Best resizing method

[drfsupercenter]

Just curious: I have some ripped DVD AVI files in 720x480, but I want to convert them to 640x480 so they are "true" 4:3. Here is a screenshot of VirtualDub's resizing options (I used Paint go make all the options show up at once... I know it looks weird!):



Which of these makes the best quality when resizing?

[anonymez]

lanczos

[drfsupercenter]

Alrighty! What is the difference between those anyway?

[anonymez]

some are faster/better quality than others

[drfsupercenter]

So Lanczos3 is the way to go? I will use it then! Thanks!

[techreactor]

Lanczos variations for Downscaling, I prefer lanczos4

Bicubic for upscaling, with a scale of 0.5

The difference is in the way the resizing is applied. lanczos will give you sharper pictures than Bicubic but less compression also.BicubicResize uses the Mitchell-Netravali two-part cubic.

[drfsupercenter]

So... how do I get Lanczos 4? And what does "Nearest neighbor" do? That seemed to work for a video that I tested.

[anonymez]

lanczos4 gives sharper picture, particularly for upscaling. seach google to get the filter. nearest neighbour is fast but lower quality

edit: you may want to read http://www.avisynth.org/Resize and

[tigerman8u]

divx website had an article on this (don't know if it's still there.

[drfsupercenter]

It says that Lanczos is good for upscaling... I am downscaling...

[anonymez]

lanczos is the best. whether you choose to take our advice and use it, is up to you...

[drfsupercenter]

Heh, yeah I will... just wondering. How do you get Lanczos4? All I have is Lanczos3, the normal one. (This is in VDub)

[anonymez]

How do you get Lanczos4?

you've gotta use avisynth for that. lanczos3 is fine, you won't notice any difference between them (you might if working with HD 1080i content)

[techreactor]

lanczos is the best.

Not while upscaling using xvid/divx (DVD sources are fine). Lanczos is bound to produce some artifacts during its upscaling process in the video.

[anonymez]

i'll rephrase that : lanczos is best for what drf is doing

i can understand upscaling dvd (i do that myself), but upscaling xvid/divx can only make things worse IMO...