How to avoid burned out colors with sun & sky ?

[bernhard]

Hello friends !

Today I've made more tests with the sun & sky system.
And I could see, that I always get some objects with "burned-out" colors.

Here is a simply test, showing this issue:


What would you suggest to avoid similar "burned-out colors" like you can see on the white teapot in the front ?

I've tried to lower the value from the sun - but if I continue lowering the value, I will loose my hard shadow from the sun.

@size multiplier:
I've also tried to increase the sun size multiplier - but it has much more effect on the shadows - they get softer with a higher amount.

@turbity:
I've increased the turbidity to 20, and o.k. the "burned-out color" is better, but I've lost my clear look, and the whole image looks a little bit pale.

@photon emit radius:
Well, I think this point, is the most unknown point, or value for me.
It doesn't matter which value I use, the render looks always the same....


Thank you for every little help, suggestions & comments,
bernhard

[glorybound]

Burned color

Are you using any kind of coor correction or the .255 method?

[Paul Oblomov]

Try reinhard color mapping and lower the burn value. I think the easiest way.

[pengo]

I agree with Paul Oblomov
and remember reinhard with burn 0.0 is equal to exponential and burn to 1 equal to linear


bye

[DaForce]

I agree with Paul Oblomov
and remember reinhard with burn 0.0 is equal to exponential and burn to 1 equal to linear


bye

Sorry have to correct you there, burn 0.0 is not exponential, its similar but not the same. However burn 1.0 is exactly linear.

[pengo]

I have to agree with u to daforce about reinhard to 0 and similitudes with exponential color mapping
anyway better value I found are around 0.25 and 0.4
anyway depends on scenes

[dominiquelaksmana]

in my opinion, maybe it's not the sun's fault that cause this result. please check your color "saturation" value, i think it's 255...

well, this is my result of using color at 255 saturation value :

Shot at 2007-06-26

and this using lower than 255 saturation value.

Shot at 2007-06-26

if it's still looks burned, well, reduce the saturation some more,
that's my "way around".

best regards,

[ene.xis]

240 is my pick for white surfaces...but yeah definitely tune it accordingly to each situation
also checking out lele s videos, if u havent allready is a must!

[crazy homeless guy]

you didn't mention if you were using a physical camera. perhaps your exposure settings are out of whack, and that is why your whites are blowing out.

[bernhard]

testing

Hello friends and thank you for all your feedback.

Here are some more tests.



and as you can see, the image get's a kind of pale look...









@crazy homeless guy:
I've used a standard and vray physical camera, and it's the same.
I've tried to match the physical cam with the standard cam, I think the shutter speed at 1 is close to the standard cam, ISO 100.

@ene.xis, @dominiquelaksmana:
I've lowered the saturation, but you can see the problem. Lowerin the saturation will bring the issue to loose the color information - white, isn't really white anymore, it's getting grey.

@DaForce @Paul Oblomov:
Well, just using Reinhard, and lowering the burn value will bring me the problem with loosing my color information - white is getting grey.


I know this isn't really an easy theme, but I have always this issue with burned out colors.... maybe I can get enough information to test different ways.... I really appreciate every little help.

bernhard

[Shimakaze]

The idea with the physical cam is to expose the scene to fit the brightness of the sun and not the other way around.
Try this:
Reset everything to default values. Set the vray sun to defaults and don't turn down the multiplier.
use a physical cam set to something like ISO 100, F-Number 8 and Shutter speed 250.
Depending on if you use linear workflow those settings might be too bright. if so increase shutter speed to 500, ISO to 50 or F-Number to something like 11.
All those settings have the same effect on the brightness of the scene. which one to alter depends on what other effects you want. (depth focus vs motion blur)
It's best to do this with the .255 rule either way though.
edit: oh and make sure you have the exposure checkbox checked in the phys cam settings or none of the settings will do anything.

[alexthg]

as someone suggested earlier, you might want to try Lele's method:
http://www.chaosgroup.com/forum/phpB...ic.php?t=17824

or, try the noob way (like I recently do) : set the vraysky to manual node, and put different intensity multiplier on vraysky and vraysun. Usually I set the vraysun intensity lower than the vraysky. Just lower the sun multiplier till the burned-out got a bit under control... and use it in combo with reinhard

[travistlo]

Also, didnt vlado say that the Sky renders 2x daker than it should?
I separate my sky for the GI and the Background.
I have 1 sky in manual mode linked to the sun but the intensity is 2x for the background.
The other is in the Enviroment overide for the GI. That one is normal non manual mode.

I dont know if its right, but it make the sky not so dark, and you still get the nice gradiants, and is linked to the sun.