Re: [Gimp-developer] Downscaling quality

2007-08-10 Thread gg
Hi, just sending this link again since I dont think my last post got to the m.l. It's the article Graeme refers to which covers all this rather well. http://www.worldserver.com/turk/computergraphics/ResamplingFilters.pdf /gg ___ Gimp-developer mai

Re: [Gimp-developer] Downscaling quality.

2007-08-10 Thread Sven Neumann
Hi, On Fri, 2007-08-10 at 10:54 +0200, Geert Jordaens wrote: > I get the feeling that we are mixing 2 things here. > > 1. scaling for display purposes (uniform X and Y scaling) > 2. scaling as a effective drawing transformation. (X and Y scale can be > different) For the second case, it only n

Re: [Gimp-developer] Downscaling quality.

2007-08-10 Thread gg
On Fri, 10 Aug 2007 04:34:03 +0200, Graeme Gill <[EMAIL PROTECTED]> wrote: > Øyvind Kolås wrote: >> More theoretically correct >> resampling methods like a Sinc filter with an infinite neighbourhood >> definitly is not something one would want in the view code. I'm not sure what you mean by vie

Re: [Gimp-developer] Downscaling quality.

2007-08-10 Thread Geert Jordaens
Øyvind Kolås wrote: > On 8/9/07, Graeme Gill <[EMAIL PROTECTED]> wrote: > >> Øyvind Kolås wrote: >> >>> This code implements a perfect box filter for this case, what needs to >>> be added on top >>> of this to be able to do good estimate (maybe even exact) box filter >>> resamplings is tril