@Todd99
Settings (the little gear wheel top right)/Picture & Sound/HDMI Display.
Mine is UHD 50fps 10bit. Click on it to see your options. The other UHD setting I have there is UHD 50fps 8bit.
You may have one or both of these; if so, 10bit is better, as long as the TV supports it.
My LG has a setting, under Picture/Additional Settings, for HDMI Ultra HD Deep Colour, which has to be set for each HDMI input individually. This is because not everything I connect may be able to support it, but it is the better option if the input can support it.
I think this may be what lets me choose 10bit rather than 8bit.
You may have a similar setting on your TV, but it may be somewhere else in the menu, and it may even be called something else - my Samsung calls it Enhanced HDMI for instance (and it needs to be On for the HDMI input my Roku Stick+ is on before the BBC iPlayer will let me watch in 4K, though I have no idea why).
But as you can see, there are a lot of things you can tweak, quite apart from Brightness etc., to get the optimum picture.
There’s a website called RTINGS.com which keeps a list of optimum settings for all the TVs they know about, and if you can get the exact model code for your Hisense, you can look up what RTINGS recommends.
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*** Longtime YouView box owner, BT Broadband customer, finally an EE TV subscriber ***
