WebEx Desk Pro brightness and contrast settings

[sbeukenkamp]

I purchased for my self as kind of Christmas present a Cisco Webex Deskpro. What a great device!.
One thing I can not figure out yet. Contrast and brightness. Brightness is automatic, but the contrast I can not control. The WebEx “overlay” contrast is fine, but by USB-C monitor input ( no difference with HDMI ) is not as crisp as it should. Black is not black and white is yellow-is.
When you have a “regular monitor” you have all kinds of schema’s and controls to alter the screen output.

Any thoughts?

[sbeukenkamp]

I have had replaced the Desk Pro (RMA), but the problem is exactly the same on the new one.

Now trying to use the color calibration options of the Mac OS, I now got a slightly better color.