Can you run 1080P full screen on a 4K display?

[AstroBenny]

If you have a 4K display and run it at 1080P will you just get 4 of the same pixel for every pixel in 4K?

How would it work with a 2560x1440 display? Does it have to round off the pixels as 1920x1080 doesn't divide into 2560x1440.

[rattacko123]

5 minutes ago, AstroBenny said:

If you have a 4K display and run it at 1080P will you just get 4 of the same pixel for every pixel in 4K?

How would it work with a 2560x1440 display? Does it have to round off the pixels as 1920x1080 doesn't divide into 2560x1440.

Depends how good the scaler is in the monitor. Some 4k monitors recognise the 1080p signal and scale it accordingly, but most 4k monitors just do normal scaling which blends/rounds off the pixels and causes blurriness.

EDIT: Using 1080p with 1440p will cause bluriness because it has to round off the pixels

[ShadowCaptain]

3 minutes ago, rattacko123 said:

SNIP

This basically

monitors user interpolation to "make up" the resolution, some do it better than others and very much depends on the monitor in question

You are best running at native resolutions when possible

[mcraftax]

this should explain it

[porina]

On nvidia at least, you can also do the scaling in GPU. I had to use that to maintain aspect ratio scaling as one monitor stretched to fit.

[AstroBenny]

9 minutes ago, ShadowCaptain said:

This basically

monitors user interpolation to "make up" the resolution, some do it better than others and very much depends on the monitor in question

You are best running at native resolutions when possible

So I'm wrong in thinking that displaying 1080P content on a 4K display will effectively just display four pixels for each 1080P pixel?

[AstroBenny]

21 minutes ago, rattacko123 said:

Depends how good the scaler is in the monitor. Some 4k monitors recognise the 1080p signal and scale it accordingly, but most 4k monitors just do normal scaling which blends/rounds off the pixels and causes blurriness.

EDIT: Using 1080p with 1440p will cause bluriness because it has to round off the pixels

But I'm right in the general concept of just filling in 4 pixels for each pixel in 1080P when viewing on a 4K display?

[ShadowCaptain]

1 hour ago, AstroBenny said:

So I'm wrong in thinking that displaying 1080P content on a 4K display will effectively just display four pixels for each 1080P pixel?

Not how it works

[AstroBenny]

17 minutes ago, ShadowCaptain said:

Not how it works

 Wouldn't that be a simpler solution though?

[ShadowCaptain]

Just now, AstroBenny said:

 Wouldn't that be a simpler solution though?

Well they generally upscale so they try and add more information into the "inbetween" pixels

honestly though, if somebody is buying a 4k monitor, run it at 4k, especially as its likely it will be a LARGE monitor and 1080p above 22" looks shit anyway 

[AstroBenny]

6 minutes ago, ShadowCaptain said:

Well they generally upscale so they try and add more information into the "inbetween" pixels

honestly though, if somebody is buying a 4k monitor, run it at 4k, especially as its likely it will be a LARGE monitor and 1080p above 22" looks shit anyway 

Yes, I don't intend on buying a 4k monitor, I'm just interested in how it works

 

[ShadowCaptain]

6 minutes ago, AstroBenny said:

Yes, I don't intend on buying a 4k monitor, I'm just interested in how it works

 

Read up on interpolation

[AstroBenny]

21 minutes ago, ShadowCaptain said:

Read up on interpolation

Have done. I understand the methods.

But I don't understand why you can't just apply my "genius" method because I swear it would work perfectly..

[ShadowCaptain]

3 minutes ago, AstroBenny said:

Have done. I understand the methods.

But I don't understand why you can't just apply my "genius" method because I swear it would work perfectly..

Because id rather have it interpolated than to look like 1080p

maybe its harder to make pixels behave as large super pixels, no idea

[raendeu]

You can see a difference between 1440p and 4K on a 4K Panel. (I have a 32' BenQ 3840x2160)

I would NOT recommend IN ANY CASE EVER using 1080p resolution. It'd look awful.