23rd February 2009, 23:07
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#4
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Senior Member
Join Date: Apr 2004
Posts: 1,053
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LanczosResize is an alternative to BicubicResize with high values of c about 0.6 ... 0.75 which produces quite strong sharpening. It usually offers better quality (fewer artifacts) and a sharp image.
Lanczos was created for AviSynth because it retained so much detail, more so even than BicubicResize(x,y,0,0.75). As you might know, the more detail a frame has, the more difficult it is to compress it. This means that Lanczos is NOT suited for low bitrate video, the various Bicubic flavours are much better for this.
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Spline16Resize & Spline36Resize & Spline64Resize
Three Spline based resizers. The rational for Spline is to be as sharp as possible with less ringing artefacts as LanczosResize produces. Spline16Resize uses sqrt(16)=4 sample points, Spline36Resize uses 6 sample points, etc ... The more sample points is used, the sharper your clip will get.
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Code:
http://avisynth.org/mediawiki/Resize
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