Log Message:
Changes 1.3.18:
Special Issues:

Due to GCC bug 53967, several key agorithms (e.g. convolution) may execute much \ 
faster (e.g. 2-3X) for x86-64 and/or when SSE is enabled for floating point math \ 
(-mfpmath=sse) if the GCC option -frename-registers is used. Default 32-bit \ 
builds do not experience the problem since they use '387 math. It is not clear \ 
in what version of GCC this problem started but it was not noticed by the \ 
developers until the GCC 4.6 timeframe. Other compilers do not suffer from this \ 
bug.
Security Fixes:

None.
Bug fixes:

Fixed bug with format substitutions if input string ends with a single '%'.
BMP: Fixed an old bug with decoding chromaticity primaries.
PNG: Fixed reading of interlaced images. Fix reading of sub-8-bit palette and \ 
grayscale images. Some PNG sub-formats were written incorrectly. Fix crash in \ 
PNG8 writer if image colors happened to be non-zero but image was not actually \ 
colormapped.
PNG: Configure script now also searches for libpng versions 16 and 17.
TIFF: Fix a crash which was noticed when writing RGBA separated (planar) format.
--enable-symbol-prefix was not prefixing all of the C symbols. Some core C \ 
library functions were not prefixed. This option applies to the Wand library API \ 
as well now.
C API: When input is from a user-provided file descriptor, the file position is \ 
restored after reading the file header bytes. Previously the file position was \ 
rewound to the beginning of the file. This allows reading embedded image data \ 
from the current offset in a file, and allows continuing to use the stream after \ 
GraphicsMagick has returned the image.
C API: It is now possible to invoke CloseBlob() multiple times.
display: Display was supposed to respond to +/-usePixmap, but was not. It was \ 
responding to +/-use_pixmap. Now it responds to both.
Windows/VisualMagick: Fix building GraphicsMagick with Intel ICC compiler driven \ 
by Visual Studio Professional 2012.
Windows: Avoid a crash and produce a useful diagnostic if Ghostscript is needed \ 
but not yet installed.
New Features:

GM utility: New 'batch' command was contributed by Kenneth Xu which supports \ 
executing any number of other GM utility sub-commands in a single invokation in \ 
a sort of "batch" script. Input may be piped from standard input, from \ 
a specified file, or from a 'GM >' command prompt. This utilities front-end \ 
allows any other program/script to drive 'gm' using a co-process model and \ 
speeds up execution by eliminating utility start-up/shut-down time.
WIN64 (64-bit Windows): Windows 64-bit is now officially supported.
convert/mogrify: Now support -auto-orient to automatically rotate the image \ 
upright for viewing based on its current orientation setting. Also support \ 
-orient to support setting the current image orientation. Please note that the \ 
orientation property of EXIF profiles is not yet updated so the EXIF profile \ 
will be wrong after using -auto-orient.
C API: AutoOrientImage(), new New function to automatically orient the image so \ 
that it is upright for normal viewing.
Wand API: MagickGetImagePage()/MagickSetImagePage(), new functions to support \ 
getting and setting the image page size and offsets.
PNG: Added PNG48 and PNG64 support. Added PNG00 support (png encoder that \ 
inherits its color-type and bit-depth from the input, if the input was a PNG \ 
datastream).
Feature improvements:

GraphicsMagick TAP tests may now be run stand-alone using Perl's 'prove' TAP \ 
test driver.
Performance Improvements:

Detection of glob specifications in file names is more efficient.
Windows Delegate Updates:

None.
Behavior Changes:

ltdl: Libltdl is no longer bundled. Libltdl must be previously installed on the \ 
system in order to build the modules configuration.
AppendImages() now converts subsequent images to the colorspace of the first \ 
image, and no longer converts the first image to RGB. Instead, it is assumed the \ 
user knows what she is doing.
SetImageColorRegion() no longer automatically converts the image to RGB. The \ 
user is responsible for assuring that the provided color is in the same \ 
colorspace as the image.