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Quote:
Originally Posted by RiouÂ

Interpolation means the computer chip inside mouse creates "new data points" between known discrete points. In other words, those are just estimates or guesses based off the native DPI data. It may not be as accurate since it depends upon a mathematical model and not true sampling data.
Scaled down DPI divides evenly from native DPI. It still using the native DPI resolution sampling data. It just omits some data (i.e. 400 DPI from native 800 DPI).

Great, thanks! Now I understand that.

So does that mean that interpolation = any non-native dpi step?

+

1) All interpolated steps that are higher than the highest native step, are bad and should be avoided due to calculation errors/estimates?

2) All interpolated steps that are lower than the highest native step are "scaled down" or "halved counts" and it's not as bad, and can be used? Or does this only work if the dpi step is 1/2 of the native dpi step?
Is there no scaling down if it's for example, 1/4 of the native dpi? Like on Deathadder's case native dpi 1800, and using 450 would be 1/4 of the native dpi step.
Or this works no matter what % is the dpi step of native dpi step? This still called as "scaled down" or "halved" step and it's as good as the "halved" step 900 of 1800?

Thank you very much!!

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Quote:
Originally Posted by YaharÂ

Great, thanks! Now I understand that.
So does that mean that interpolation = any non-native dpi step?
+
1) All interpolated steps that are higher than the highest native step, are bad and should be avoided due to calculation errors/estimates?
2) All interpolated steps that are lower than the highest native step are "scaled down" or "halved counts" and it's not as bad, and can be used? Or does this only work if the dpi step is 1/2 of the native dpi step?
Is there no scaling down if it's for example, 1/4 of the native dpi? Like on Deathadder's case native dpi 1800, and using 450 would be 1/4 of the native dpi step.
Or this works no matter what % is the dpi step of native dpi step? This still called as "scaled down" or "halved" step and it's as good as the "halved" step 900 of 1800?
Thank you very much!!

Not quite. Interpolation can exist regardless of if it's higher or lower than native. In this mode, some or all of the data is based on mathematical predictions rather than actual observed data. Depending on the method used, those predictions can be pretty spot on most of the time, but there's always a chance even with the best solutions to get an incorrect value at any given time - even if it's only slightly incorrect.

As another user stated earlier, there are certain steps (exclusively below native) which are using true points of data. There is no room for error using this method since all the data is real.

Which steps use which method is entirely up the the designers - there is no general rule that can be applied to all mice. I can't tell you which mice use which steps but I'm fairly sure skylit or another user has already broken down a list of a couple popular mice including the DA.

Think of it as the resolution of an image on screen. 100%, the image is crisp. Every pixel is exactly where it belongs in relation to all other pixels. This is native dpi.

At 200%, everything is doubled in size but still correctly placed and proportioned. This is like a non-interpolated scale down.

If you try 161% however, you start getting issues when observing individual pixels. They do not all enlarge at the same rate. Some encroach into the space of others. Proportions on a small scale are thrown off. Colors start getting mixed to simulate the existence of pixels which simply do not physically exist, in order to attempt to force an image to scale to a size it's not physically capable of without distorting the overall size or dimension of the image. When you look at it quickly, or from afar, there is no visible issue, but upon closer inspection, depending on the algorithm used for scaling, you may observe a reduced image quality in some respect or another. This is an interpolated scale.
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Thanks for the Explanation Zero4549, I think I'm starting to understand it!

Interpolation = Any dpi step that is NON-NATIVE, either lower or higher than the native dpi?

The only thing I still don't understand is why for example if user says g400 400 dpi step is "scaled down" and halved counts from 800 dpi native. Is this not interpolation?

Then people say 450 dpi step on DA is interpolated, and not scaled down/halved steps? ~~

Is interpolation the term they both are, but people are just calling lower than native dpi steps as "Scaled down" because it is better than higher than native dpi steps, which they only call "interpolation" ?

Or are they completely different thing, scaling and interpolation?
Quote:
Originally Posted by YaharÂ

Thanks for the Explanation Zero4549, I think I'm starting to understand it!
Interpolation = Any dpi step that is NON-NATIVE, either lower or higher than the native dpi?
The only thing I still don't understand is why for example if user says g400 400 dpi step is "scaled down" and halved counts from 800 dpi native. Is this not interpolation?
Then people say 450 dpi step on DA is interpolated, and not scaled down/halved steps? ~~
Is interpolation the term they both are, but people are just calling lower than native dpi steps as "Scaled down" because it is better than higher than native dpi steps, which they only call "interpolation" ?
Or are they completely different thing, scaling and interpolation?

The following is not specific to mice but just data in general. Look at these graphs:

Linear interpolation

Cubic interpolation

The interpolated data curve is red. The sample data are bolded points. As you can see, the interpolation model you use may give different results. They are just estimates.

Now when people say scaled down, it is still using the measured sample data. Less data points (or counts) are taken. That is why it is not interpolated.

If we take away every other point on this graph, the remaining data points are still real and measured.
Edited by Riou - 5/3/12 at 10:47am
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Quote:
Originally Posted by YaharÂ

Thanks for the Explanation Zero4549, I think I'm starting to understand it!
Interpolation = Any dpi step that is NON-NATIVE, either lower or higher than the native dpi?
The only thing I still don't understand is why for example if user says g400 400 dpi step is "scaled down" and halved counts from 800 dpi native. Is this not interpolation?
Then people say 450 dpi step on DA is interpolated, and not scaled down/halved steps? ~~
Is interpolation the term they both are, but people are just calling lower than native dpi steps as "Scaled down" because it is better than higher than native dpi steps, which they only call "interpolation" ?
Or are they completely different thing, scaling and interpolation?

Not all lower-than native are interpolated, BUT all higher than native are.

Lower than native can be either interpolated or scaled down. Depends on the wishes of the manufacturer and the dpi you are trying to achieve.

Uusually, a step like 1/2 or 1/4 won't be interpolated because it is so easy to just use actual data.
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Just purchased a Razer DeathAdder Black Edition!

How do I go about swapping internals for a 1800DPI, any guides and places to get the hardware? I am in the UK.
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Alright, lol, now I understand it! Thanks a lot!
Quote:
Originally Posted by YaharÂ

Alright, lol, now I understand it! Thanks a lot!

Great!
Quote:
Originally Posted by 86JRÂ

Just purchased a Razer DeathAdder Black Edition!
How do I go about swapping internals for a 1800DPI, any guides and places to get the hardware? I am in the UK.

Do you have a V3 1800dpi on hand? Even a broken one will do if it's electronics still work. That's the easiest way to obtain the parts. If not, it's somewhat difficult to find the correct components. Hella and I could both likely guide you through the process once you have the parts on hand - its very simple.
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Not on hand, I will try and source one...couldnt find one for sale at the moment!
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Quote:
Originally Posted by 86JRÂ

Not on hand, I will try and source one...couldnt find one for sale at the moment!

Let us know. also check with friends if any have a broken deathadder you can play with. Perhaps you could tempt them with the prospect of "upgrading" it to 3500 dpi hint hint wink wink
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