Why do i need AA?

[Telhma]

okej, maybe a stupid question, but why do i need Anti-aliasing if I use the resolution of my screen.

If i put in my game settings that the game need to run att 1920x1080, and my screen also is that, why do i need AA then? as every pixel only can generate one color, it sounds strange to me that AA will make a effect here. If i tell my game to run att 800*600 i think it would make sence, because then every generated pixel would use like around 4 pixels on my screen. if the AA then try to make some of them look closer to the ones they are conected, I would realy understand the help of it, but else, sorry, i don't see it. 

I tryed to run a game by my self to see, i tested it on 1920x1080 with AA*4 and without AA, i could not see the difference.

 

greets

[LukaP]

 

because it alters the colours slightly, to produce more pleasing edges

[Lord Pantaloons]

Because jaggies are fucking awful

[XTankSlayerX]

If your me, and have a 770 and a sub 1080p monitor; you should just do some super sampling and use downslaced 1440p.

[Telhma]

 

because it alters the colours slightly, to produce more pleasing edges

yea, i understand that, but, if i select the full resolution, the game will generate every pixel, so there is no room anymore between the pixels to create slightly color alternating, or am i so wrong??

[VMaxMuffin]

yea, i understand that, but, if i select the full resolution, the game will generate every pixel, so there is no room anymore between the pixels to create slightly color alternating, or am i so wrong??

 

Your logic is correct but you misunderstand how AA works. On a basic level it essentially blurs the edges of lines. Which means that if you can imagine a diagonal line of red pixels on a white background, turning AA on would tint the surrounding pixels pink and make the edge less jagged.

 

How much you notice it will depend on the game you're playing, the dpi of your monitor and the distance you're sitting from your monitor. You said you couldn't really see it and in some games it is less noticeable than others, but there are some where I find it more noticeable.

[Telhma]

Your logic is correct but you misunderstand how AA works. On a basic level it essentially blurs the edges of lines. Which means that if you can imagine a diagonal line of red pixels on a white background, turning AA on would tint the surrounding pixels pink and make the edge less jagged.

 

How much you notice it will depend on the game you're playing, the dpi of your monitor and the distance you're sitting from your monitor. You said you couldn't really see it and in some games it is less noticeable than others, but there are some where I find it more noticeable.

Well, i think i understand, i tought the game would tell automaticly what color each pixle would have if i took full resolution. but, as i understand you well, it mostly just tells the video card it wants to draw a line "red" from point A to point B.

So, if i would play without AA. it would just use red and white pixels to do that? and if i put AA on X2 it would use some shades of pink, and if i put it on X4 it would even use more shades??? 

[Arty]

those are all good and all, but if your getting 100/120 fps+ on a 60hz monitor turn up AA, and drop it 2 around 60  

[Kyuubixchidori]

okej, maybe a stupid question, but why do i need Anti-aliasing if I use the resolution of my screen.

If i put in my game settings that the game need to run att 1920x1080, and my screen also is that, why do i need AA then? as every pixel only can generate one color, it sounds strange to me that AA will make a effect here. If i tell my game to run att 800*600 i think it would make sence, because then every generated pixel would use like around 4 pixels on my screen. if the AA then try to make some of them look closer to the ones they are conected, I would realy understand the help of it, but else, sorry, i don't see it. 

I tryed to run a game by my self to see, i tested it on 1920x1080 with AA*4 and without AA, i could not see the difference.

 

greets

play on a lower resolution screen I had to play on a 1366x768 display(or close to that, not sure exactly) and every wire looked horrible, even though it was maxed settings on battle field 4. turning on AA fixed that. its a hard concept to think about unless you actually see it. its less relevant on higher res screens. 

[VMaxMuffin]

Well, i think i understand, i tought the game would tell automaticly what color each pixle would have if i took full resolution. but, as i understand you well, it mostly just tells the video card it wants to draw a line "red" from point A to point B.

So, if i would play without AA. it would just use red and white pixels to do that? and if i put AA on X2 it would use some shades of pink, and if i put it on X4 it would even use more shades???

Essentially yes.

[typographie]

Well, i think i understand, i tought the game would tell automaticly what color each pixle would have if i took full resolution. but, as i understand you well, it mostly just tells the video card it wants to draw a line "red" from point A to point B.

So, if i would play without AA. it would just use red and white pixels to do that? and if i put AA on X2 it would use some shades of pink, and if i put it on X4 it would even use more shades??? 

 

That's about right.

 

Technically though, you don't "need" AA at all. Its there for you if you feel the jagged edges on things are more than you're willing to tolerate, but if you're comfortable without it don't use it. That said, you may find that once you develop an eye for it you start noticing things you used to miss.

[fcuckaduk]

[jaggysnake57]

Because jaggies are fucking awful

 

WTF man what did i ever do to you?

[Briggsy]

[Telhma]

Yes, i understand the efect, but i tought this was mainly just caused by resolutions. just like the first picture was taken with a screen resulution of 200*300 while the second picture was made with a screen resulution of 2000*3000 (I know those resolutions do not exist on monitors, but i try to explain my self)

[Briggsy]

Yes, i understand the efect, but i tought this was mainly just caused by resolutions. just like the first picture was taken with a screen resulution of 200*300 while the second picture was made with a screen resulution of 2000*3000 (I know those resolutions do not exist on monitors, but i try to explain my self)

 

I see what you're saying. I think some of the problem is that textures used in a game are stretched, or warped for perspective, and are not being displayed at their natural resolution. the game engine renders the edges of objects as fast as it can, leaving jaggys that are ugly (and smell bad).

[typographie]

Yes, i understand the efect, but i tought this was mainly just caused by resolutions. just like the first picture was taken with a screen resulution of 200*300 while the second picture was made with a screen resulution of 2000*3000 (I know those resolutions do not exist on monitors, but i try to explain my self)

 

Resolution only helps the perception of aliased edges because most high-resolution displays have denser pixel grids and therefore less distinct pixels. If you can't discern each pixel, a jagged edge isn't as objectionable. But if pixel density were held constant, I don't think resolution would affect the perception of aliasing.