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Thread: Colour difference between DVI and HDMI

  1. #1
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    Colour difference between DVI and HDMI

    I just replaced my 4 year old Iiyama 26" with 2 identical LG 24" LED monitors.
    ATM I'm using a cheap Radeon 7750 card while I wait on the new R9 cards to arrive, so I can't run both of DVI as I would have liked to.
    This card has 1 DVI, 1 HDMI and 1 VGA. So obviously I'm using DVI and HDMI for the 2 monitors. Now, the monitor on the HDMI connection displayed the picture with overscan borders, so I used the Radeon driver to enable overscan compensation to remove it. But, the result is that the colour on that monitor is now different to the DVI one.
    It looks like you would expect it to if the picture were scaled and not using the monitors native. Hard to explain, it just looks a little 'off', and not quite as sharp as the one using DVI.
    Is there anything I can do to fix that? Or is that normal for HDMI?
    I'll be changing cards soon anyway, and hopefully the new R9 will have 2 DVI ports which will hopefully solve the issue. I say hopefully because I've noticed a lot of the current 78xx and 79xx only have 1 DVI.

    Quick edit. Catalyst control centre seems to identify them differently. It shows both screens as the same model number, but lists one as a 'digital flat panel' and the other as 'digital TV'.
    Last edited by Darxide; 10-06-2013 at 06:03 AM.
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  2. #2
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    The best way to handle this is to disable overscan in the monitor's setup menu (i.e. get into the menu of the monitor itself).

    Now the ugly part is some monitors do not have overscan settings.
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  3. #3
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    Quote Originally Posted by CrazyNutz View Post
    The best way to handle this is to disable overscan in the monitor's setup menu (i.e. get into the menu of the monitor itself).

    Now the ugly part is some monitors do not have overscan settings.
    Thanks for the suggestion. I looked in the monitors menu and overscan is already disabled.
    I'm convinced it's because of the way the driver is detecting them, but I can't find a way to change it.
    It has one listed as DFP @ 1920x1080, and the other as DTV @1080p.

    I guess I'll just have to put up with it until I get a new card with 2 DVI's.
    Desktop :-AMD Ryzen 1800X | ASUS Crosshair VI Hero | 16Gb Corsair LPX | Asus Strix Fury | Corsair MP500 480Gb (OS/Apps), Samsung 850 Evo 1Tb (Steam), WD Caviar Green 2Tb (Data) | Lian Li PC-09 WRX | Superflower Leadex Platinum 1600W | Win 10 Pro x64
    Notebook :-Alienware M17x R4 | Intel i7 3630QM | 8Gb DDR3 | AMD Radeon HD 7970M 2Gb | Crucial M4 512Gb | Win 7 Pro
    Media PC :- AMD Sempron LE 1300 | Gigabyte GA-MA78GM-SH2 | 780G chipset/Radeon HD3200 | 2Gb OCZ PC2-6400 | Crucial V4 128Gb | LG GGC-H20L | Win 7 Pro
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