light probe image itself with POV
in the
> HDR format and use it later for global illumination.
>
Your image looks very realistic.
 I read that you can create HDRI output from Terragen with SOPack.
Terragen is a landscape renderer (like Bryce) and I would say, it creates
very realistic looking scenes.

Sven

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