David Gowers wrote: > On 9/24/07, Andrew <[EMAIL PROTECTED]> wrote: > >> Hi, >> >> How does 'sinc (lanczos3)' interpolation compare with the others for >> quality? >> > > For upscaling, it's roughly like sharpening the image and scaling it > up with Linear interpolation. That is not the method, just how the > result looks. > Arguably this counters the typical blurring incurred by upscaling. > Personally I've always preferred manual sharpening to using Lanczos. > > Lanczos downscaling is interesting, but you won't find that in your > copy of gimp -- it's still being worked on. > > The Wikipedia article certainly was over my head.
From what I read on the Gimp bug page lanczos scaling is not yet perfect. (But then what is?) I have to upscale images from 16M to 48M and it seems the client takes them apart and looks at them through a microscope and rejects them if there are signs of sharpening or interpolation artefacts. So far as I can see, my Gimp (2.4.0-rc2) does have lanczos downscaling Thanks for your help, Andrew _______________________________________________ Gimp-user mailing list [email protected] https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
