libvips/README.md

320 lines
9.8 KiB
Markdown
Raw Normal View History

2012-06-29 13:20:50 +02:00
# libvips : an image processing library
2007-08-29 18:23:50 +02:00
2018-09-21 18:05:47 +02:00
[![Build Status](https://travis-ci.org/libvips/libvips.svg?branch=master)](https://travis-ci.org/libvips/libvips)
2015-09-30 12:37:42 +02:00
[![Coverity Status](https://scan.coverity.com/projects/6503/badge.svg)](https://scan.coverity.com/projects/jcupitt-libvips)
2018-08-17 18:52:45 +02:00
libvips is a [demand-driven, horizontally
2018-09-21 18:05:47 +02:00
threaded](https://github.com/libvips/libvips/wiki/Why-is-libvips-quick)
2018-08-17 18:52:45 +02:00
image processing library. Compared to similar
libraries, [libvips runs quickly and uses little
2018-09-21 18:05:47 +02:00
memory](https://github.com/libvips/libvips/wiki/Speed-and-memory-use).
2018-08-17 18:52:45 +02:00
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
2019-02-10 06:31:33 +01:00
types](http://libvips.github.io/libvips/API/current/VipsImage.html#VipsBandFormat),
2018-08-17 18:52:45 +02:00
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,
2019-02-10 06:31:33 +01:00
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),
2018-08-17 18:52:45 +02:00
[Python](https://pypi.python.org/pypi/pyvips),
2018-09-21 18:05:47 +02:00
[PHP](https://github.com/libvips/php-vips),
2019-02-10 06:31:33 +01:00
[C# / .NET](https://www.nuget.org/packages/NetVips),
2018-08-17 18:52:45 +02:00
[Go](https://github.com/davidbyttow/govips), and
2018-09-21 18:05:47 +02:00
[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),
2018-08-17 18:52:45 +02:00
[carrierwave-vips](https://github.com/eltiare/carrierwave-vips),
[mediawiki](http://www.mediawiki.org/wiki/Extension:VipsScaler),
[PhotoFlow](https://github.com/aferrero2707/PhotoFlow) and others.
2018-09-21 18:05:47 +02:00
The official libvips GUI is [nip2](https://github.com/libvips/nip2),
2018-08-17 18:52:45 +02:00
a strange combination of a spreadsheet and an photo editor.
2007-08-29 18:23:50 +02:00
2012-06-29 13:36:56 +02:00
There are packages for most unix-like operating systems and binaries for
2011-01-06 15:18:00 +01:00
Windows and OS X.
2008-03-26 17:56:51 +01:00
# Building libvips from a source tarball
2007-08-29 18:23:50 +02:00
We keep pre-baked tarballs of releases on the vips website:
2018-09-21 18:05:47 +02:00
https://github.com/libvips/libvips/releases
Untar, then in the libvips directory you should just be able to do:
2007-08-29 18:23:50 +02:00
$ ./configure
2015-05-05 14:50:43 +02:00
2018-07-07 17:22:17 +02:00
Check the summary at the end of `configure` carefully. libvips must have
`build-essential`, `pkg-config`, `glib2.0-dev`, `libexpat1-dev`.
2015-05-05 14:50:43 +02:00
2018-07-07 17:22:17 +02:00
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.
2015-05-05 14:50:43 +02:00
Once `configure` is looking OK, compile and install with the usual:
$ make
$ sudo make install
2007-08-29 18:23:50 +02:00
2012-06-29 13:36:56 +02:00
By default this will install files to `/usr/local`.
2007-08-29 18:23:50 +02:00
2012-06-29 13:20:50 +02:00
We have detailed guides on the wiki for [building on
2018-09-21 18:05:47 +02:00
Windows](https://github.com/libvips/libvips/wiki/Build-for-Windows) and
[building on OS X](https://github.com/libvips/libvips/wiki/Build-for-macOS).
2018-07-07 17:22:17 +02:00
# Testing
Do a basic test of your build with:
$ make check
2018-07-07 17:22:17 +02:00
Run the libvips test suite with:
$ pytest
Run a specific test with:
$ pytest test/test-suite/test_foreign.py -k test_tiff
2018-07-07 17:22:17 +02:00
2018-08-07 11:47:28 +02:00
You will need to install a variety of Python packages for this, including
2018-07-07 17:22:17 +02:00
pyvips, the libvips Python binding.
2007-08-29 18:23:50 +02:00
2014-11-26 12:07:10 +01:00
# Building libvips from git
2009-08-27 15:07:58 +02:00
Checkout the latest sources with:
2018-09-21 18:05:47 +02:00
$ git clone git://github.com/libvips/libvips.git
2009-08-27 15:07:58 +02:00
Building from git needs more packages, you'll need at least `gtk-doc`
2015-05-05 14:50:43 +02:00
and `gobject-introspection`, see the dependencies section below. For example:
2009-08-27 15:07:58 +02:00
$ brew install gtk-doc
2009-08-27 15:07:58 +02:00
2014-11-26 12:07:10 +01:00
Then build the build system with:
$ ./autogen.sh
2014-11-26 12:07:10 +01:00
Debug build:
$ CFLAGS="-g -Wall" CXXFLAGS="-g -Wall" \
./configure --prefix=/home/john/vips --enable-debug
$ make
$ make install
2013-07-15 23:01:00 +02:00
Leak check:
$ export G_DEBUG=gc-friendly
$ valgrind --suppressions=libvips.supp \
--leak-check=yes \
vips ... > vips-vg.log 2>&1
2013-07-15 23:01:00 +02:00
Memory error debug:
$ valgrind --vgdb=yes --vgdb-error=0 vips ...
2014-01-14 13:21:21 +01:00
valgrind threading check:
$ valgrind --tool=helgrind vips ... > vips-vg.log 2>&1
2014-01-14 13:21:21 +01:00
2013-11-22 11:12:54 +01:00
Clang build:
$ CC=clang CXX=clang++ ./configure --prefix=/home/john/vips
2013-11-22 11:12:54 +01:00
2013-11-22 12:27:29 +01:00
Clang static analysis:
$ scan-build ./configure --disable-introspection --disable-debug
$ scan-build -o scan -v make
$ scan-view scan/2013-11-22-2
2013-11-22 12:27:29 +01:00
2013-11-22 11:12:54 +01:00
Clang dynamic analysis:
2019-03-02 17:23:19 +01:00
$ 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
2013-11-22 11:12:54 +01:00
2013-12-05 15:40:42 +01:00
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
2014-03-20 15:52:06 +01:00
Static analysis with:
$ cppcheck --force --enable=style . &> cppcheck.log
2014-03-20 15:52:06 +01:00
2012-06-29 13:20:50 +02:00
# Dependencies
2007-08-29 18:23:50 +02:00
libvips has to have `glib2.0-dev`. Other dependencies are optional, see below.
2007-08-29 18:23:50 +02:00
2012-06-29 13:20:50 +02:00
# Optional dependencies
2007-08-29 18:23:50 +02:00
2012-06-29 13:20:50 +02:00
If suitable versions are found, libvips will add support for the following
2012-06-29 13:36:56 +02:00
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.
2007-08-29 18:23:50 +02:00
2016-05-09 15:06:44 +02:00
libtiff, giflib and libjpeg do not usually use `pkg-config` so libvips looks for
2015-07-10 13:44:02 +02:00
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:
2007-08-29 18:23:50 +02:00
./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
2008-10-11 23:29:16 +02:00
or perhaps:
CFLAGS="-g -Wall -I/opt/local/include -L/opt/local/lib" \
2019-04-27 12:41:26 +02:00
CXXFLAGS="-g -Wall -I/opt/local/include -L/opt/local/lib" \
./configure --prefix=/Users/john/vips
2007-08-29 18:23:50 +02:00
to get libvips to see your builds.
2007-08-29 18:23:50 +02:00
2015-07-10 13:44:02 +02:00
### libjpeg
2012-06-29 13:20:50 +02:00
2015-07-10 13:44:02 +02:00
The IJG JPEG library. Use the `-turbo` version if you can.
2012-06-29 13:20:50 +02:00
2015-07-10 13:44:02 +02:00
### libexif
2012-06-29 13:20:50 +02:00
2012-06-29 13:36:56 +02:00
If available, libvips adds support for EXIF metadata in JPEG files.
2012-06-29 13:20:50 +02:00
2016-03-08 10:00:57 +01:00
### 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.
2018-04-07 18:36:52 +02:00
### PDFium
If present, libvips will attempt to load PDFs via PDFium. This library must be
2018-10-06 05:31:38 +02:00
packaged by https://github.com/jcupitt/docker-builds/tree/master/pdfium
2018-04-07 18:36:52 +02:00
If PDFium is not detected, libvips will look for poppler-glib instead.
2019-04-27 12:41:26 +02:00
### poppler-glib
2016-03-08 10:00:57 +01:00
2019-04-27 12:41:26 +02:00
The Poppler PDF renderer, with a glib API. If this is not present, vips
will try to load PDFs via imagemagick.
2016-03-08 10:00:57 +01:00
2015-07-10 13:44:02 +02:00
### libgsf-1
2015-07-10 13:44:02 +02:00
If available, libvips adds support for creating image pyramids with `dzsave`.
2015-07-10 13:44:02 +02:00
### libtiff
2012-06-29 13:20:50 +02:00
The TIFF library. It needs to be built with support for JPEG and
ZIP compression. 3.4b037 and later are known to be OK.
2015-07-10 13:44:02 +02:00
### fftw3
2012-06-29 13:20:50 +02:00
2015-07-10 13:44:02 +02:00
If libvips finds this library, it uses it for fourier transforms.
2012-06-29 13:20:50 +02:00
2019-04-27 12:41:26 +02:00
### lcms2
2012-06-29 13:20:50 +02:00
2015-07-10 13:44:02 +02:00
If present, `vips_icc_import()`, `vips_icc_export()` and `vips_icc_transform()`
2019-04-27 12:41:26 +02:00
are available for transforming images with ICC profiles.
2012-06-29 13:20:50 +02:00
2015-07-10 13:44:02 +02:00
### libpng
2012-06-29 13:20:50 +02:00
2012-06-29 13:36:56 +02:00
If present, libvips can load and save png files.
2007-08-29 18:23:50 +02:00
2018-08-07 16:07:38 +02:00
### libimagequant
If present, libvips can write 8-bit palette-ised PNGs.
2015-07-10 13:44:02 +02:00
### ImageMagick, or optionally GraphicsMagick
2007-08-29 18:23:50 +02:00
2015-07-10 13:44:02 +02:00
If available, libvips adds support for loading all libMagick-supported
image file types. Use `--with-magickpackage=GraphicsMagick` to build against
graphicsmagick instead.
2007-08-29 18:23:50 +02:00
2016-05-05 10:14:58 +02:00
Imagemagick 6.9+ needs to have been built with `--with-modules`. Most packaged
IMs are, I think.
2016-05-05 10:14:58 +02:00
2016-05-09 15:06:44 +02:00
If you are going to be using libvips with untrusted images, perhaps in a
2019-04-27 12:41:26 +02:00
web server, for example, you should consider the security implications of
enabling a package with such a large attack surface.
2016-05-09 15:06:44 +02:00
2015-07-10 13:44:02 +02:00
### pangoft2
2007-08-29 18:23:50 +02:00
2012-06-29 13:36:56 +02:00
If available, libvips adds support for text rendering. You need the
package pangoft2 in `pkg-config --list-all`.
2007-08-29 18:23:50 +02:00
2015-07-10 13:44:02 +02:00
### orc-0.4
2007-08-29 18:23:50 +02:00
2012-06-29 13:36:56 +02:00
If available, vips will accelerate some operations with this run-time
compiler.
2007-08-29 18:23:50 +02:00
2015-07-10 13:44:02 +02:00
### matio
2007-08-29 18:23:50 +02:00
2012-06-29 13:36:56 +02:00
If available, vips can load images from Matlab save files.
2007-08-29 18:23:50 +02:00
2015-07-10 13:44:02 +02:00
### cfitsio
2007-08-29 18:23:50 +02:00
2012-06-29 13:36:56 +02:00
If available, vips can load FITS images.
2007-08-29 18:23:50 +02:00
2015-07-10 13:44:02 +02:00
### libwebp
2015-01-26 15:58:49 +01:00
If available, vips can load and save WebP images.
2018-08-07 16:07:38 +02:00
### libniftiio
If available, vips can load and save NIFTI images.
2015-07-10 13:44:02 +02:00
### OpenEXR
2011-01-06 15:18:00 +01:00
2012-06-29 13:36:56 +02:00
If available, libvips will directly read (but not write, sadly)
OpenEXR images.
2011-01-06 15:18:00 +01:00
2015-07-10 13:44:02 +02:00
### OpenSlide
2007-08-29 18:23:50 +02:00
2012-06-29 13:36:56 +02:00
If available, libvips can load OpenSlide-supported virtual slide
files: Aperio, Hamamatsu, Leica, MIRAX, Sakura, Trestle, and Ventana.
2007-08-29 18:23:50 +02:00
2019-04-27 12:41:26 +02:00
### libheif
If available, libvips can load and save HEIC images.
2012-06-29 13:20:50 +02:00
# Disclaimer
2007-08-29 18:23:50 +02:00
2012-06-29 13:20:50 +02:00
No guarantees of performance accompany this software, nor is any
2007-08-29 18:23:50 +02:00
responsibility assumed on the part of the authors. Please read the licence
agreement.