bae484ba2c
Instead, use the new(er) vips8 C++ interface, and the new(er) python interface in pypi. https://pypi.org/project/pyvips
324 lines
10 KiB
Markdown
324 lines
10 KiB
Markdown
# libvips : an image processing library
|
|
|
|
[![Build Status](https://travis-ci.org/libvips/libvips.svg?branch=master)](https://travis-ci.org/libvips/libvips)
|
|
[![Coverity Status](https://scan.coverity.com/projects/6503/badge.svg)](https://scan.coverity.com/projects/jcupitt-libvips)
|
|
|
|
libvips is a [demand-driven, horizontally
|
|
threaded](https://github.com/libvips/libvips/wiki/Why-is-libvips-quick)
|
|
image processing library. Compared to similar
|
|
libraries, [libvips runs quickly and uses little
|
|
memory](https://github.com/libvips/libvips/wiki/Speed-and-memory-use).
|
|
libvips is licensed under the [LGPL
|
|
2.1+](https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html).
|
|
|
|
It has around [300
|
|
operations](http://libvips.github.io/libvips/API/current/func-list.html)
|
|
covering arithmetic, histograms, convolution, morphological
|
|
operations, frequency filtering, colour, resampling,
|
|
statistics and others. It supports a large range of [numeric
|
|
types](http://libvips.github.io/libvips/API/current/VipsImage.html#VipsBandFormat),
|
|
from 8-bit int to 128-bit complex. Images can have any number of bands.
|
|
It supports a good range of image formats, including JPEG, TIFF, PNG, WebP,
|
|
FITS, Matlab, OpenEXR, PDF, SVG, HDR, PPM, CSV, GIF, Analyze, NIfTI, DeepZoom,
|
|
and OpenSlide. It can also load images via ImageMagick or GraphicsMagick,
|
|
letting it work with formats like DICOM.
|
|
|
|
It comes with bindings for
|
|
[C](http://libvips.github.io/libvips/API/current/using-from-c.html),
|
|
[C++](http://libvips.github.io/libvips/API/current/using-from-cpp.html),
|
|
and the
|
|
[command-line](http://libvips.github.io/libvips/API/current/using-cli.html).
|
|
Full bindings are available for [Ruby](https://rubygems.org/gems/ruby-vips),
|
|
[Python](https://pypi.python.org/pypi/pyvips),
|
|
[PHP](https://github.com/libvips/php-vips),
|
|
[C# / .NET](https://www.nuget.org/packages/NetVips),
|
|
[Go](https://github.com/davidbyttow/govips), and
|
|
[Lua](https://github.com/libvips/lua-vips). libvips
|
|
is used as an image processing engine by [sharp
|
|
(on node.js)](https://www.npmjs.org/package/sharp),
|
|
[bimg](https://github.com/h2non/bimg), [sharp
|
|
for Go](https://github.com/DAddYE/vips), [Ruby on
|
|
Rails](http://edgeguides.rubyonrails.org/active_storage_overview.html),
|
|
[carrierwave-vips](https://github.com/eltiare/carrierwave-vips),
|
|
[mediawiki](http://www.mediawiki.org/wiki/Extension:VipsScaler),
|
|
[PhotoFlow](https://github.com/aferrero2707/PhotoFlow) and others.
|
|
The official libvips GUI is [nip2](https://github.com/libvips/nip2),
|
|
a strange combination of a spreadsheet and an photo editor.
|
|
|
|
There are packages for most unix-like operating systems and binaries for
|
|
Windows and OS X.
|
|
|
|
# Building libvips from a source tarball
|
|
|
|
We keep pre-baked tarballs of releases on the vips website:
|
|
|
|
https://github.com/libvips/libvips/releases
|
|
|
|
Untar, then in the libvips directory you should just be able to do:
|
|
|
|
$ ./configure
|
|
|
|
Check the summary at the end of `configure` carefully. libvips must have
|
|
`build-essential`, `pkg-config`, `glib2.0-dev`, `libexpat1-dev`.
|
|
|
|
You'll need the dev packages for the file format support you want. For basic
|
|
jpeg and tiff support, you'll need `libtiff5-dev`, `libjpeg-turbo8-dev`,
|
|
and `libgsf-1-dev`. See the **Dependencies** section below for a full list
|
|
of the things that libvips can be configured to use.
|
|
|
|
Once `configure` is looking OK, compile and install with the usual:
|
|
|
|
$ make
|
|
$ sudo make install
|
|
|
|
By default this will install files to `/usr/local`.
|
|
|
|
We have detailed guides on the wiki for [building on
|
|
Windows](https://github.com/libvips/libvips/wiki/Build-for-Windows) and
|
|
[building on OS X](https://github.com/libvips/libvips/wiki/Build-for-macOS).
|
|
|
|
# Testing
|
|
|
|
Do a basic test of your build with:
|
|
|
|
$ make check
|
|
|
|
Run the libvips test suite with:
|
|
|
|
$ pytest
|
|
|
|
Run a specific test with:
|
|
|
|
$ pytest test/test-suite/test_foreign.py -k test_tiff
|
|
|
|
You will need to install a variety of Python packages for this, including
|
|
pyvips, the libvips Python binding.
|
|
|
|
# Building libvips from git
|
|
|
|
Checkout the latest sources with:
|
|
|
|
$ git clone git://github.com/libvips/libvips.git
|
|
|
|
Building from git needs more packages, you'll need at least `gtk-doc`
|
|
and `gobject-introspection`, see the dependencies section below. For example:
|
|
|
|
$ brew install gtk-doc
|
|
|
|
Then build the build system with:
|
|
|
|
$ ./autogen.sh
|
|
|
|
Debug build:
|
|
|
|
$ CFLAGS="-g -Wall" CXXFLAGS="-g -Wall" \
|
|
./configure --prefix=/home/john/vips --enable-debug
|
|
$ make
|
|
$ make install
|
|
|
|
Leak check:
|
|
|
|
$ export G_DEBUG=gc-friendly
|
|
$ valgrind --suppressions=libvips.supp \
|
|
--leak-check=yes \
|
|
vips ... > vips-vg.log 2>&1
|
|
|
|
Memory error debug:
|
|
|
|
$ valgrind --vgdb=yes --vgdb-error=0 vips ...
|
|
|
|
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 --disable-debug
|
|
$ scan-build -o scan -v make
|
|
$ scan-view scan/2013-11-22-2
|
|
|
|
Clang dynamic analysis:
|
|
|
|
$ FLAGS="-g -O1 -fno-omit-frame-pointer"
|
|
$ CC=clang CXX=clang++ LD=clang \
|
|
CFLAGS="$FLAGS" CXXFLAGS="$FLAGS" LDFLAGS=-fsanitize=address \
|
|
./configure --prefix=/home/john/vips
|
|
|
|
$ FLAGS="-O1 -g -fsanitize=thread"
|
|
$ FLAGS="$FLAGS -fPIC"
|
|
$ FLAGS="$FLAGS -fno-omit-frame-pointer -fno-optimize-sibling-calls"
|
|
$ CC=clang CXX=clang++ LD=clang \
|
|
CFLAGS="$FLAGS" CXXFLAGS="$FLAGS" \
|
|
LDFLAGS="-fsanitize=thread -fPIC" \
|
|
./configure --prefix=/home/john/vips \
|
|
--without-magick \
|
|
--disable-introspection
|
|
$ G_DEBUG=gc-friendly vips copy ~/pics/k2.jpg x.jpg >& log
|
|
|
|
Build with the GCC auto-vectorizer and diagnostics (or just -O3):
|
|
|
|
$ FLAGS="-O2 -march=native -ffast-math"
|
|
$ FLAGS="$FLAGS -ftree-vectorize -fdump-tree-vect-details"
|
|
$ CFLAGS="$FLAGS" CXXFLAGS="$FLAGS" \
|
|
./configure --prefix=/home/john/vips
|
|
|
|
Static analysis with:
|
|
|
|
$ cppcheck --force --enable=style . &> cppcheck.log
|
|
|
|
# Dependencies
|
|
|
|
libvips has to have `glib2.0-dev`. Other dependencies are optional, see below.
|
|
|
|
# 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, giflib 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-giflib-includes=/opt/local/include \
|
|
--with-giflib-libraries=/opt/local/lib \
|
|
--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 --prefix=/Users/john/vips
|
|
|
|
to get libvips to see your builds.
|
|
|
|
### libjpeg
|
|
|
|
The IJG JPEG library. Use the `-turbo` version if you can.
|
|
|
|
### libexif
|
|
|
|
If available, libvips adds support for EXIF metadata in JPEG files.
|
|
|
|
### giflib
|
|
|
|
The standard gif loader. If this is not present, vips will try to load gifs
|
|
via imagemagick instead.
|
|
|
|
### librsvg
|
|
|
|
The usual SVG loader. If this is not present, vips will try to load SVGs
|
|
via imagemagick instead.
|
|
|
|
### PDFium
|
|
|
|
If present, libvips will attempt to load PDFs via PDFium. This library must be
|
|
packaged by https://github.com/jcupitt/docker-builds/tree/master/pdfium
|
|
|
|
If PDFium is not detected, libvips will look for poppler-glib instead.
|
|
|
|
### libpoppler
|
|
|
|
The usual PDF loader. If this is not present, vips will try to load PDFs
|
|
via imagemagick.
|
|
|
|
### 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.
|
|
|
|
### lcms2, lcms
|
|
|
|
If present, `vips_icc_import()`, `vips_icc_export()` and `vips_icc_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 unix should
|
|
be OK.
|
|
|
|
### libpng
|
|
|
|
If present, libvips can load and save png files.
|
|
|
|
### libimagequant
|
|
|
|
If present, libvips can write 8-bit palette-ised PNGs.
|
|
|
|
### ImageMagick, or optionally GraphicsMagick
|
|
|
|
If available, libvips adds support for loading all libMagick-supported
|
|
image file types. Use `--with-magickpackage=GraphicsMagick` to build against
|
|
graphicsmagick instead.
|
|
|
|
Imagemagick 6.9+ needs to have been built with `--with-modules`. Most packaged
|
|
IMs are, I think.
|
|
|
|
If you are going to be using libvips with untrusted images, perhaps in a
|
|
web-server, for example, you should consider the security implications of
|
|
using a package with such a large attack surface. You might prefer not to
|
|
enable Magick support.
|
|
|
|
### 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.
|
|
|
|
### libwebp
|
|
|
|
If available, vips can load and save WebP images.
|
|
|
|
### libniftiio
|
|
|
|
If available, vips can load and save NIFTI 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.
|
|
|
|
# Disclaimer
|
|
|
|
No guarantees of performance accompany this software, nor is any
|
|
responsibility assumed on the part of the authors. Please read the licence
|
|
agreement.
|
|
|