README

libvips 
=======

libvips is an image processing library. It's good for large images and for
colour. 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.

If you have problems, read on.

Building libvips on win32
-------------------------

	http://www.vips.ecs.soton.ac.uk/index.php?title=Build_on_windows

Building libvips 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

Dependencies
============

libvips has to have gettext, glib-2.x and libxml-2.0. The build system needs 
pkg-config and gnu make.

Optional dependencies
---------------------

If suitable versions are found, libvips will add support for these
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

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. 

libz
	If your TIFF library includes ZIP compression, you'll need this too.

videodev.h
	If libvips finds linux/videodev.h, you get support for Linux video 
	grabbing.

fftw3
	If libvips finds this library, it uses it for fourier transforms. It
	can also use fftw2, but 3 is faster and more accurate.

	If the library is not found, libvips falls back to it's own internal
	FFT routines which are slower and less 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.

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

swig
python
python-dev
	if available, we build the python binding too

Disclaimer
----------

Disclaimer: No guarantees of performance accompany this software, nor is any
responsibility assumed on the part of the authors. Please read the licence
agreement.