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Probably that cursed assumed_gamma 1.0 thing. ;-)
P.S.
Great renders.
bob h
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They *are* nice aren't they? It took me a few seconds to figure out what
the weird glowy bit was. Must be tired.
I was thinking "gamma problem" too.
--
signature{
"Grey Knight" contact{ email "gre### [at] yahoo com" }
site_of_week{ url "http://digilander.iol.it/jrgpov" }
}
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Grey Knight wrote:
>
> I was thinking "gamma problem" too.
The real problem is mismatched contrast ranges. The standard way of
lighting CG produces low contrast scenes and using radiosity amplifies
the effect because it's trying to simulate reality with wrong input
data. One way to deal with it is to use gamma as contrast control:
assumed_gamma 1+(Display_Gamma-1)*Contrast, 0 < Contrast < 1
Some scenes just are low contrast by nature and require transfer curve
editing. Then you dig up the curve editor and twist away until the image
looks right, or hope the automagic adjustment does a good job.
_____________
Kari Kivisalo
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Andrew Cocker <mai### [at] mariner9fsnetcouk> wrote in message
news:3c57c561@news.povray.org...
> Hi,
>
> It's been a long while since I posted anything, but as I very recently
> FINALLY got a new pc (1Ghz Athlon, 256 Meg DDR etc), I'm POV-ing again.
>
> This piece was inspired by a BRAZIL render - maybe some of you have seen it.
> If so, you'll be able to see that mine comes nowhere near the
> photorealistism of that work. Mine is definitely a WIP. I don't like the
> textures, nor can I even approach the contrast from dark to light of the
> BRAZIL render (even though that artist mentions using post-processing, I
> still feel that my render could be improved. Maybe using radiosity was a bad
> idea.)
>
> Anyway, any comments would be welcome.
>
> All the best,
>
> Andy Cocker
>
>
>
Is it just me? Or do your bolts have 8 sides instead of 6?
Is that a locale thing?
--
Tom Bates
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"Tom Bates" <tho### [at] shawca> wrote in message
news:3c59862e@news.povray.org...
> Is it just me? Or do your bolts have 8 sides instead of 6?
> Is that a locale thing?
Oops.. well I just used a height_field made from one of PSP's inbuilt
shapes, and it never dawned on me that it should have just 6 sides. Ah well.
All the best,
Andy Cocker
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I hardly notice any significant difference between both contrasted images.
But I strongly agree that both improves the image a lot.
Fernando.
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> I agree. What kind of control do you have over that feature in Photoshop?
> PSP's control lets you control the bias, strength, and appearance but only
> as a few simple radio button options.
Well the "autocontrast" feature doesn't allow you any control. But you can
get the same result with very very detailed controls by playing around with
the levels controls. But for the most part autocontrast gets good results.
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You can also get some very nice results with a great deal of control by
playing around with the curves editor in photoshop.
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Attachments:
Download 'BoltsCurve2.jpg' (12 KB)
Download 'BoltsCurve1.jpg' (11 KB)
Preview of image 'BoltsCurve2.jpg'
Preview of image 'BoltsCurve1.jpg'
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http://www.pp.htv.fi/kkivisal/bolts.jpg
_____________
Kari Kivisalo
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Neat did you play with the individual colour channels to get this effect?
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