About Convolution3D

[gurabli]

Hi!

My question would be is it recomended to use Conv3D filter on a good quality DVD? (Matrix 2, Terminator 3 LOTR 2 etc...)

I use GKnot and I think about medium noise option
conv3d set to HQ. Or?

Or maybe some another filter?

Please help me about this,
everybody are saying Conv3d is so great, but I want to know when it is good to be used?

Thanx,

Gurabli

[jkwarras]

Originally posted by gurabli
My question would be is it recomended to use Conv3D filter on a good quality DVD? (Matrix 2, Terminator 3 LOTR 2 etc...)

I use GKnot and I think about medium noise option
conv3d set to HQ. Or?


Search this forum for discussions about convolution3d or denoisers, i did that when i didn't even know what avisynth and denoisers was and after a lot of readings i was able to know alittle bit what i was doing :) Before someone else answer that to you i will: experiment.

About convolution3d: remoive noise while preserving a fair amount of details in the image. What this actually do: decrease the need in bitrate. Results: with presets like HQ you don't notice any noticable quality loss even on very clean DVD (but this is my poitn of view). Try LQ preset if DVD have a lot of noise or grain.

Others good denoiser: Fluxsmooth.

The values by default in Gknot (medium, heavy noise) are quiet good. Use them. And if you want to check before aplying what will be the result, just load the avs generated by gknot in Virtualdubmod, there's a script editor where you can remove a filter and applyed another one, as gknot egenrate a script with all filters, but only applying the one that you selected it's very easy to change between filters just adding/removing the # before them.

Hope it helps

[KpeX]

Originally posted by gurabli
Hi!

My question would be is it recomended to use Conv3D filter on a good quality DVD? (Matrix 2, Terminator 3 LOTR 2 etc...)

I use GKnot and I think about medium noise option
conv3d set to HQ. Or?

Or maybe some another filter?

Please help me about this,
everybody are saying Conv3d is so great, but I want to know when it is good to be used?

Thanx,

Gurabli

IMHO, the answer to this question also depends on what codec you're using to compress. Back in my DivX encoding days I preferred a good smoother or two in the filter chain to help compressibility. Now I encode almost exclusively in XviD, and I get better results without any denoisers for a clean DVD source. XviD does a great job of retaining detail and compressing a detailed and sharp source, or approximating detail with artifacts when necessary.

[crOOk]

Hi gurabli!
If I can't fit a clean source to a certain size, I like to use PixieDust() it's included in "Dust" filters by Steady.
You'll find it at http://www.avisynth.org/users/warpenterprises/.
Unfortunately it's in a very early beta stage and still (...) very slow. It preserves most of the detail though. Even if you use it after resizing, it doesn't blur as much as C3D imo. This way it's a lot faster (no color conversions before resizing & lower resolution for PixieDust() to process).
Personally I prefer to do the filtering (like most other people) before the resizing and usually I don't even use PixieDust() on clean sources unless they're very hard to compress.

crOOk