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Aliasing depends by only PPI ?

P

paulgur

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Joined
Nov 27, 2013
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46
Aliasing in games in a display depends only by PPI or also by total number of points ?

Many users said that 1440p bring much more sharpness in games also than small 1080p ( 22-23 inch ) or 29 ultra wide, but i see only a little difference in PPI :

23" 1080P = 0.265mm - 95ppi
29" 2560x1080 = 0.263mm - 97ppi
27" 1440p = 0.233mm - 108ppi

less than 10% of difference then how is possible to have a big difference with a 27" 1440p ?
 
If you measure by PPI² (pixel per square inch) you get a roughly 22% difference...
23" 1920*1080 = 9174 PPI² = 77.52%
29" 2560*1080 = 9180 PPI² = 77.57%
27" 2560*1440 = 11834 PPI² = 100%
This might explain it...
 
What do you mean by 'total number of points'?

Also, it's all subjective, and depends on lots of external factors such as visual acuity and distance from monitor. Those things need to be considered if you evaluate other people's testimonials.

Not to mention that the more you spend on something, the more likely your are to 'notice a difference'. ;)
 
paulgur said:
but i see only a little difference in PPI
Click to expand...

Have you seen a 27" 2560X1440 screen in person? Pretty massive difference. I hadn't ever seen one until pretty recently, to be honest. But I still like 1080p screens, too. Your thread concerns this term "aliasing". I take this to mean the "stair-step effect" of edges and lines not appearing straight but jagged. With photographs this isn't an issue because the original content is analog and smooth.

In games it is a problem. So with a 24" 1080p we use anti-aliasing, the more the better to a point. Then we try a 27" 1440p display using same amount of anti-aliasing, is a crap-ton sharper. Eye-popping. If you don't have good GPU power then 1440p is a trade off from 1080p, but still "better" because 27" is bigger than 24", and bigger is ALways better. right?

If you take a bad photograph and shrink it you might get some appreciable gain in sharpness or clarity, but it's still a bad photograph. If your content is good to begin with, it's better to blow it up, then use software tricks to smooth... I like to play old games made for 720p... rerender them at around 4k res and then use that to overlay 1440p. Add on post-processing effects and more hardware AA and these games are like new.
 
Bluesun311 said:
Have you seen a 27" 2560X1440 screen in person?
Click to expand...
Yes Apple Cinema only but never play games.

I take this to mean the "stair-step effect" of edges and lines not appearing straight but jagged.
Click to expand...
Yes

Then we try a 27" 1440p display using same amount of anti-aliasing, is a crap-ton sharper. Eye-popping.
Click to expand...
Excuse me, can you explain me better this phrase please ? i think i dont understood. :)
Have you try games in 1440p compared to small 1080p ? ( 23" or 29" ultra wide )
Can be sharper but aliasing is evident or not ?

If you don't have good GPU power then 1440p is a trade off from 1080p, but still "better" because 27" is bigger than 24", and bigger is ALways better. right?
Click to expand...
No bigger for me is not better, for the VGA question im ready to change it anytime.
 
Last edited:
paulgur said:
can you explain me better this phrase
Click to expand...

Sure. :) I'll try.

Anti-Aliasing = smoothing effects from GPU and software. This reduces the "stair step" effect

If you have a 1080p monitor and use anti-aliasing and post-processing effects from GPU driver to improve "stair step" effect, you can make 1080p look good.

It is the same for 1440p.

Compare 1080p with no processing that improves aliasing to 1440p also with no processing-- apples to apples--1440p is much sharper no question.

So, if you can use enough GPU power to play 1440p with anti-aliasing ON, you will experience a greater degree of detail and "smoothing" of this aliasing than is possible at 1080p. It is true. Is it necessary??? I dont know... some 1080p screens are very very good still. 1080p is usually faster (come on Asus ROG Swift!) matrix and smaller screen can be better for gaming anyway, easy to see whole screen.
 
Uh, I compare the glossy Catleab 2b to the Acer 22" H226HQL and the catleap looks like a blurry mess in that comparison.:(
 
PPI takes a backseat to the amount of pixels available for rendering the screen in my book. 1440p does have jaggies but they are much smaller and unnoticeable .

Received an X-Star DP2710 this monday. The clarity of games in this res excites me a lot!
 
I think the resolution is being a little over looked
1920x1080 is 2073000 compared to 2560x1440 at 3,686,400. That's a difference of 1,613,400 pixels to fill. Semi close to double.
 
What actually matters for aliasing are 2 things: PPI, and View distance.

The higher either of them get, the less aliasing you can perceive. So when a 27inch 1440p screen has a similar PPI to a 1080p 22 inch screen, your actual gain is in view distance (ideally you would sit farther away from a 27 inch monitor). Hence why you can have phones and tablets with resolutions approaching 1080p on screens from 4-10 inches in diagonal measurement. The view distance is so small that a very high PPI is required to counteract that.
 
Its not just PPI but total resolution to. Even if the PPI isn't that much different you are still rendering the exact same image but using double the number of total pixels and due to the physical size difference yes it will be larger on the screen but it also will be rendered with a lot more pixels.
 
The PPI is a bit higher yes, but ultimately I think jaggies are killed by rendering the same image with 80% more pixels compared to 1080p.

I received an X-Star DP2710 this monday and retired a 24" 1080p monitor, and I am enjoying the extra clarity and lack of jaggies immensely.
 
Only display I have ever used where I didn't notice the jaggies in games with no AA is my 22 inch 4k displays and my macbook retina.
 
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