Colors in Thinkvisio​n 2480m 4k monitor

Link to picture 
Are the colors really that bad in this monitor that even my cheap 1080p BenQ (200eur 5 years ago or something) and Fujitsu (100eur 1,5 years ago) beat it by a mile by actually being able to show at least one shade of grey? [insert joke about a book about 50 of them not being readable on this monitor]
As you can see from the picture, the 'tiles' on my website http://tsatter.com (If you can, please confirm this is the same on your 2840m too) don't have the grey background like they should on the lenovo which is in the right side of the picture.
I've tried changing between the preset color settings and turning brightness and contrast up and down with no change in the grey  visibility.
By the way I already had this monitor changed once because it had terrible input lag.  The change went really well, I received a replacement within a week delivered to my doorstep. But that's about the only positive thing I can tell about this monitor. This new unit has less input lag, but it's still noticeable, whereas I've never used any other monitor where input lag is even a thing.
Suggestions? Help? A shoulder to weep on about what a miserable thing this monitor is?
Admin edit; picture >100K converted to link. About posting pictures in the forums.
Solved!
Go to Solution.

I noticed the same thing when I first received my monitor!
You may have figured it out since asking, but if not (or for anyone else), make sure your graphics card is set to Limited RGB.
In AMD control center, this is under My Digital Flat-Panels > Pixel Format
Changing this setting to RGB 4:4:4 Pixel Format Studio (Limited RGB) eliminated the problem completely.

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