From: nicolas Date: Sun, 10 Oct 2010 20:49:01 +0000 (+0000) Subject: comments X-Git-Tag: 7.0.1-0~8701 X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=6ca6e9664597e8f703d5a545aa1fb46c6a2227dc;p=imagemagick comments --- diff --git a/magick/resize.c b/magick/resize.c index 09d0cbada..485a8fe31 100644 --- a/magick/resize.c +++ b/magick/resize.c @@ -528,12 +528,13 @@ static MagickRealType Welsh(const MagickRealType x, % % The Lanczos2D and Robidoux filters are tuned for cylindrical % (radial) EWA (Elliptical Weighted Average) distortion. Lanczos2D -% is a 2-lobed Lanczos filter using Sinc or Jinc (as appropriate). -% Robidoux used to be a slightly sharpened version of Lanczos2D (with -% blur=0.958033808); Now, it is a Cubic 'Keys' filter tuned so that -% images with only vertical (or horizontal) features are exactly -% preserved when performing 'no-op" with EWA distortion, which turns -% out to be close to both plain Mitchell and "sharpened" Lanczos2D. +% is a 2-lobed Lanczos-like filter using Jinc (for EWA) or Sinc. +% Robidoux used to be a sharpened version of Lanczos2D (with +% blur=0.958033808). Now, it is a Cubic 'Keys' filter tuned so that +% images with only vertical or horizontal features are exactly +% preserved when performing 'no-op" with EWA distortion. Robidoux +% turns out to be close to both plain Mitchell and "sharpened" +% Lanczos2D. % % Special 'expert' options can be used to override any and all filter % settings. This is not advised unless you have expert knowledge of