diff --git a/ChangeLog b/ChangeLog
index df285c4..ccb4d2b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2010-11-13 6.6.5-9 Nicolas robidoux <nicolas.robidoux@gmail...>
+ * LanczosSharp blur tweaked to minimize worst case scenario deviation
+ from "perfect preservation of images which only vary horizontally (or
+ vertically)" under no-op.
+
2010-10-29 6.6.5-9 Glenn Randers-Pehrson <glennrp@image...>
* Revised PNG encoder to avoid emitting some spurious warnings.
diff --git a/config/configure.xml b/config/configure.xml
index aa56103e..e836742 100644
--- a/config/configure.xml
+++ b/config/configure.xml
@@ -9,7 +9,7 @@
<configure name="NAME" value="ImageMagick"/>
<configure name="LIB_VERSION" value="0x665"/>
<configure name="LIB_VERSION_NUMBER" value="6,6,5,9"/>
- <configure name="RELEASE_DATE" value="2010-11-11"/>
+ <configure name="RELEASE_DATE" value="2010-11-13"/>
<configure name="CONFIGURE" value="./configure "/>
<configure name="PREFIX" value="/usr/local"/>
<configure name="EXEC-PREFIX" value="/usr/local"/>
diff --git a/magick/resize.c b/magick/resize.c
index 9eb279e..84397cd 100644
--- a/magick/resize.c
+++ b/magick/resize.c
@@ -532,38 +532,36 @@
% and rational (high Q) approximations, and will be used by default in
% most cases.
%
-% Lanczos filter is a special 3-lobed Sinc windowed Sinc filter,
-% (or cylindrical promoted Jinc-Jinc filter). This filter is
-% probably the most popular windowed filter.
+% Lanczos filter is a special 3-lobed Sinc-windowed Sinc filter
+% (promoted to Jinc-windowed Jinc for cylindrical use). This is the
+% most popular windowed filter.
%
-% LanczosSharp is a slightly sharpened (blur=0.98303932214489908)
-% form of the Lanczos filter. It was designed specifically for
+% LanczosSharp is a slightly sharpened (blur=0.9812505644269356) form
+% of the Lanczos filter. It was designed specifically for
% cylindrical EWA (Elliptical Weighted Average) distortion (as a
-% Jinc-Jinc filter), but can used as a slightly sharper orthogonal
-% Lanczos (Sinc-Sinc) filter. The chosen blur value comes as close as
-% possible to satisfying the following condition without changing the
-% character of the corresponding EWA filter:
+% Jinc-Jinc filter); it can also be used as a slightly sharper
+% orthogonal Lanczos (Sinc-Sinc) filter. The chosen blur value comes
+% as close as possible to satisfying the following condition without
+% changing the character of the corresponding EWA filter:
%
% 'No-Op' Vertical and Horizontal Line Preservation Condition:
% Images with only vertical or horizontal features are preserved
% when performing 'no-op" with EWA distortion.
%
-% The Lanczos2 and Lanczos2Sharp filters are simply 2-lobe versions
-% of the Lanczos filters. The 'sharp' version uses a blur factor of
+% The Lanczos2 and Lanczos2Sharp filters are 2-lobe versions of the
+% Lanczos filters. The 'sharp' version uses a blur factor of
% 0.958027803631219, again chosen because the resulting EWA filter
-% comes as close as possible to preserving vertical and horizontal
-% lines without changing its character. (There are other optimal
-% values; we use the least sharpening one).
+% comes as close as possible to satisfying the above condition.
%
% Robidoux is another filter tuned for EWA. It is the Keys cubic
% filter defined by B=(228 - 108 sqrt(2))/199. Robidoux satisfies the
% "'No-Op' Vertical and Horizontal Line Preservation Condition"
-% exactly. It also seems to provide only minimal bluring of a low
-% level 'pixel-hash' pattern in the 'No-Op Distort' case. It turns
-% out to be close to both plain Mitchell and Lanczos2Sharp filters.
-% For example, its first crossing is at (36 sqrt(2) + 123)/(72
-% sqrt(2) + 47) which is almost the same as the first crossing
-% of the other two.
+% exactly. Also, it minimally blurs high frequency 'pixel-hash'
+% patterns in the 'No-Op Distort' case. Robidoux turns out to be
+% close to both plain the Mitchell and Lanczos2Sharp filters. For
+% example, its first crossing is at (36 sqrt(2) + 123)/(72 sqrt(2) +
+% 47), almost the same as the first crossing of Mitchell and
+% Lanczos2Sharp.
%
%
% 'EXPERT' OPTIONS:
diff --git a/magick/version.h b/magick/version.h
index 013cd7b..d4ca7e6 100644
--- a/magick/version.h
+++ b/magick/version.h
@@ -33,8 +33,8 @@
#define MagickLibAddendum "-9"
#define MagickLibInterface 4
#define MagickLibMinInterface 4
-#define MagickReleaseDate "2010-11-11"
-#define MagickChangeDate "20101108"
+#define MagickReleaseDate "2010-11-13"
+#define MagickChangeDate "20101113"
#define MagickAuthoritativeURL "http://www.imagemagick.org"
#if defined(MAGICKCORE_OPENMP_SUPPORT)
#define MagickOpenMPFeature "OpenMP "