From: nicolas <nicolas@git.imagemagick.org>
Date: Fri, 8 Oct 2010 00:30:57 +0000 (+0000)
Subject: Lanczos2D comments
X-Git-Tag: 7.0.1-0~8728
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=4028f7a1b28a656330a2685748e8f540bd89763f;p=imagemagick

Lanczos2D comments
---

diff --git a/magick/resize.c b/magick/resize.c
index 28dd3aba4..bb7684675 100644
--- a/magick/resize.c
+++ b/magick/resize.c
@@ -938,9 +938,11 @@ MagickExport ResizeFilter *AcquireResizeFilter(const Image *image,
 	 * half of one percent of the dynamic range).
 	 *
 	 * Note that "high frequency modes" which are not aligned with
-	 * pixel directions are still considerably damped. The
-	 * amplitude of the checkerboard mode, for example, is reduced
-	 * by 62%.
+	 * image rows or columns are damped considerably. For example,
+	 * the amplitude of the very highest energy mode, the
+	 * so-called "checkerboard" mode, is reduced by almost 62%
+	 * (still less than with "standard" Lanczos2D a comparable
+	 * Gaussian kernel).
 	 *
 	 * This "optimal" scaling was discovered by Nicolas Robidoux
 	 * of Laurentian University.