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  • This depends on which revision of HDMI and Display Port the monitor supports, which revisions the cables themselves support, and what revisions of those standards the display adapter on the machine supports. Your question does not provide enough information to determine the reason the picture quality might be different.
    – Ramhound
    Commented Aug 6, 2019 at 14:19
  • You should start be switching the cables between the two monitors to see if the problem follows the cable type or stays with the monitor. Commented Aug 6, 2019 at 14:30
  • Check the monitor setting for your graphics card. HDMI might need adjusting to allow either full or limited "dynamic range". In the Nvidia panel it would be under Display -> Change resolution and at the bottom. I don't know where it would be on AMD or Intel drivers...
    – Mokubai
    Commented Aug 6, 2019 at 15:00
  • I'm just generally interested in whether this could be a real issue or not? I genuinely can't see the difference. It sounds like it could be, but how obvious might these differences be? Commented Aug 6, 2019 at 15:07
  • But yes, there is a potential for them to have different colour ranges depending on the defaults for both outputs. howtogeek.com/285277/…
    – Mokubai
    Commented Aug 6, 2019 at 15:11