Best resizing method

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  • drfsupercenter
    NOT an online superstore
    • Oct 2005
    • 4424

    Best resizing method

    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?
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  • anonymez
    Super Moderator
    • Mar 2004
    • 5525

    #2
    lanczos
    "What were the things in Gremlins called?" - Karl Pilkington

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    • drfsupercenter
      NOT an online superstore
      • Oct 2005
      • 4424

      #3
      Alrighty! What is the difference between those anyway?
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      • anonymez
        Super Moderator
        • Mar 2004
        • 5525

        #4
        some are faster/better quality than others
        "What were the things in Gremlins called?" - Karl Pilkington

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        • drfsupercenter
          NOT an online superstore
          • Oct 2005
          • 4424

          #5
          So Lanczos3 is the way to go? I will use it then! Thanks!
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          • techreactor
            Banned
            • Jul 2005
            • 1309

            #6
            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.

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            • drfsupercenter
              NOT an online superstore
              • Oct 2005
              • 4424

              #7
              So... how do I get Lanczos 4? And what does "Nearest neighbor" do? That seemed to work for a video that I tested.
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              • anonymez
                Super Moderator
                • Mar 2004
                • 5525

                #8
                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
                "What were the things in Gremlins called?" - Karl Pilkington

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                • tigerman8u
                  Lord of Digital Video
                  Lord of Digital Video
                  • Aug 2003
                  • 2122

                  #9
                  divx website had an article on this (don't know if it's still there.

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                  • drfsupercenter
                    NOT an online superstore
                    • Oct 2005
                    • 4424

                    #10
                    It says that Lanczos is good for upscaling... I am downscaling...
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                    • anonymez
                      Super Moderator
                      • Mar 2004
                      • 5525

                      #11
                      lanczos is the best. whether you choose to take our advice and use it, is up to you...
                      "What were the things in Gremlins called?" - Karl Pilkington

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                      • drfsupercenter
                        NOT an online superstore
                        • Oct 2005
                        • 4424

                        #12
                        Heh, yeah I will... just wondering. How do you get Lanczos4? All I have is Lanczos3, the normal one. (This is in VDub)
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                        • anonymez
                          Super Moderator
                          • Mar 2004
                          • 5525

                          #13
                          Originally Posted by drfsupercenter
                          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)
                          "What were the things in Gremlins called?" - Karl Pilkington

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                          • techreactor
                            Banned
                            • Jul 2005
                            • 1309

                            #14
                            Originally Posted by anonymez
                            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.

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                            • anonymez
                              Super Moderator
                              • Mar 2004
                              • 5525

                              #15
                              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...
                              "What were the things in Gremlins called?" - Karl Pilkington

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