Lanczos2D comments

diff --git a/magick/resize.c b/magick/resize.c
index 28dd3aba49801ea88fe1be3075ee22e159595120..bb76846753a4a0ba728e25f87dabd9634a161435 100644 (file)
--- 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.