Timeline for What causes aliasing?
Current License: CC BY-SA 3.0
13 events
| when toggle format | what | by | license | comment | |
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| Aug 22, 2015 at 14:35 | comment | added | user1118321 | Don't forget, aliasing happens in audio samples and all kinds of other signals, too! | |
| Aug 22, 2015 at 0:30 | comment | added | MartinTeeVarga | Your answer is missing pictures, otherwise it would definitely be the accepted one. Apart from the edge anti-aliasing example it needs: 1) animated gif of car wheels rotating clockwise and suddenly stopping and changing direction. 2) a 3D chess board (you know the one going to infinity)... I also studied signal processing. | |
| Aug 20, 2015 at 8:44 | comment | added | Luaan | @Kruncho Well, not in the static image. You could perhaps consider "choppiness" a form of aliasing, and that would be related to the FPS. When talking about the static image, the critical points are the resolution of the various elements - in simple terms, projecting a high-resolution image (3D in this case, but that doesn't matter) into a low-resolution display. Apart from edge-aliasing, there's also upload.wikimedia.org/wikipedia/commons/c/cd/Aliased.png - this is just a simple texture. Somewhat counter-intuitively, the fix is to lower the resolution of the texture (by mipmapping). | |
| Aug 20, 2015 at 6:28 | comment | added | Kruncho | Is the sampling that cause aliasing related to the FPS or it is more spacial ? Or one other way to ask that is what is the samplerate used ? I ask a lot but I think it's really interesting :) | |
| Aug 20, 2015 at 6:12 | vote | accept | Kruncho | ||
| Aug 20, 2015 at 11:33 | |||||
| Aug 20, 2015 at 4:26 | comment | added | Daniel Wagner | @jhocking The point is that it doesn't matter what shape the pixels are -- so it is not a side effect of the fact that pixels are square, it is a side effect of the fact that pixels don't change color over their extent. And anyway, a pixel is not a little square. | |
| Aug 19, 2015 at 17:40 | history | edited | mattnewport | CC BY-SA 3.0 |
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| Aug 19, 2015 at 17:39 | comment | added | mattnewport | @jhocking sorry, us graphics programmers tend to get a bit worked up over aliasing :) I think your answer addresses the question but if someone wants to go any deeper in computer graphics I think it's helpful to understand that aliasing is a mathematical phenomena with a bunch of theory behind it. All that technical detail comes in handy for the ultimate goal of making pretty pictures in our games :) | |
| Aug 19, 2015 at 17:36 | comment | added | Fuzzy Logic | +1 for technical correctness. Although a bit too technical given the level of the question asked and doesn't actually address the implied question. The accepted answer is more suitable to the intent of the question. I learned something new though, so thanks for the elaboration :) | |
| Aug 19, 2015 at 17:35 | comment | added | jhocking | On the one hand, hey I learned something new today, never heard of aliasing in any context other than graphics edges. That said, this additional technical detail doesn't seem to contradict the explanation "it is a side effect of the fact that pixels are square". "Discrete sampling" is just a fancy way of saying "the edge is actually a bunch of discrete pixels, not a continuous line". | |
| Aug 19, 2015 at 17:24 | history | edited | mattnewport | CC BY-SA 3.0 |
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| Aug 19, 2015 at 17:22 | review | First posts | |||
| Aug 19, 2015 at 17:25 | |||||
| Aug 19, 2015 at 17:18 | history | answered | mattnewport | CC BY-SA 3.0 |
