libvips : an image processing library

This branch

Is for experiemtning with libspng.

Notes

Build libspng:

cd libspng
meson build --prefix=/home/john/vips --libdir=/home/john/vips/lib \
    --buildtype=release
cd build 
ninja
ninja install

Installs spng.pc.

Sample code:

https://github.com/randy408/libspng/blob/master/examples/example.c

libspng benchmark:

$ time vips avg wtc.png
117.065766

real	0m2.972s
user	0m3.376s
sys	0m0.197s

And for libpng:

$ time vips avg wtc.png
117.065766

real	0m3.816s
user	0m4.177s
sys	0m0.221s

Introduction

libvips is a demand-driven, horizontally threaded image processing library. Compared to similar libraries, libvips runs quickly and uses little memory. libvips is licensed under the LGPL 2.1+.

It has around 300 operations covering arithmetic, histograms, convolution, morphological operations, frequency filtering, colour, resampling, statistics and others. It supports a large range of numeric types, 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, C++, and the command-line. Full bindings are available for Ruby, Python, PHP, C# / .NET, Go, and Lua. libvips is used as an image processing engine by sharp (on node.js), bimg, sharp for Go, Ruby on Rails, carrierwave-vips, mediawiki, PhotoFlow and others. The official libvips GUI is 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.

The libvips website has detailed install notes.

Building libvips from a source tarball

We keep pre-baked tarballs in 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.

Organizations

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