"Gilles Tran" <tra### [at] inapginrafr> wrote in message
news:421616f4@news.povray.org...

> news:42161482@news.povray.org...
>
> > To understand the difference between local and global contrast better,
> load your
> > image up in a graphics package like Photoshop or similar that supports a
> live
> > Histogram view.
>
> Do you think that you could edit this a little bit and add it to the wikipov
> site ? The fact is that *** many *** POV-Ray pictures suffer from contrast
> issues and that this little tutorial you just wrote could be very handy.
> It could go there:
> http://www.wikipov.org/ow.asp?ArtTips

I've never posted to a wiki before so if you could explain what I have to do
(and what I shouldn't do) I'll edit something together and put it online :)

Lance.

thezone - thezone.firewave.com.au
thehandle - www.thehandle.com

Lance Birch wrote:

...

Thanks for taking the time. A beautiful succinct discussion. I really 
appreciate it. I did understand some things about local vs global 
contrasts though not by those terms.  I would have termed the 
adjustments we make in "real world" perception, that you credit to the 
eyes, "haptic" perception, and viewed it as an extension of our 
"embodied" consciousness.*  So generally I think that the eyes adjust to 
optimise a view of what the mind-body already knows is there.  So when I 
painted I tended to incorporate those adjustments but never thought of 
it as "fill light" but rather as "haptic" knowledge. If fact for years I 
painted very, very dark, close-toned paintings, where I would use tricks 
of paint handling to make objects more or less distinct.** I'm a big 
admirer of Whistler and Rosseau, in addition to Morandi. So your 
discussion helps simplify things tremendously and helps me think in 
terms of digital methods and empirical light gathering. (And I didn't 
know at all about the PS Unsharp Mask.  Really anxious to explore that.)

Thanks again.  You really helped me simplify my thinking about this.  I 
almost mentioned in my previous post, that I think one of my big 
problems with lighting is that I don't have strong sense of what looks 
correct.  I tend to accept what the raytracer gives me like I accept 
what the camera gives me and am reconciled to the idea that neither is 
going to look like what an embodied experience of the same scene would 
be anyway.  There is so damned much to learn!

In general I might have subconsciously understood the issue but I was 
mired in the idea that there might be a somehow "honest" way of 
achieving the result, say, if I just understood Jaime's lighting system 
better.  I've to laugh at this because I have also felt that *I* was one 
of the foremost proponents of raytracing is an medium rooted in artifice.

-Jim


*Merleau-Ponty reigned when I was in college.

** You might appreciate that this took me to truly obsessive lenghts 
when it came to trying to document my paintings photographically for my 
portfolio.

news:42162096$1@news.povray.org...
> I've never posted to a wiki before so if you could explain what I have to
do
> (and what I shouldn't do) I'll edit something together and put it online
:)

It's very easy: go to the main page http://www.wikipov.org/ and then to the
sandbox. Click on "Edit this page" (you'll have to log-in with the password
given on the front page) so that you can familarise quickly with the syntax.
After that go to add/modify what you want. The ArtTips page is probably the
best place to put a link to (and then create) your tutorial page.

G.

-- 

**********************
http://www.oyonale.com
**********************
- Graphic experiments
- POV-Ray and Poser computer images
- Posters

Ross wrote:
> I just have to say that some aspects of your scene are mind boggling
> realistic. The water bottle looks totally real. The clock and the spices on
> top of the over... real. The drapes over the window, and the tiles are
> perfect.

   Thanks!

> really, the water bottle, even if just a mundane everyday object, stands out
> as being utterly real. fantastic work.

   Yes, it come out really good, perhaps because it is a double mesh 
"intruded" with Wings3D (the material is just Glass4, IIRC). But note 
how I carefully placed the orange to hide the ugly bottom part... :)

--
Jaime

Well, I just downloaded HDR Shop and upgraded my version of Poseray.
This HDRI stuff looked very challenging and time consuming when I was 
working on the contest entry. Now I have time to explore what it can do
for the next contest. 
Stay tuned :)

Chris Holtorf

"Chris Holtorf" <lho### [at] nwlinkcom> wrote in message 
news:1103_1108777138@news.povray.org...
> Well, I just downloaded HDR Shop and upgraded my version of Poseray.
> This HDRI stuff looked very challenging and time consuming when I was
> working on the contest entry. Now I have time to explore what it can do
> for the next contest.
> Stay tuned :)
>

The quick and easy method would be to simply download MegaPov 1.1, and then 
get the ready-made kitchen probe, 
http://www.debevec.org/Probes/kitchen_probe.hdr   That's neither challenging 
nor time-consuming; just the way I like things!  :-)

However, getting radiosity to look good in an HDRI scene can be challenging, 
in my experience.  But it's generally necessary in a picture in which you're 
likely to have recessed areas.

-- 
Jeremy
www.beantoad.com