libvips/README.md

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# libvips : an image processing library
[![Build Status](https://secure.travis-ci.org/jcupitt/libvips.png)](http://travis-ci.org/jcupitt/libvips)
libvips is a 2D image processing library. Compared to similar libraries,
[libvips runs quickly and uses little
memory](http://www.vips.ecs.soton.ac.uk/index.php?title=Speed_and_Memory_Use).
It has around 300 operations covering arithmetic, histograms, convolutions,
morphological operations, frequency filtering, colour, resampling, statistics
and others. It supports a large range of numeric formats, from 8-bit int to
128-bit complex. It supports a good range of image formats, including
JPEG, TIFF, PNG, FITS, Matlab, OpenEXR, and OpenSlide. It can also load
images via ImageMagick or GraphicsMagick.
It has APIs for C and C++ and comes with a Python
binding and a command-line interface. Bindings are
available for Ruby, JavaScript and others. There is [API
documentation](http://www.vips.ecs.soton.ac.uk/supported/current/doc/html/libvips/index.html),
plus a [tutorial-style
manual](http://www.vips.ecs.soton.ac.uk/supported/current/doc/html/vipsmanual/vipsmanual.html).
There's a GUI as well, see the [VIPS website](http://www.vips.ecs.soton.ac.uk).
There are packages for most unix-like operating systems and binaries for
Windows and OS X.
# Building libvips from source
In the libvips directory you should just be able to do:
$ ./configure
$ make
$ sudo make install
By default this will install files to `/usr/local`.
See the Dependencies section below for a list of the things that
libvips needs in order to be able to build.
We have detailed guides on the wiki for [building on
Windows](http://www.vips.ecs.soton.ac.uk/index.php?title=Build_on_windows)
and [building on OS
X](http://www.vips.ecs.soton.ac.uk/index.php?title=Build_on_OS_X).
# Building libvips from GIT
Checkout the latest sources with:
$ git clone git://github.com/jcupitt/libvips.git
Then for a debug build:
$ ./bootstrap.sh
$ CFLAGS="-g -Wall" CXXFLAGS="-g -Wall" \
./configure --prefix=/home/john/vips --enable-gtk-doc
$ make
$ make install
Leak check:
$ export G_DEBUG=gc-friendly
$ export G_SLICE=always-malloc
$ valgrind --suppressions=libvips.supp \
--leak-check=yes \
vips ... > vips-vg.log 2>&1
valgrind threading check:
$ valgrind --tool=helgrind vips ... > vips-vg.log 2>&1
Clang build:
$ CC=clang CXX=clang++ ./configure --prefix=/home/john/vips
Clang static analysis:
$ scan-build ./configure --disable-introspection
$ scan-build -o scan -v make
$ scan-view scan/2013-11-22-2
Clang dynamic analysis:
$ FLAGS="-O1 -g -fsanitize=address"
$ FLAGS="$FLAGS -fno-omit-frame-pointer -fno-optimize-sibling-calls"
$ CC=clang CXX=clang++ LD=clang \
CFLAGS="$FLAGS" CXXFLAGS="$FLAGS" LDFLAGS=-fsanitize=address \
./configure --prefix=/home/john/vips --disable-introspection
$ FLAGS="-O1 -g -fsanitize=thread"
$ FLAGS="$FLAGS -fPIC -pie"
$ FLAGS="$FLAGS -fno-omit-frame-pointer -fno-optimize-sibling-calls"
$ CC=clang CXX=clang++ LD=clang \
CFLAGS="$FLAGS" CXXFLAGS="$FLAGS" \
LDFLAGS="-fsanitize=thread -fPIC -pie" \
./configure --prefix=/home/john/vips --disable-introspection
Build with the GCC auto-vectorizer and diagnostics (or just -O3):
$ FLAGS="-O2 -msse4.2 -ffast-math"
$ FLAGS="$FLAGS -ftree-vectorize -fdump-tree-vect-details"
$ CFLAGS="$FLAGS" CXXFLAGS="$FLAGS" \
./configure --prefix=/home/john/vips --disable-introspection \
--enable-debug=no
Static analysis with:
$ cppcheck --force --enable=style . &> cppcheck.log
# Dependencies
libvips has to have gettext, glib-2.x and libxml-2.0. The build system
needs sh, pkg-config, swig, gtk-doc-tools, automake, gobject-introspection
and gnu make.
# Optional dependencies
If suitable versions are found, libvips will add support for the following
libraries automatically. See `./configure --help` for a set of flags to
control library detection. Packages are generally found with `pkg-config`,
so make sure that is working.
libtiff and libjpeg do not usually use pkg-config so libvips looks for
them in the default path and in $prefix. If you have installed your own
versions of these libraries in a different location, libvips will not see
them. Use switches to libvips configure like:
./configure --prefix=/Users/john/vips \
--with-tiff-includes=/opt/local/include \
--with-tiff-libraries=/opt/local/lib \
--with-jpeg-includes=/opt/local/include \
--with-jpeg-libraries=/opt/local/lib
or perhaps:
CFLAGS="-g -Wall -I/opt/local/include -L/opt/local/lib" \
CXXFLAGS="-g -Wall -I/opt/local/include -L/opt/local/lib" \
./configure --without-python --prefix=/Users/john/vips
to get libvips to see your builds.
## libjpeg
The IJG JPEG library.
## libexif
If available, libvips adds support for EXIF metadata in JPEG files.
## libgsf-1
If available, libvips adds support for creating image pyramids with dzsave.
## libtiff
The TIFF library. It needs to be built with support for JPEG and
ZIP compression. 3.4b037 and later are known to be OK.
## fftw3
If libvips finds this library, it uses it for fourier transforms. It
can also use fftw2, but 3 is faster and more accurate.
## lcms2, lcms
If present, im_icc_import(), _export() and _transform() are available
for transforming images with ICC profiles. If lcms2 is available,
it is used in preference to lcms since it is faster.
## Large files
libvips uses the standard autoconf tests to work out how to support
large files (>2GB) on your system. Any reasonably recent *nix should
be OK.
## libpng
If present, libvips can load and save png files.
## libMagick, or optionally GraphicsMagick
if available, libvips adds support for loading all libMagick supported
image file types (about 80 different formats). Use
`--with-magickpackage` to build against graphicsmagick instead.
## pangoft2
If available, libvips adds support for text rendering. You need the
package pangoft2 in `pkg-config --list-all`.
## orc-0.4
If available, vips will accelerate some operations with this run-time
compiler.
## matio
If available, vips can load images from Matlab save files.
## cfitsio
If available, vips can load FITS images.
## OpenEXR
If available, libvips will directly read (but not write, sadly)
OpenEXR images.
## OpenSlide
If available, libvips can load OpenSlide-supported virtual slide
files: Aperio, Hamamatsu, Leica, MIRAX, Sakura, Trestle, and Ventana.
## swig, python, python-dev
If available, we build the python binding too.
# Disclaimer
No guarantees of performance accompany this software, nor is any
responsibility assumed on the part of the authors. Please read the licence
agreement.