Displaying a game in 2560x1440 on a 3840×2160 native panel.

Discussion in 'Hardware Components and Aftermarket Upgrades' started by ignorant, Aug 20, 2020.

  1. ignorant

    ignorant Notebook Consultant

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    So I'll be getting a 4K UHD panel soon, with native resolution of 3840×2160.
    Assuming that I can't quite push games in full details at that resolution, I will be playing mostly in 2560x1440.

    But I'm thinking, if the game is internally rendering an image at 2560x1440 pixels, and then upscaling it to 3840×2160, won't that result in a distorted image? Because 3840×2160 is 1.5 times 2560x1440, so that should mean that to fill the screen of a 3840×2160 panel, only 1 in 2 pixels of the image rendered at 2560x1440 will be repeated twice. Isn't that right? And doesn't that distort the image? Because it's not an even upscale. For example if we display an image rendered at 1920x1080 on a 3840×2160 panel, then each pixel is repeated twice (both veritically and horizontally, so it becomes a 2x2 pixel area), and there's on problem. But that's not the case with 2560x1440. This sounds complex to visualize so I made a little image to represent it:

    [​IMG]


    So how is this distortion issue avoided?
     
  2. bennyg

    bennyg Notebook Virtuoso

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    The dp is so fine, I can barely tell in a game, even when I get in close and go looking for it. 4k on 17" is 260ppi or 10px/mm, this overkill is more than enough to hide the scaling issues at a normal viewing distance

    At windows desktop, it is noticeable on some text, especially small/fine text

    Sent from my Redmi Note 8 Pro using Tapatalk
     
  3. saturnotaku

    saturnotaku Notebook Nobel Laureate

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    Play at 1080p, and assuming you have an NVIDIA GPU based on the Turing architecture (RTX, GTX 16XX), enable integer scaling from the driver control panel. This essentially makes the game look like it is running at 1080p without any of the interpolation that occurs when using an LCD at something other than its native resolution.
     
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  4. ignorant

    ignorant Notebook Consultant

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    I don't think there's any problems playing on 1080p on a 2160p native screen, since the scaling is done properly, 1:2.
    The problem is upscaling 1440p to 2160p, since in that case only some pixels get doubled, so the image is overall distorted.
    Playing at 1080p is not a solution for me. Since the hardware is capable, I'd like to render at least at 1440p.
     
  5. Khenglish

    Khenglish Notebook Deity

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    There is some blurring with 1440p, but there is still more detail a running 4k screen at 1440p than running 1080p on a 1080p screen.
     
  6. aarpcard

    aarpcard Notebook Deity

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    Why not get a 1440p panel instead? Or upgrade your GPU to be able to render in 4K satisfactorily? Anything else sounds like a compromise you are not willing to make.
     
  7. ignorant

    ignorant Notebook Consultant

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    To be honest, right now even the 2080 Super can't properly deliver all games at max settings and 4K.
    There's only two choices for the panel, 1080 or 4k. I'm not sticking to 1080p for another 5 years so definitely going for the 4K panel.
     
  8. aarpcard

    aarpcard Notebook Deity

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    . . . how about 1080 SLI . . . (had to say it lol)

    But in all seriousness, I'm sure they make 17" 1440p panels that you should be able to swap in. What computer?
     
  9. ignorant

    ignorant Notebook Consultant

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    That's okay, I actually want a 4K regardless, I'm just puzzled that 1440p doesn't scale properly and I'm surprised there's no fix for it.
     
  10. Khenglish

    Khenglish Notebook Deity

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    1440p 17.3" panels do exist. The P870 series had one available for a while. You'd have to switch the panel yourself though. idk if the cable connectors would match. 1440p should still be 4 channel eDP for a 40 pin connector, but older connectors were all .5mm pitch connectors, while some newer ones are .4mm pitch.
     
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