Don't affect colors (adaptation only)

[bob-cat]

This does not seem to do anything to my image until I uncheck it, but I don't want to bake it in as I am working in LWF, so what am I doing wrong?.
The color mapping settings I am using are:

Type: Linear multiply
Dark :1.0
Bright: 1.0
Gamma: 2.2

Cheers
Troy[/url]

[bob-cat]

Some tests to demostrate the problem.

This image has the "don't affect colors (adaptation only)" checked and the gamma at 2.2, so should sample the darker areas, but hasn't.



And this has it unchecked and the gamma left at 2.2, this is the sampling I want but it has now baked it into the image.



What am I doing wrong?

[vlado]

What are your GI settings?

Best regards,
Vlado

[bob-cat]

Hi Vlado,

Below are the Gi settings and the DMC Sampler is @ 0.85 and the noise threshold is 0.005.

[bob-cat]

Can anyone else give this a go, Vlado, and see if they can get the sampling to work.
Here is the max file:

http://www.fatdigital.com/Tests/Gamm...ionMapping.max

Max 9.
Vray 1.5 Final.

[dlparisi]

Works fine for me checking and unchecking "adaptation only". Max 9(32) and vray 1.5 final. Not sure what's going on with your system.

[MoonDoggie]

Here are the results I get with gamma correction enabled in 3dsmax @ 2.2

Checked "Don't affect colors"



Unchecked "Don't affect colors"



Vray 1.5 final - Max 9 32bit

[vlado]

Thanks for the pointer; I found the problem, but I don't know if I will have time to correct it for this service pack since we are already running too late with it; it will be corrected for future builds though. If you use a higher Min. rate for the irradiance map and/or lower Color threshold, you might be able to work around the issue for this particular case.

Best regards,
Vlado

[bob-cat]

Thanks everyone for having a go:

Vlado - Thanks for looking into it, I will adjust these settings to get better sampling. and look forward to the fix.

MoonDoogie- to see the effect if you use the Vray frame buffer and enable the srgb button when you enable (adaptation only) and deselect the srgb when the (adaptation only) is deselected, always keep the gamma @ 2.2.

dlparisi - so you get the same sampling in the dark areas in both cases?

Cheers

[dlparisi]

Sorry for the confusion, I get results exactly like Moondog.

[bob-cat]

Seeing the "Don't affect colours (adaptation only) doesn't work atm.

I could leave this unchecked and leave the gamma at 2.2 so it burns it in.

Save it as an exr (LWF) then in post adjust it by the inverse gamma (0.4545).

The question is, if I adjust the gamma in post (by this amount 0.4545) does this degrade the image as apposed to it coming strait out of the renderer with the right gamma?

Cheers