3D3D5F02.BB235644@gmx.de...
> You probably mean what's called 'Tonwertkorrektur' in german PS.  It
> specifies which colors in the original image are supposed to be white,
> black and 50% gray in the result.  I'm not yet sure how this is handled
> internally, but it surely would be an interesting function.

In fact Picture Publisher and the Gimp have it too (so I suppose that the
code is available). It's the function I use most for color correction, as it
is very fast and flexible and gives the user a lot of control (there's also
an "automatic" mode).

G.


--

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

> --
> POV-Ray tutorials, IsoWood include,
> TransSkin and more: http://www.tu-bs.de/~y0013390/
> Last updated 15 Jul. 2002 _____./\/^>_*_<^\/\.______

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Gilles Tran wrote:
> 
> [...]
> 
> In fact Picture Publisher and the Gimp have it too (so I suppose that the
> code is available). It's the function I use most for color correction, as it
> is very fast and flexible and gives the user a lot of control (there's also
> an "automatic" mode).

All right, i will have a look at the GIMP source (although it's really not
what i would call 'easy reading' ;-)).

Christoph

-- 
POV-Ray tutorials, IsoWood include,                 
TransSkin and more: http://www.tu-bs.de/~y0013390/  
Last updated 15 Jul. 2002 _____./\/^>_*_<^\/\.______

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Simply outstanding. Well beyond my humble comprehension of POV-Ray.

Gilles, you're probably the best POV'er of all times! Gotta love oyonale...

Salute!

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Another very interesting color correction variant has been added to
Photoshop 7. They call it Auto Color. Check out this video (Quicktime) to
see what it does. http://www.adobe.com/products/photoshop/movie_nf3.html

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That is the sound of my jaw dropping to the floor!

Wow and wow some more!

"Gilles Tran" <tra### [at] inapginrafr> wrote in message
news:3d3c72af@news.povray.org...
> Jpeg compression wasn't too kind on this one :( Well I'll put some
close-ups
> and details on my site sometimes in the next months.
>
> - Rendered with povray 3.5
> - Uses low quality radiosity (count 10 error_bound 1...)
> - Terragen sky
> - Terrain modelled with World Machine (beta)
> http://students.washington.edu/sschmitt/world/ (great prog, BTW)
> - Render time at 1200*1600 takes 6 hours and 600 MB of RAM (P4, 1.7Gz, 1Gb
> RAM)
> - 15000 plants with something like 20 different Xfrog models, all by me
> except the main tree, the small bushes and trees in the background, and
some
> grass. The "evil" tree is by me too. 2000 leaves and twigs in the pond.
> Possibly I'll make some of the plants available later this year.
> - The hardest part was to create the backlit leaves for the main tree. For
> this I had to make "fleshy" leaves and fill them with scattering media. I
> wish I could have done it on all the plants, but either I'll wait for
faster
> machines or find a better solution for backlit translucent material. Some
of
> the flowers were double_illuminated.
> - Dragonflies modelled in Rhino with the demo version (before I bought
it).
> They'll surely look better at the final full res of 6000*8000 which is
> rendering now.
> - The frog is a Poser one. It's almost invisible at 600*800 but it's
> there...
> - Regrets : the lighting. I had a lot of trouble with it, as the original
> image
> is not very gamma-tolerant : it looked ugly on low-gamma monitors and much
> too dark on others. I had to find a middle way so I tweaked the tones in
> post-process and some colors were lost (and there's some extra graininess
> too). I hope it looks right on your PC or Mac.
>
> G.
>
> --
>
> **********************
> http://www.oyonale.com
> **********************
> - Graphic experiments
> - POV-Ray and Poser computer images
> - Posters
>
>
>
>
>

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That is one stunning image. 

-- 
sphere{z*5,1pigment{rgb.5}finish{reflection.3specular.5}}box{<-50,-3,-50>
<50,-2,50>pigment{checker/*\__\\__/  * \_\\__*/scale 2}finish{ambient.7}}
light_source/*__\\__\\__\\__\\__\(    ~ )\__\\__\\__\\__\\*/{<2,5,1>*4,1} 
/*\\__\\__\\__\\__\\__\\__\\__\\__\~  -/__\\__\\__\\__\\__\\*//* Steve */

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AAAAaaaaaaaaarrrrrrgh "Humiliator" strikes again!
I was so much happier when I didn't know your works, Gilles.
No just kidding ;-)
BTW I had an idea for the IRTC dreaming round: a pond, a frog on the shore
looking a its image in the water, and the image was to be the prince
charming's one. But here I swear I can smell the perfume of your flowers.


3D3D12CC.5D0F2200@gmx.de...
> Also the waves here are quite high frequency, something also indicating
strong wind effect.

I don't agree on this point: wavelength depends of the *fetch* i.e. the
length on which the wind interacts with the water. the wavelength increases
with the fetch, so, on small ponds, you only have hi-frequency ripples.
With this surrounding you may have some turbulence caused by plants, some
area beeing exposed to breeze while others are sheltered.

Marc

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While I think this is a wonderful image, and it has many technical and
artistic merits, I hope you don't mind me saying that I think you may have
missed your mark by a little. Certainly it is better than I could have done,
but I think that in one area, an important one, you could have done better.

    The "evilness" of the tree was not apparent to me even on a second and
third look until I read the title.

    My eye is draw up by the black lines of the reflection, up the trunk of
the trees to the middle of the branches. Only on a second look did I see
that something was wrong with the reflection and then I spent a minute
wondering what you did wrong to make such distorted reflections. Only after
I decided that you could not have done that by accident did I re-read the
subject line and then look over your comments to see what you were trying to
do.

    I can't imagine how you could fix it, and it may not be broken enough to
worry about, but I thought you might like to know that although I like the
image in general, for me at least, the effect you seem to be trying for is
not as pronounced as it might be.

    The only things I can think of is to lose the small wind ripples that
make the reflection seem distorted (unfortunately, that would diminish the
realism of the water), and/or maybe "evilize" the reflected sky somewhat to
give more clues (but which also destroys the singular nature of the evil
tree). Both bad ideas really, but I hate to critizise without giving
suggestions.

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Very, very impressive. A wonderful piece of work yet again.

Kev.

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Bill DeWitt wrote:
>     The only things I can think of is [...]
> [...] and/or maybe "evilize" the reflected sky somewhat
> to give more clues (but which also destroys the singular nature of the
> evil tree). 

   I also had the same problems recognizing the "evil part", and my idea 
was the same. Is not that bad idea at all... why only the tree has to have 
an evil side? This idea in fact seems better to me: is the pond who has the 
power to show the evil side of everything it reflects.


-- 
Jaime Vives Piqueres

La Persistencia de la Ignorancia
http://www.ignorancia.org

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