276 lines
9.8 KiB
Markdown
276 lines
9.8 KiB
Markdown
# libvips : an image processing library
|
|
|
|
[](https://travis-ci.org/libvips/libvips)
|
|
[](https://bugs.chromium.org/p/oss-fuzz/issues/list?sort=-opened&can=2&q=proj:libvips)
|
|
[](https://scan.coverity.com/projects/jcupitt-libvips)
|
|
|
|
# Introduction
|
|
|
|
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, HEIC, FITS, Matlab, OpenEXR, PDF, SVG, HDR, PPM / PGM / PFM, 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.
|
|
|
|
# Install
|
|
|
|
There are packages for most Unix-like operating systems, including
|
|
macOS. Check your package manager.
|
|
|
|
There are binaries for Windows in
|
|
[releases](https://github.com/libvips/libvips/releases).
|
|
|
|
The [libvips website](https://libvips.github.io/libvips) has [detailed
|
|
install notes](https://libvips.github.io/libvips/install.html).
|
|
|
|
# Building libvips from a source tarball
|
|
|
|
We keep pre-baked tarballs in
|
|
[releases](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`, `libglib2.0-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`.
|
|
|
|
# Testing
|
|
|
|
Run the test suite with:
|
|
|
|
make check
|
|
|
|
Run a specific test with:
|
|
|
|
pytest test/test-suite/test_foreign.py -k test_tiff
|
|
|
|
# Building libvips from git
|
|
|
|
Clone 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 generate the build system with:
|
|
|
|
./autogen.sh --prefix=/home/john/vips
|
|
|
|
Debug build:
|
|
|
|
CFLAGS="-g -Wall" CXXFLAGS="-g -Wall" \
|
|
./configure --prefix=/home/john/vips --enable-debug
|
|
make
|
|
make install
|
|
|
|
# Dependencies
|
|
|
|
libvips has to have `libglib2.0-dev` and `libexpat1-dev`. Other dependencies
|
|
are optional.
|
|
|
|
## 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.
|
|
|
|
Libraries like giflib and nifti do not use `pkg-config` so libvips will also
|
|
look 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
|
|
|
|
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
|
|
|
|
### 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.
|
|
|
|
### poppler-glib
|
|
|
|
The Poppler PDF renderer, with a glib API. 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
|
|
|
|
If present, `vips_icc_import()`, `vips_icc_export()` and `vips_icc_transform()`
|
|
are available for transforming images with ICC profiles.
|
|
|
|
### 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
|
|
enabling a package with such a large attack surface.
|
|
|
|
### 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.
|
|
|
|
### libheif
|
|
|
|
If available, libvips can load and save HEIC images.
|
|
|
|
# Contributors
|
|
|
|
### Code Contributors
|
|
|
|
This project exists thanks to all the people who contribute.
|
|
|
|
<a href="https://github.com/libvips/libvips/graphs/contributors"><img src="https://opencollective.com/libvips/contributors.svg?width=890&button=false" /></a>
|
|
|
|
### Organizations
|
|
|
|
Support this project with your organization. Your logo will show up here with a link to your website.
|
|
|
|
<a href="https://opencollective.com/libvips/organization/0/website"><img src="https://opencollective.com/libvips/organization/0/avatar.svg"></a>
|
|
<a href="https://opencollective.com/libvips/organization/1/website"><img src="https://opencollective.com/libvips/organization/1/avatar.svg"></a>
|
|
<a href="https://opencollective.com/libvips/organization/2/website"><img src="https://opencollective.com/libvips/organization/2/avatar.svg"></a>
|
|
<a href="https://opencollective.com/libvips/organization/3/website"><img src="https://opencollective.com/libvips/organization/3/avatar.svg"></a>
|
|
<a href="https://opencollective.com/libvips/organization/4/website"><img src="https://opencollective.com/libvips/organization/4/avatar.svg"></a>
|
|
<a href="https://opencollective.com/libvips/organization/5/website"><img src="https://opencollective.com/libvips/organization/5/avatar.svg"></a>
|
|
<a href="https://opencollective.com/libvips/organization/6/website"><img src="https://opencollective.com/libvips/organization/6/avatar.svg"></a>
|
|
<a href="https://opencollective.com/libvips/organization/7/website"><img src="https://opencollective.com/libvips/organization/7/avatar.svg"></a>
|
|
<a href="https://opencollective.com/libvips/organization/8/website"><img src="https://opencollective.com/libvips/organization/8/avatar.svg"></a>
|
|
<a href="https://opencollective.com/libvips/organization/9/website"><img src="https://opencollective.com/libvips/organization/9/avatar.svg"></a>
|