Well, I discovered something new tonight. madVR bypasses the Nvidia video brightness/contrast/hue etc so when I slide them in the nvidia control panel nothing happens. OK, no big deal because I never used them anyway. However, the nvidia brightness/contrast/gamma/hue/digital vibrance settings for the desktop DO affect the rendered video. I never realised this, I had them set to some arbitrary value, my desktop looked OK and I wasn't really that bothered.
I have now tweaked them a little and made a vast improvement to the video, mainly lowered the contrast a touch to get much more detail in dark areas, and upped the digital vibrance a tiny amount which gives, to my eye at least, a more vibrant picture.
In response to 'nand chan' I played with the yCMS calibration values and to be honest I couldn't see a difference, so I am running with not calibrated mode for now. To be honest, I have no idea what so ever how all those calculations work, I have never read up on it and find myself being very lazy indeed in doing so. I'm prepared to accept that it's beyond me for the time being.
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