[ricardo]

I think about the new test and wonder me. The first new scene looks like a semi exterior scene with much direct light and only a few effective GI bounce. So, we can not compare it to the beta scene.

The second new scene let me wonder, I can change the brightness of the wall, but get the same brightness ratio between the white wall and the interior materials at every image. I'm not sure - will we see fine color variations anymore? We can change the wall color brightness 20% and don't see any effect?
Also, the front part of the scene is very dark, so I feel, the scene doesnt use much bounced lights.

Why not the same scene again like for the beta? Are colors above 200 cutted? Most, textures are between 0 ... 255. Will this textures compressed in the bright part?

At Vray I know the option to set the secondary GI engine at 80%. Than I would get a GI light solution without dull contrast too. Do Maxwell the same now? Or is color 255 equal to 80% and Maxwell correct internal all textures and colors?

Hi Micha,

I'd say that since all materials but the white walls are receiving indirect light, their brightness is dictated by the white walls' reflectance - if you cut it by 50%, 50% less light will be available to be bounced, so everything else will go dimmer.

See this image, leveled in photoshop with clipping levels (0 - 1.00 - 128):

(sorry for ruining it jomaga )

You can see that as brighter the walls go, the more light available, the more white clipped areas.

It does seem that NL managed to optimize the thing.

Cheers,

Ricardo

[Maya69]

thank you

[Micha]

Thank you Ricardo. So, the color intensity seems to be compressed, so that a difference between 200 and 255 is not visible under normal conditions. If I look in my RAL/NCS color tables, than I see colors between 200 and 255. I ask me, how good we will see a difference between it?

[lllab]

micha,
the color of a photo, or a maxwellrendering depends absolutly on the fstop, shutter and iso!
but in realty there is no rgb 255 white. the ral white is looking white that might resemble something like 225max(in rgb).

the white above is only because all images have a "too long" shutter speed
cheers
stefan

[ricardo]

Hi Micha,

I'm not sure if I got what you mean, but look at this:



These are 50X50 cuts from the top left corner of the images. The color difference is visible when you put those side by side. Trying to compare color areas in different images is misleading, since our brain compensates and takes contrast in account, not the colors themselves.

Ricardo

[Micha]

Ricardo, thank you for your research. Looks good. I have used a "durchschnitt" (maybe average in english) filter of photoshop at your image and have got an approx. constant color jump between the squares. So it seems to be, we don't need a correction factor, it works well with all colors.

[ricardo]