Yellowish Strange arcs in exterior render

[mostafa999]

Hi all I noticed when I render an exterior scene I get some yellowish arcs in areas with indirect light, I have attached two pics 1R&2R, 1R is the original render, 2R I put the original image on photoshop and increased colour vibrance to see the effect better

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[Dave R]

What rendering app?

[mostafa999]

@dave r said:

What rendering app?

vray sketchup, Adaptive DMC image sampler, irradiance Primary engine, light cache secondary engine

[Gwint]

I have the same problem ...http://sketchucation.com/forums/viewtopic.php?f=322&t=53929

[andybot]

change the color of your box to a light gray. Vray will have difficulty with pure white color.

Also do realize that there are only 256 levels of gray (in the 8bit RGB color space), so if you increase the contrast in an image like that, you will start to see the transition between different levels of gray.

[dcauldwell]

To me this looks like jpg artifacts. Outputting as a png file should see that 'rainbow' shading disappear.

David