I need advise on this image

[andstef]

Hello!

 

I'm working on illustrating an interior and would appreciate some advise from you.

This scene is lit by a V-ray sun and sky with default settings, the sun is almost perpendicular to the ground, and there is a vray light - skylight simple in the window (on the interior, just in front of the glass) - default settings

Gamma is set to 2.2 input and output (i don't like to do much work in post, and i also save to exr) affect color selector, and affect material editor

Vray physical camera - focal 2mm, f=6, shutter 1/100, iso 4600:confused:

Render settings:

color mapping: linear multiply, gamma 2.2, sub pixel mapping on, affect background on, don't affect colors on

irradiance map: min rate:-3, max rate:-1, HSph:120, Interp. Samples:40, clr thresh:0.4, Nrm thresh:0.2, Dist thresh:0.2

interpolation: least squares fit

light cache: subdivs:1500, sample size0.002

 

I think the shadows are not visible/sharp enough, and i would like to improve.

Also I don't know if it's normal to use such high ISO values.

 

I would appreciate some advise on how to reduce burnout areas. (i could render passes and composite them and mask the burnout areas?)

 

Thank you!

 

http://imageshack.us/photo/my-images/24/mirceamurarescu0116c01.jpg/

does this forum down-samples the attached images?

Edited December 21, 2012 by andstef
curious

[davidallen]

Andrei, to reduce burnout areas try to use another color mapping: Reinhard (reduce Burn value to 0,75 approximately) or HSV exponential. And don't affect colors.

[andstef]

Thank you for your reply David. I will try to work with reinhard color mapping.

I didn't try this yet because all the tutorials I read about LWF lately suggested to use linear multiply (I don't know why).

 

I gave the scene another try with higher light cache and iradiance map settings, and the shadows are better now.

 

I'm still wondering about the ISO value of the v-ray camera? is 4000 a normal value for an interior shot? (I never used a value greater than 800 when taking pictures with my DSLR)

 

Thank you

[davidallen]

You've written that you are using Gamma 2.2 and don't like to do much work in post. LWF is used by those who use other programs to compose render elements. So, if this is not your case, feel free to use any type of color correction. Your setup needs to be corrected a little bit.

My settings:

- Gamma is set to 2.2 input and 1.0 to output (I use Vray Frame Buffer, in standard one the picture will look like light-struck, but everything will be ok after saving)

-affect color selector \ affect material editor

color mapping: Reinhard or HSV, gamma 2.2, sub pixel mapping off (on if necessary), affect background on, don't affect colors off (on only for LWF)

Concerning the camera settings, then it is more logical to use the real values. For ISO I usually use 400-800 for the interior. I do not use DOF, that's why I set F-number by default. To control the light of the image I only change the shutter speed. In real world greater values for ISO make foto grain, and therefore it is not used. But we're not in the real world, isn't it?