I am using the method layed out by Rob Nederhorst http://throb.net/wp-content/uploads/2009/10/Linear\_workflow.pdf
and Typically yes, I use sRGB for preview only. I guess it and the monitor profile are too far apart?
as I understand it when you check dont affect colors Vray calcs the light in the correct gamma space but does not affect the colors
so you have to add the 2.2 back to the image when it is used with sRGB preview to see it in VFB then of course whatever method you use
for post cc.
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Srgb is roughly around 2.2 and a good average, so if you’re calibrating your monitor you aim for 2.2 and it’s pretty close.
With don’t affect colours on, vray won’t apply any gamma curve to your image, but what it’ll do is recognise that shadow areas of your image that are dark now, will be made much brighter after the gamma and appear really noisy, so it does extra sampling in the shadow areas to cover for the extra visibilty they’ll have afterwards.